CN116400111A - Double-sound signal source - Google Patents

Double-sound signal source Download PDF

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Publication number
CN116400111A
CN116400111A CN202310666466.4A CN202310666466A CN116400111A CN 116400111 A CN116400111 A CN 116400111A CN 202310666466 A CN202310666466 A CN 202310666466A CN 116400111 A CN116400111 A CN 116400111A
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signal
frequency
signal source
output
throw switch
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CN116400111B (en
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冯东成
杨胜领
程军强
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Zhongxing Lianhua Technology Beijing Co ltd
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Zhongxing Lianhua Technology Beijing Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/15—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors
    • H03K5/15013—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors with more than two outputs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

The invention provides a dual-tone signal source, and belongs to the technical field of circuits. Wherein, this dual tone signal source includes: the device comprises a control module, a reference module, a first signal source, a second signal source and a combiner; the first signal source is used for outputting a first single-tone signal according to the first target frequency, the first target phase and the first target amplitude input by the control module by taking the reference signal input by the reference module as a benchmark; the second signal source is used for outputting a second single-tone signal according to a second target frequency, a second target phase and a second target amplitude which are input by the control module by taking the reference signal input by the reference module as a benchmark; and the combiner is used for combining the first single-tone signal and the second single-tone signal and outputting a double-tone signal. According to the dual-tone signal source provided by the invention, the frequency, the amplitude, the phase and the dual-peak distance of the signals can be adjusted randomly through the first signal source and the second signal source, so that a larger dual-peak distance can be realized, and the dual-peak distance of the dual-tone signals can be improved.

Description

Double-sound signal source
Technical Field
The invention relates to the technical field of circuits, in particular to a double-tone signal source.
Background
A two-tone radio frequency signal (may be referred to as a "two-tone signal") is composed of two single-tone radio frequency signals (may be referred to as "single-tone signals"), as shown in fig. 1.
In the communications industry, binaural signals are commonly used to test nonlinear distortion of amplifiers or receivers and other scenarios where multitone signal testing is applied. A clean two-tone signal enters the amplifier and intermodulation signals are generated on both sides of the output two-tone signal due to the nonlinearity of the amplifier. According to the amplitude of the intermodulation signal and the double-tone signal, an Output Third-order intermodulation-order Intercept Point (OIP 3) can be calculated to measure the linearity of the amplifier.
Currently, there are few instruments that exclusively generate a binaural signal for measurement. In testing amplifier linearity, a dual tone signal is typically generated by mixing a baseband signal with a carrier wave using a vector signal source. The principle of generating a double-tone signal based on a vector signal source is that a baseband signal and a single carrier signal are mixed by a mixer, upper and lower sidebands of a modulation signal form the double-tone signal, and the double-tone signal generated by the method has at least the following defects:
firstly, carrier frequency leakage always exists at the radio frequency end of the mixer, so that local oscillation leakage exists in the center of the output frequency of the double-tone signal, and the spectral purity of the output signal is affected.
Secondly, many intermodulation products are generated after the baseband signal is mixed with the carrier, and these components cannot be filtered out and also affect the spectral purity of the output signal. In a linearity test scenario, these anomalies can affect the results of the test.
Thirdly, the baseband signal generator cannot generate signals with large bandwidth, the signals are limited by the broadband of the baseband signals, the double peak distance of the double tone signals generated based on the method cannot be wider, and special test scenes cannot be met.
In summary, the existing method for generating the dual-tone signal has the defects of limited dual-peak interval, poor spectrum purity and the like of the generated dual-tone signal.
Disclosure of Invention
The invention provides a double-tone signal source which is used for solving the defect of limited double-peak interval of double-tone signals generated in the prior art and realizing the generation of double-tone signals with ultra-wide bandwidth.
The invention provides a dual-tone signal source, comprising: the device comprises a control module, a reference module, a first signal source, a second signal source and a combiner;
the control module is respectively connected with the control end of the first signal source and the control end of the second signal source; the reference module is respectively connected with the input end of the first signal source and the input end of the second signal source; the combiner is respectively connected with the output end of the first signal source and the output end of the second signal source;
The first signal source is used for outputting a first single-tone signal according to a first target frequency, a first target phase and a first target amplitude input by the control module by taking the reference signal input by the reference module as a benchmark;
the second signal source is configured to output a second monophonic signal according to a second target frequency, a second target phase and a second target amplitude input by the control module, with the reference signal input by the reference module as a reference;
and the combiner is used for combining the first single-tone signal and the second single-tone signal and outputting a double-tone signal.
According to the present invention, there is provided a dual-tone signal source, the first signal source or the second signal source, including: the frequency divider comprises a first control unit, a frequency synthesizer unit, a frequency divider, a frequency multiplier and a first single-pole double-throw switch;
the first control unit is respectively connected with the frequency synthesizer unit, the frequency divider and the frequency multiplier; the first control unit is connected with the control end of the first signal source;
the frequency synthesizer unit is connected with the reference end of the first signal source; the output end of the frequency synthesizer unit is connected with the input end of the frequency divider; the frequency synthesizer is used for outputting a first signal by taking the reference signal input by the reference module as a benchmark;
The first output end of the frequency divider is connected with the first input end of the first single-pole double-throw switch; the second output end of the frequency divider is connected with the input end of the frequency multiplier;
the frequency divider is used for performing frequency division processing on the first signal, outputting a second signal to a first input end of the first single-pole double-throw switch or outputting a third signal to the frequency multiplier; the frequency of the second signal is less than half of the lower limit of the frequency range of the first signal; the frequency range of the third signal is from half of the lower limit of the frequency range of the first signal to the first frequency;
the first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch; the second output end of the frequency multiplier is connected with the second input end of the first single-pole double-throw switch;
the frequency multiplier is used for performing frequency multiplication processing on the third signal, outputting a fourth signal to the first input end of the first single-pole double-throw switch or outputting a fifth signal to the second input end of the first single-pole double-throw switch; the frequency range of the fourth signal is from half of the lower limit of the frequency range of the first signal to a second frequency; the frequency range of the fifth signal is the second frequency to the third frequency.
According to the dual-tone signal source provided by the invention, the first signal source or the second signal source further comprises: the first detector, the second detector and the ALC control module are connected with the first control unit;
the first output end of the frequency divider is connected with the first input end of the first single-pole double-throw switch through the first detector;
the first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch through the first detector; the second output end of the frequency multiplier is connected with the second input end of the first single-pole double-throw switch through the second detector;
the ALC control module is used for adjusting the signal output power of the frequency divider or the frequency multiplier based on the output of the first detector under the control of the first control unit, and adjusting the signal output power of the frequency multiplier based on the output of the second detector under the control of the first control unit.
According to the double-sound signal source provided by the invention, the first output end of the frequency divider is connected with the first input end of the first single-pole double-throw switch through the first harmonic filter bank and the second harmonic filter bank;
The first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch through the second harmonic filter bank.
According to the dual-tone signal source provided by the invention, the frequency synthesizer is used for carrying out phase adjustment on the first signal.
According to the dual-tone signal source provided by the invention, the frequency divider is further used for performing gain control on the second signal.
According to the dual-tone signal source provided by the invention, the frequency multiplier is further used for performing gain control on the fourth signal and the fifth signal.
According to the double-sound signal source provided by the invention, the first signal source is connected with the combiner through the second single-pole double-throw switch; the second signal source is connected with the combiner through a third single-pole double-throw switch.
According to the dual-tone signal source provided by the invention, the combiner is a passive power divider.
According to the dual-tone signal source provided by the invention, the passive power divider is a resistive passive power divider.
According to the dual-tone signal source provided by the invention, the frequency, the amplitude, the phase and the bimodal spacing of the signals can be independently adjusted through the first signal source and the second signal source. The double-tone signal source can realize larger double-peak spacing and can improve the double-peak spacing of double-tone signals. And the frequency, amplitude and phase of each single-tone signal can be independently adjusted, so that more test scenes can be met, and the application range is wider.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art binaural signal;
FIG. 2 is a schematic diagram of a dual-tone signal source according to the present invention;
fig. 3 is a schematic structural diagram of a first signal source or a second signal source in a dual-tone signal source according to the present invention;
FIG. 4 is a control schematic block diagram of an ALC control module in a dual-tone signal source provided by the present invention;
FIG. 5 is a schematic diagram of a closed loop calibration mode of an ALC control module in a dual tone signal source provided by the present invention;
fig. 6 is a second schematic diagram of a dual-tone signal source according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "length", "width", "height", "upper", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and not order.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
The following describes a dual tone signal source provided by the present invention with reference to fig. 2 to 6.
Fig. 2 is a schematic structural diagram of a dual-tone signal source according to the present invention. As shown in fig. 2, the dual tone signal source includes: a control module 201, a reference module 202, a first signal source 203, a second signal source 204 and a combiner 205.
Specifically, the dual-tone signal source may include two signal sources (i.e., a first signal source 203 and a second signal source 204) and one combiner (i.e., a combiner 205).
The control module 201 may be used to control the reference module 202, the first signal source 203 and the second signal source 204.
Alternatively, the control module 201 may be at least one of programmable read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable programmable read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), programmable array logic (Programmable Array Logic, PAL), general-purpose array logic (Generic Array Logic, GAL), complex programmable logic device CPLD (Complex Programmable Logic Device), erasable programmable logic device (Erasable Programmable Logic Device, EPLD), field programmable logic array (Field Programmable Logic Array, FPLA), field programmable gate array (Field Programmable Gate Array, FPGA), programmable system-on-chip (System On Programmable Chip, SOPC), programmable In-system (In-System Programming, ISP) device, and the like.
Optionally, the user may input parameters of the two-tone signal to be generated into the control module 201 according to the requirement, so that the first signal source 203 and the second signal source 204 may respectively generate the single-tone signals that may form the two-tone signal under the control of the control module 201, and the combiner 205 may combine the two single-tone signals and output the two-tone signal.
The parameters of the two-tone signal include parameters of two single-tone signals constituting the two-tone signal. Parameters of each tone signal may include phase, amplitude, and frequency. The amplitude may be indicated directly using an amplitude value or may be indicated using a power value.
The two tone signals may include a first tone signal and a second tone signal. The parameters of the first tone signal may include a first target phase, a first target amplitude, and a first target frequency. The parameters of the second tone signal may include a second target phase, a second target amplitude, and a second target frequency.
The first target frequency is different from the second target frequency. The first target phase may be the same as or different from the second target phase. The first target amplitude may be the same as or different from the second target amplitude.
The control module 201 is respectively connected with the control end of the first signal source 203 and the control end of the second signal source 204; the reference module 202 is connected with the input end of the first signal source 203 and the input end of the second signal source 204 respectively; the combiner 205 is connected to the output of the first signal source 203 and the output of the second signal source 204, respectively.
Specifically, the control module 201 may be electrically connected to a control terminal of the first signal source 203 to control the first signal source 203.
The control module 201 may also be electrically connected to a control terminal of the second signal source 204 to control the second signal source 204.
Optionally, the control module 201 may also be electrically connected to a control terminal of the reference module 202 to control the reference module 202.
Alternatively, the reference module 202 may output the reference signal based on parameters input by the control module 201.
The reference module 202 serves as a common reference source for the first signal source 203 and the second signal source 204, providing reference signals to the first signal source 203 and the second signal source 204.
Alternatively, the reference signal may be a radio frequency signal having a specific frequency.
The reference module 202 may be electrically connected to an input of the first signal source 203 to input a reference signal to the first signal source 203.
The reference module 202 may be electrically connected to an input of the second signal source 204 to input a reference signal to the second signal source 204.
The combiner 205 may be electrically connected to the output end of the first signal source 203, and the combiner 205 may also be connected to the output end of the second signal source 204, so that the combiner 205 may perform a combining process on the single-tone signal output by the output end of the first signal source 203 and the single-tone signal output by the output end of the second signal source 204, to generate a dual-tone signal.
The first signal source 203 is configured to output a first single-tone signal according to a first target frequency, a first target phase, and a first target amplitude input by the control module 201, with reference to the reference signal input by the reference module 202.
Specifically, the first signal source 203 may perform frequency conversion processing on the reference signal with reference signal input by the reference module 202 as a reference, to obtain a single-tone signal with a frequency being the first target frequency.
Optionally, the first signal source 203 may further perform phase adjustment on the first single-tone signal obtained after the frequency conversion processing based on the first target phase, so that the phase of the first single-tone signal finally output by the first signal source 203 is the first target phase.
Optionally, while the first signal source 203 performs frequency conversion processing on the reference signal, the first signal source 203 may further perform gain control on the first single-tone signal based on the first target amplitude, and adjust the amplitude of the first single-tone signal so that the amplitude of the first single-tone signal finally output by the first signal source 203 is the first target amplitude.
The second signal source 204 is configured to output a second single-tone signal according to the second target frequency, the second target phase, and the second target amplitude input by the control module 201, with reference to the reference signal input by the reference module 202.
Specifically, the second signal source 204 may perform frequency conversion processing on the reference signal with reference signal input by the reference module 202 as a reference, to obtain a single-tone signal with a frequency being the second target frequency.
Optionally, the second signal source 204 may further perform phase adjustment on the second single-tone signal obtained after the frequency conversion processing based on the second target phase, so that the phase of the second single-tone signal finally output by the second signal source 204 is the second target phase.
Optionally, while the second signal source 204 performs frequency conversion processing on the reference signal, the second signal source 204 may further perform gain control on the second single-tone signal based on the second target amplitude, and adjust the amplitude of the second single-tone signal so that the amplitude of the second single-tone signal finally output by the second signal source 204 is the second target amplitude.
And the combiner 205 is configured to perform a combining process on the first single-tone signal and the second single-tone signal, and output a dual-tone signal.
Specifically, the combiner 205 may perform a combining process on the first single-tone signal and the second single-tone signal, and output a dual-tone signal that meets the requirement.
It should be noted that, in the embodiment of the present invention, the dual-tone signal source includes two channels for generating signals, which are the first signal source 203 and the second signal source 204, respectively. Each channel is capable of individually adjusting the frequency, amplitude and phase of the signal. Because the frequencies of the signals of the two channels can be independently and randomly regulated, and no limit exists between the two channels, larger double peak spacing can be realized, and the generated double-tone signals can have ultra-wide bandwidth. In addition, the signals of the two channels are generated by the same reference source, so that the phases of the radio frequency signals of the two channels are related and can be kept stable for a long time.
According to the embodiment of the invention, the frequency, the amplitude, the phase and the bimodal spacing of the signals can be independently adjusted through the first signal source and the second signal source. The double-tone signal source can realize larger double-peak spacing and can improve the double-peak spacing of double-tone signals. And the frequency, amplitude and phase of each single-tone signal can be independently adjusted, so that more test scenes can be met, and the application range is wider.
Fig. 3 is a schematic structural diagram of a first signal source or a second signal source in a dual-tone signal source according to the present invention. Based on the foregoing content of any of the foregoing embodiments, as shown in fig. 2, the first signal source 203 or the second signal source 204 includes: a first control unit 301, a frequency synthesizer unit 302, a frequency divider 303, a frequency multiplier 304 and a first single pole double throw switch 305.
Specifically, the first signal source 203 may output a first mono signal having an ultra wide bandwidth in a frequency range. The first single-tone signal may be a microwave radio frequency signal with a frequency range of 0.01-30 ghz or a millimeter wave band covering a frequency range of 30-40 ghz, for example.
The first control unit 301 is respectively connected with the frequency synthesizer 302, the frequency divider 303 and the frequency multiplier 304; the first control unit 301 is connected to a control terminal of the first signal source 203.
Specifically, the first control unit 301 may be electrically connected to the frequency synthesizer 302, the frequency divider 303, the frequency multiplier 304, and the first single-pole double-throw switch 305 to control the frequency synthesizer 302, the frequency divider 303, the frequency multiplier 304, and the first single-pole double-throw switch 305.
The first control unit 301 may further be connected to a control terminal of the first signal source 203, so as to receive the first target frequency, the first target phase and the first target amplitude sent by the control module 201.
The first control unit 301 may control the frequency synthesizer 302, the frequency divider 303, the frequency multiplier 304, and the first single pole double throw switch 305 based on the first target frequency, the first target phase, and the first target amplitude.
Alternatively, the first control unit 301 may be at least one of a programmable read-Only Memory (Programmable Read-Only Memory, PROM), an erasable programmable read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable programmable read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a programmable array logic (Programmable Array Logic, PAL), a general-purpose array logic (Generic Array Logic, GAL), a complex programmable logic device CPLD (Complex Programmable Logic Device), an erasable programmable logic device (Erasable Programmable Logic Device, EPLD), a field programmable logic array (Field Programmable Logic Array, FPLA), a field programmable gate array (Field Programmable Gate Array, FPGA), a programmable system-on-chip (System On Programmable Chip, SOPC), a system-programmable (In-System Programming, ISP) device, and the like.
The frequency synthesis unit 302 is connected with a reference end of the first signal source 203; the output end of the frequency synthesizer unit 302 is connected with the input end of the frequency divider 303; the frequency synthesizer 302 is configured to output a first signal based on the reference signal input by the reference module 202.
Specifically, an input of the frequency synthesizer 302 may be electrically connected to a reference of the first signal source 203 to receive a reference signal.
The frequency synthesizer 302 performs frequency conversion processing on the reference signal with reference to the reference signal, and outputs a first signal within a certain frequency bandwidth. The frequency of the first signal may be higher than the frequency of the reference signal. The frequency range that the frequency synthesis unit 302 can output is the frequency range of the first signal. The frequency of the first signal output by the frequency synthesis unit 302 belongs to this frequency range.
An output of the frequency synthesis unit 302 may be electrically connected to an input of the frequency divider 303, and output a first signal to the frequency divider 303.
A first output of the frequency divider 303 is connected to a first input of a first single pole double throw switch 305; a second output of the frequency divider 303 is connected to an input of the frequency multiplier 304.
A frequency divider 303, configured to perform frequency division processing on the first signal, output a second signal to a first input terminal of the first single-pole double-throw switch 305, or output a third signal to the frequency multiplier 304; the frequency of the second signal is less than half of the lower limit of the frequency range of the first signal; the frequency range of the third signal is from half of the lower limit of the frequency range of the first signal to the first frequency.
Specifically, the frequency divider 303 may divide the first signal according to the first target frequency, and output the second signal or the third signal.
Alternatively, in the case where the first target frequency belongs to the frequency range of the second signal, the frequency divider 303 may output the second signal; in the case where the first target frequency does not belong to the frequency range of the second signal, the frequency divider 303 may output the third signal.
A first output of the frequency divider 303 may be electrically connected to a first input of the first single pole double throw switch 305 to output a second signal to the first input of the first single pole double throw switch 305 if the first target frequency falls within a frequency range of the second signal.
A second output of the frequency divider 303 may be electrically connected to an input of the frequency multiplier 304 to output a third signal to the frequency multiplier 304 in case the first target frequency does not belong to the frequency range of the second signal.
Alternatively, the frequency range of the second signal may be 10MHz to half of the lower limit of the frequency range of the first signal.
Alternatively, the frequency range of the third signal may be half of the lower limit of the frequency range of the first signal to the first frequency. Alternatively, the first frequency may be the upper limit of the frequency range of the first signal.
A first output of the frequency multiplier 304 is connected to a first input of a first single pole double throw switch 305; a second output of the frequency multiplier 304 is connected to a second input of the first single pole double throw switch 305.
A frequency multiplier 304, configured to perform frequency multiplication processing on the third signal, and output a fourth signal to the first input terminal of the first single-pole double-throw switch 305 or output a fifth signal to the second input terminal of the first single-pole double-throw switch 305; the frequency range of the fourth signal is from half of the lower limit of the frequency range of the first signal to the second frequency; the frequency range of the fifth signal is from the second frequency to the third frequency.
Specifically, the frequency multiplier 304 may perform frequency multiplication processing on the third signal according to the first target frequency, and output the fourth signal or the fifth signal.
Alternatively, in the case where the first target frequency belongs to the frequency range of the fourth signal, the frequency multiplier 304 may output the fourth signal; in the case where the first target frequency belongs to the frequency range of the fifth signal, the frequency multiplier 304 may output the fifth signal.
A first output of the frequency multiplier 304 may be electrically connected to a first input of the first single-pole double-throw switch 305 to output a fourth signal to the first input of the first single-pole double-throw switch 305 if the first target frequency falls within a frequency range of the fourth signal.
A second output of the frequency multiplier 304 may be electrically connected to a second input of the first single-pole double-throw switch 305 to output a fifth signal to the second input of the first single-pole double-throw switch 305 if the first target frequency falls within a frequency range of the fifth signal.
Alternatively, the frequency range of the fourth signal may be half of the lower limit of the frequency range of the first signal to the second frequency. Alternatively, the second frequency may be twice the upper limit of the frequency range of the first signal.
Alternatively, the frequency range of the fifth signal may be from the second frequency to the third frequency. Alternatively, the third frequency may be an upper limit of a frequency range that the first signal source 203 may output.
The first control unit 301 may control the first single pole double throw switch 305 according to the first target frequency such that the first single pole double throw switch 305 has a first end or a second end in communication with an output of the first single pole double throw switch 305.
In the case that the first target frequency falls within the first frequency range, the first control unit 301 may control the first end of the first single pole double throw switch 305 to communicate with the output end of the first single pole double throw switch 305, thereby outputting the second signal as the first single tone signal or outputting the fourth signal as the first single tone signal; in the case where the first target frequency falls within the second frequency range, the first control unit 301 may control the second terminal of the first single pole double throw switch 305 to communicate with the output terminal of the first single pole double throw switch 305, thereby outputting the fifth signal as the first single tone signal.
The first frequency range may be 10MHz to the second frequency, and the second frequency range may be the second frequency to the third frequency.
Alternatively, the first output of the frequency divider 303 may be connected to the first input of the first single pole double throw switch 305 sequentially through an amplifier and a first harmonic filter bank to improve the spectral purity of the two-tone signal.
The operating frequency range of the first harmonic filter bank may be 10MHz to half of the lower limit of the frequency range of the first signal. The first harmonic filter bank may include a plurality of harmonic filters.
Optionally, the first output of the frequency multiplier 304 may be connected to the first input of the first single pole double throw switch 305 through a second harmonic filter bank to improve the spectral purity of the double tone signal.
The operating frequency range of the second harmonic filter bank may be 10MHz to half of the lower limit of the frequency range of the first signal and half of the lower limit of the frequency range of the first signal to the second frequency. The second harmonic filter bank may include a plurality of harmonic filters.
Alternatively, the first harmonic filter bank may be connected to a first input of the first single pole double throw switch 305 through a second harmonic filter bank.
Alternatively, the output of the first single pole double throw switch 305 may be connected to the output of the first signal source 203 through an attenuator.
The type of attenuator may be determined according to actual needs. The embodiment of the present invention is not particularly limited as to the type of attenuator. Illustratively, the attenuator may be a digital step attenuator or a programmable step attenuator, etc.
It should be noted that the internal structures of the first signal source 203 and the second signal source 204 may be the same or different. In the case that the internal structure of the second signal source 204 is the same as that of the first signal source 203, the structure of the second signal source 204 may be referred to the foregoing embodiment describing the structure of the first signal source 203, which is not repeated herein. The process of outputting the second signal from the second signal source 204 is similar to the process of outputting the first signal from the first signal source 203, and will not be described herein.
According to the embodiment of the invention, the frequency synthesizer unit, the frequency divider and the frequency multiplier are matched under the control of the first control unit, so that the frequency of the signal can be independently regulated, the first signal source and the second signal source can output single-tone signals in a wider frequency range, and therefore, the double-peak interval of the double-tone signals is larger, and the generated double-tone signals can have ultra-wide bandwidth. And the frequency of each single-tone signal can be independently adjusted, so that more test scenes can be met, and the application range is wider.
Based on the foregoing content of any one of the foregoing embodiments, the first signal source 203 or the second signal source 204 further includes: a first detector 306, a second detector 308, and an ALC control module 307 connected to the first control unit 301; a first output of the frequency divider 303 is connected to a first input of a first single pole double throw switch 305 via a first detector 306.
Specifically, the first signal source 203 may further include a first detector 306, a second detector 308, and an ALC control module 307.ALC (Automatic Level Control) refers to automatic level control.
The ALC control module 307 may be configured to perform automatic level control to implement power amplitude stabilization of the first single-tone signal output by the first signal source.
The ALC control module 307 may be electrically connected to the first control unit 301, so as to perform automatic level control according to the first target amplitude, so as to stabilize the power of the first single-tone signal output by the first signal source.
Alternatively, a first output of the frequency divider 303 may be electrically connected to a first input of the first single pole double throw switch 305 via a first detector 306.
Alternatively, the first output of the frequency divider 303 may be electrically connected to the first input of the first single pole double throw switch 305 via an amplifier, a first harmonic filter bank and a first detector 306 in sequence.
Alternatively, the first output of the frequency divider 303 may be electrically connected to a first input of the first single pole double throw switch 305 via an amplifier, a first harmonic filter bank, a second harmonic filter bank, and a first detector 306 in sequence.
Alternatively, a first output of the frequency multiplier 304 and a first input of the first single pole double throw switch 305 may be electrically connected through a first detector 306.
Alternatively, the first output of the frequency multiplier 304 may be electrically connected to a first input of a first single pole double throw switch 305 via a second harmonic filter bank and a first detector 306 in sequence.
The frequency of the signal detectable by the first detector 306 may range from 10MHz to the second frequency, so that the detection voltage of the second signal or the fourth signal may be obtained.
The first detector 306 may be electrically connected to the ALC control module 307, and the detected voltage obtained by the first detector 306 may be output to the ALC control module 307.
A first output end of the frequency multiplier 304 is connected with a first input end of a first single-pole double-throw switch 305 through a first detector 306; a second output terminal of the frequency multiplier 304 is connected to a second terminal of the first single pole double throw switch 305 through a second detector 308.
Specifically, a first output terminal of the frequency multiplier 304 is connected to a first input terminal of the first single-pole double-throw switch 305 through a first detector 306; a second output terminal of the frequency multiplier 304 is connected to a second terminal of the first single pole double throw switch 305 through a second detector 308.
The ALC control module 307 is configured to adjust the signal output power of the frequency divider 303 or the frequency multiplier 304 based on the output of the first detector 306 under the control of the first control unit 301, and adjust the signal output power of the frequency multiplier 304 based on the output of the second detector 308 under the control of the first control unit 301.
Specifically, the output of the first detector 306 is the detected voltage of the signal input to the first input of the first single pole double throw switch 305.
The ALC control module 307 may adjust the signal output power of the frequency divider 303 or the frequency multiplier 304 based on the output of the first detector 306 and the first target amplitude under the control of the first control unit 301, so as to implement power amplitude stabilization of the first tone signal.
In the case where the frequency divider 303 outputs the second signal, the detected voltage obtained by the first detector 306 is the voltage of the second signal, and the ALC control module 307 may adjust the signal output power of the frequency divider 303 based on the output of the first detector 306 and the first target amplitude under the control of the first control unit 301.
In the case where the fourth signal is output from the frequency multiplier 304, the detected voltage obtained by the first detector 306 is the voltage of the fourth signal, and the ALC control module 307 may adjust the signal output power of the frequency multiplier 304 based on the output of the first detector 306 and the first target amplitude under the control of the first control unit 301.
The output of the second detector 308 is the detected voltage of the signal input to the second input of the first single pole double throw switch 305.
The ALC control module 307 may adjust the signal output power of the frequency multiplier 304 based on the output of the first detector 306 and the first target amplitude under the control of the first control unit 301, so as to implement power amplitude stabilization of the first mono signal.
In the case where the frequency multiplier 304 outputs the fifth signal, the detected voltage obtained by the second detector 308 is the voltage of the fifth signal, and the ALC control module 307 may adjust the signal output power of the frequency multiplier 304 based on the output of the second detector 308 and the first target amplitude under the control of the first control unit 301.
According to the embodiment of the invention, the ALC control module is used for controlling the signal output power of the signal source, so that the output power of the signal source can maintain higher stability, the stability of the output power of the dual-tone signal can be improved, and the signal agility requirement can be met.
Based on the foregoing in any of the embodiments, the frequency synthesizer 302 is configured to perform phase adjustment on the first signal.
Specifically, the frequency synthesizer 302 may have a phase adjusting function built in, so that the phase of the first signal may be adjusted and controlled, and thus the phase of the first single-tone signal may be adjusted.
According to the embodiment of the invention, the phase of the first signal is adjusted through the frequency synthesizer unit, so that the phase of each single-tone signal can be independently adjusted, more test scenes can be met, and the application range is wider.
Based on the foregoing in any of the embodiments, the frequency divider 303 is further configured to gain control the second signal.
Specifically, the frequency divider 303 may have a gain control function for the third frequency range built therein, so that adjustment and control of the amplitude of the second signal may be achieved, thereby adjusting the amplitude of the first mono signal. Wherein the third frequency range may be from 10MHz to half of the lower limit of the frequency range of the first signal.
It will be appreciated that adjusting the amplitude of the signal, i.e. adjusting the power of the signal accordingly.
According to the embodiment of the invention, the second signal is subjected to gain control through the frequency divider, so that the amplitude of each single-tone signal can be independently regulated, more test scenes can be met, and the application range is wider.
Based on the foregoing in any of the embodiments, the frequency multiplier 304 is further configured to perform gain control on the fourth signal and the fifth signal.
Specifically, the frequency multiplier 304 may have a gain control function for the fourth frequency range built therein, so that the amplitude of the fourth signal and the fifth signal may be adjusted and controlled, thereby adjusting the amplitude of the first single-tone signal. Wherein the fourth frequency range may be half of the lower limit of the frequency range of the first signal to the third frequency.
According to the embodiment of the invention, the fourth signal and the fifth signal are subjected to gain control through the frequency multiplier, so that the amplitude of each single-tone signal can be independently regulated, more test scenes can be met, and the application range is wider.
Fig. 4 is a control schematic block diagram of an ALC control module in a dual-tone signal source according to the present invention. In some embodiments, the control principles of the ALC control module 307 may be as shown in FIG. 4.
The ALC control module 307 may process the detected voltage collected by the detector to generate a gain control voltage, and send the gain control voltage to a frequency divider or a frequency multiplier to adjust the signal output power. The addition of the ALC control module 307 can enable the output power of the signal source to maintain higher stability.
The operation modes of the ALC control module 307 may include: a closed loop calibration mode, a closed loop operation mode, an open loop calibration mode, and an open loop operation mode. The four modes of operation are described in sequence below.
In the closed loop calibration mode, the analog switch S1 in the ALC control module 307 is open and the analog switches S2, S3 are closed.
FIG. 5 is a schematic diagram of a closed loop calibration mode of an ALC control module in a dual tone signal source according to the present invention. As shown in fig. 5, in the closed loop calibration mode, the upper computer is connected to a power meter, and the power meter is connected to a dual-tone signal source, which is also connected to the upper computer. The upper computer can be a PC (personal computer ) or an industrial personal computer, etc. The host computer may be provided with a calibration program. In closed loop calibration mode, a calibration software program is run.
In the closed loop calibration mode, the calibration program may calibrate the corresponding closed loop data under different powers, generate a closed loop power calibration value list under different frequencies, store the closed loop power calibration value list in the memory, and send the closed loop power calibration value list to the first control unit 301. The closed loop power calibration value list may be as shown in table 1.
Table 1 closed loop power calibration value list
Figure SMS_1
Wherein FREQ1 to FREQN represent N different frequencies, and CODEJ represents closed loop power calibration values (1.ltoreq.I.ltoreq.N, 1.ltoreq.J.ltoreq.N) corresponding to different frequencies and output powers.
In the closed loop mode of operation, the analog switch S1 in the ALC control module 307 is open and the analog switches S2, S3 are closed. The controller of the ALC control module 307 (such as the FPGA shown in fig. 5, but not limited thereto) may call the closed loop power calibration value according to the power indication of the display panel of the dual tone signal source and output the single tone signal. The power indication of the display panel of the dual tone signal source is used to indicate a first target amplitude and a second target amplitude.
In the open loop calibration mode, the programmable step attenuator of the first signal source 203 or the second signal source 204 is set to be a 110dB attenuation range; the analog switches S1 and S3 in the ALC control module 307 are opened, the analog switch S2 is closed, and the upper computer sends a command to enable the dual-tone signal source to perform closed-loop frequency and power scanning. The ADC in the ALC control block 307 samples the output voltage of the loop integrator, which is transferred to the controller of the ALC control block 307 for storage and generation of a list of open loop power calibration values. The open loop power calibration value list may be as shown in table 2. The open loop power calibration value list in table 2 is mapped one-to-one with the contents of the closed loop power calibration value list of table 1.
Table 2 open loop power calibration value list
Figure SMS_2
Wherein FREQ1 to FREQN represent N different frequencies, and CODEI 'J' represents closed loop power calibration values (1.ltoreq.I '. Ltoreq.N, 1.ltoreq.J'. Ltoreq.N) corresponding to the different frequencies and output powers.
In the open loop mode of operation, the analog switch S2 of the ALC control module 307 is open and the analog switches S1, S3 are closed. The ALC control module 307 controls the power calibration value to be adjusted according to the power indication of the display panel of the dual-tone signal source, and outputs a single-tone signal.
The two power control modes of open loop and closed loop can make the double-tone signal source meet the requirement of power stability under the control of closed loop and meet the requirement of signal agility under the control of open loop.
Based on the foregoing any of the embodiments, the first signal source 203 and the combiner 205 are connected through a second single pole double throw switch; the second signal source 204 is connected to the combiner 205 through a third single pole double throw switch.
Specifically, the first signal source 203 may be connected to an input of a second single pole double throw switch, and a first output of the second single pole double throw switch may be connected to the combiner 205.
The second single pole double throw switch can be electrically connected to the control module 201. In the case of outputting a double-tone signal, under the control of the control module 201, the input end of the second single-pole double-throw switch is communicated with the first output end of the second single-pole double-throw switch, and the first single-tone signal is input into the combiner 205 to perform the combining process, so as to generate the double-tone signal.
Under the control of the control module 201, the input end of the second single-pole double-throw switch is communicated with the second output end of the second single-pole double-throw switch, so that the first single-tone signal can be directly output.
The second signal source 204 may be connected to an input of a third single pole double throw switch, and a first output of the third single pole double throw switch may be connected to the combiner 205.
The third single pole double throw switch can be electrically connected to the control module 201. In the case of outputting a double-tone signal, under the control of the control module 201, the input end of the third single-pole double-throw switch is communicated with the first output end of the third single-pole double-throw switch, and the first single-tone signal is input into the combiner 205 to perform the combining process, so as to generate the double-tone signal.
Under the control of the control module 201, the input end of the third single-pole double-throw switch is communicated with the second output end of the third single-pole double-throw switch, so that the second single-tone signal can be directly output.
It can be understood that in the linearity test scene, the dual-tone signal source provided by the embodiment of the invention can be used as a dual-tone signal source; other daily scenes are summarized, and the method can be used as two single-channel microwave signal sources. The dual-tone signal source provided by the embodiment of the invention can be used as a testing instrument to better meet various testing conditions.
According to the embodiment of the invention, the second single-pole double-throw switch and the third single-pole double-throw switch are controlled, so that the double-tone signal source can flexibly output the double-tone signal, the first single-tone signal or the second single-tone signal, more test scenes can be met, and the application range is wider.
Based on the foregoing in any of the embodiments, the combiner 205 is a passive power divider.
Specifically, the combiner 205 may be a passive power divider, and the generated dual-tone signal has neither local oscillator leakage nor higher intermodulation products, so that the spectral purity is better than that of the dual-tone signal generated by vector source multi-tone mode mixing.
According to the embodiment of the invention, the two single-tone signals are combined through the passive power divider, larger intermodulation component strays are not generated, the generated double-tone signals have no local oscillator leakage or higher intermodulation component, the frequency spectrum purity is higher, the frequency spectrum purity of the double-tone signals can be optimized, and the accuracy of linearity test can be improved.
Based on any of the above embodiments, the passive power divider is a resistive passive power divider.
Specifically, the passive power divider can be a resistive passive power divider, so that the frequency spectrum purity of the double-tone signal can be further optimized, the frequency spectrum purity of the double-tone signal can be optimized, and the accuracy of linearity test can be improved. And the accuracy of the linearity test is improved.
In order to facilitate understanding of the above embodiments of the present invention, a dual tone signal source provided by the above embodiments of the present invention will be described below by way of an example.
Fig. 6 is a second schematic diagram of a dual-tone signal source according to the present invention. As shown in fig. 6, the dual-tone signal source includes two 40GHz signal sources (40 GHz signal source 1 and 40GHz signal source 2) and a combiner. The FPGA in fig. 6 is a control module.
The 40GHz signal source 1 may be a first signal source and the 40GHz signal source 2 may be a second signal source. Accordingly, the single pole double throw switch 1 may be a second single pole double throw switch, and the single pole double throw switch 2 may be a third single pole double throw switch.
Alternatively, the 40GHz signal source 2 may be a first signal source and the 40GHz signal source 1 may be a second signal source. Accordingly, the single pole double throw switch 2 may be a second single pole double throw switch, and the single pole double throw switch 1 may be a third single pole double throw switch.
The reference module may process an input signal having a frequency of 10MHz into a reference signal having a frequency of 100MHz, and input the reference signal to the 40GHz signal source 1 and the 40GHz signal source 2.
The dual-tone signal source can have two working modes, namely an independent working mode and a dual-tone working mode. The following description will take a 40GHz signal source 1 as a first signal source and a 40GHz signal source 2 as a second signal source as an example.
Independent mode of operation
1. The FPGA controls the single-pole double-throw switch 1 to conduct the radio frequency signal (namely the first single-tone signal) of the 40GHz signal source 1 to the PORT PORT1 for output.
2. The FPGA controls the single-pole double-throw switch 2 to conduct the radio frequency signal (namely the second single-tone signal) of the 40GHz signal source 2 to the PORT PORT2 for output.
3. The two PORTs PORT1 and PORT2 are mutually independent, and a user can respectively adjust the frequency, the amplitude and the phase of the two channels. At this time, PORT3 has no signal output.
Double-tone operation mode
1. The FPGA controls the single-pole double-throw switch 1 to conduct the radio frequency signal of the 40GHz signal source 1 to the combiner for combining.
2. The FPGA controls the single-pole double-throw switch 2 to conduct the radio frequency signal of the 40GHz signal source 2 to the combiner for combining.
3. The two microwave signals are combined by the combiner to generate a double-tone signal, and the double-tone signal is output by the PORT PORT 3.
The two single-tone signals of the double-tone signal are mutually independent, and a user can respectively adjust the frequency, the amplitude and the phase of each signal. At this time, PORTs PORT1 and PORT2 do not output.
A phase adjusting function is built in a frequency synthesizer module of a 40GHz signal source in the dual-tone signal source, a 0.01-3 GHz gain control function is built in a frequency divider, and a 3-40 GHz gain control function is built in a frequency multiplier, so that each channel of the dual-tone signal source can independently adjust frequency, amplitude and phase.
The frequency synthesizer module of the 40GHz signal source in the dual-tone signal source can output a first signal with the frequency range of 6-12 GHz; the frequency divider can output a second signal with the frequency range of 0.01-3 GHz and a third signal with the frequency range of 3-12 GHz; the frequency multiplier can output a fourth signal with the frequency range of 3-24 GHz and a third signal with the frequency range of 24-40 GHz; the first detector is a 24GHz bridge and detector, and the frequency range of the detectable signal is 0.01-24 GHz; the first detector is a 40GHz bridge and detector, and the frequency range of the detectable signal is 24-40 GHz. The 40GHz signal source can output 0.01-40 GHz single-tone signals.
The dual tone signal source also provides two modes of operation. The linearity test scene can be used as a double-tone signal source and can be used as two 40GHz single-channel microwave signal sources in daily life.
Therefore, the double-tone signal source can be used as a testing instrument to better meet various testing conditions.
The case of using the 40GHz signal source 2 as the first signal source and the 40GHz signal source 1 as the second signal source is similar to the case of using the 40GHz signal source 1 as the first signal source and the 40GHz signal source 2 as the second signal source, and will not be repeated here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A source of dual tone signals, comprising: the device comprises a control module, a reference module, a first signal source, a second signal source and a combiner;
the control module is respectively connected with the control end of the first signal source and the control end of the second signal source; the reference module is respectively connected with the input end of the first signal source and the input end of the second signal source; the combiner is respectively connected with the output end of the first signal source and the output end of the second signal source;
the first signal source is used for outputting a first single-tone signal according to a first target frequency, a first target phase and a first target amplitude input by the control module by taking the reference signal input by the reference module as a benchmark;
the second signal source is configured to output a second monophonic signal according to a second target frequency, a second target phase and a second target amplitude input by the control module, with the reference signal input by the reference module as a reference;
and the combiner is used for combining the first single-tone signal and the second single-tone signal and outputting a double-tone signal.
2. The dual tone signal source of claim 1, wherein the first signal source or the second signal source comprises: the frequency divider comprises a first control unit, a frequency synthesizer unit, a frequency divider, a frequency multiplier and a first single-pole double-throw switch;
The first control unit is respectively connected with the frequency synthesizer unit, the frequency divider and the frequency multiplier; the first control unit is connected with the control end of the first signal source;
the frequency synthesizer unit is connected with the reference end of the first signal source; the output end of the frequency synthesizer unit is connected with the input end of the frequency divider; the frequency synthesizer is used for outputting a first signal by taking the reference signal input by the reference module as a benchmark;
the first output end of the frequency divider is connected with the first input end of the first single-pole double-throw switch; the second output end of the frequency divider is connected with the input end of the frequency multiplier;
the frequency divider is used for performing frequency division processing on the first signal, outputting a second signal to a first input end of the first single-pole double-throw switch or outputting a third signal to the frequency multiplier; the frequency of the second signal is less than half of the lower limit of the frequency range of the first signal; the frequency range of the third signal is from half of the lower limit of the frequency range of the first signal to the first frequency;
the first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch; the second output end of the frequency multiplier is connected with the second input end of the first single-pole double-throw switch;
The frequency multiplier is used for performing frequency multiplication processing on the third signal, outputting a fourth signal to the first input end of the first single-pole double-throw switch or outputting a fifth signal to the second input end of the first single-pole double-throw switch; the frequency range of the fourth signal is from half of the lower limit of the frequency range of the first signal to a second frequency; the frequency range of the fifth signal is the second frequency to the third frequency.
3. The dual tone signal source of claim 2, wherein the first signal source or the second signal source further comprises: the first detector, the second detector and the ALC control module are connected with the first control unit;
the first output end of the frequency divider is connected with the first input end of the first single-pole double-throw switch through the first detector;
the first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch through the first detector; the second output end of the frequency multiplier is connected with the second input end of the first single-pole double-throw switch through the second detector;
the ALC control module is used for adjusting the signal output power of the frequency divider or the frequency multiplier based on the output of the first detector under the control of the first control unit, and adjusting the signal output power of the frequency multiplier based on the output of the second detector under the control of the first control unit.
4. The source of dual tone signals of claim 2, wherein the first output of the frequency divider is connected to the first input of the first single pole double throw switch through a first harmonic filter bank and a second harmonic filter bank;
the first output end of the frequency multiplier is connected with the first input end of the first single-pole double-throw switch through the second harmonic filter bank.
5. The source of dual tone signals of claim 2, wherein the frequency synthesizer is configured to perform phase adjustment on the first signal.
6. The dual tone signal source of claim 3, wherein the divider is further configured to gain control the second signal.
7. The dual tone signal source of claim 3, wherein the frequency multiplier is further configured to gain control the fourth signal and the fifth signal.
8. The dual sound signal source of claim 1, wherein the first signal source is connected to the combiner through a second single pole double throw switch; the second signal source is connected with the combiner through a third single-pole double-throw switch.
9. The dual tone signal source of any of claims 1 to 8, wherein the combiner is a passive power divider.
10. The dual tone signal source of claim 9, wherein the passive power divider is a resistive passive power divider.
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