CN215818135U - Frequency hopping frequency source and communication device - Google Patents
Frequency hopping frequency source and communication device Download PDFInfo
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- CN215818135U CN215818135U CN202122100471.8U CN202122100471U CN215818135U CN 215818135 U CN215818135 U CN 215818135U CN 202122100471 U CN202122100471 U CN 202122100471U CN 215818135 U CN215818135 U CN 215818135U
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Abstract
The utility model relates to the technical field of wireless communication, and provides a frequency hopping frequency source and a communication device, wherein the frequency hopping frequency source comprises: the DDS module, the frequency multiplication module and the frequency mixing module; the input end of the DDS module is used for receiving a reference clock signal, and the output end of the DDS module and the first input end of the frequency mixing module are connected; the input end of the frequency doubling module is used for receiving a reference clock signal, and the output end of the frequency doubling module is connected with the second input end of the frequency mixing module; and the output end of the frequency mixing module is used for outputting a local oscillation signal. The DDS module is used for generating a small stepping signal according to the reference clock signal; the frequency multiplication module is used for multiplying the reference clock signal to generate a frequency multiplication signal; and the frequency mixing module is used for mixing the small stepping signals and the frequency doubling signals to obtain local oscillation signals. The utility model synthesizes the local oscillator signal by using the frequency mixer, reserves the advantage of low noise of direct frequency synthesis phase, and simultaneously adopts the DDS module to realize rapid frequency hopping, thereby meeting the requirements of practical application.
Description
Technical Field
The utility model belongs to the technical field of wireless communication, and particularly relates to a frequency hopping frequency source and a communication device.
Background
With the development of wireless communication technology, frequency hopping communication is widely applied to the field of wireless communication by virtue of good anti-interception and anti-interference capabilities. The frequency source is used for providing carrier waves for the baseband modulation signals, the phase noise of the frequency source directly influences the receiving sensitivity of the communication system, and the frequency hopping speed directly influences the anti-interference capacity of the communication system.
In the prior art, the synthesis methods of the frequency source include a direct frequency synthesis technology and an indirect frequency synthesis technology. The frequency hopping speed of the direct frequency synthesis technology is limited, the phase noise of the indirect frequency synthesis technology is large, and the direct frequency synthesis technology and the indirect frequency synthesis technology cannot meet the requirements of quick frequency hopping and small phase noise at the same time and cannot meet the requirements of practical application.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present invention provide a frequency hopping frequency source and a communication device, so as to solve the problem that the frequency hopping frequency source in the prior art cannot simultaneously meet the requirements of fast frequency hopping and low phase noise.
A first aspect of an embodiment of the present invention provides a frequency hopping frequency source, including: the DDS module, the frequency multiplication module and the frequency mixing module;
the input end of the DDS module is used for receiving a reference clock signal, and the output end of the DDS module and the first input end of the frequency mixing module are connected; the input end of the frequency doubling module is used for receiving a reference clock signal, and the output end of the frequency doubling module is connected with the second input end of the frequency mixing module; the output end of the frequency mixing module is used for outputting a local oscillator signal;
the DDS module is used for generating a small stepping signal according to the reference clock signal; the frequency multiplication module is used for multiplying the reference clock signal to generate a frequency multiplication signal; and the frequency mixing module is used for mixing the small stepping signals and the frequency doubling signals to obtain local oscillation signals.
Optionally, the DDS module includes: the first DDS chip, the first amplifier and the first filter;
the first input end of the first DDS chip is connected with the input end of the DDS module, the second input end of the first DDS chip is used for receiving a control signal, and the output end of the first DDS chip is connected with the input end of the first amplifier;
the input end of the first filter is connected with the output end of the first amplifier, and the output end of the first filter is connected with the output end of the DDS module.
Optionally, the DDS module includes: the second DDS chip, the phase discriminator and the voltage controlled oscillator;
the first input end of the phase discriminator is connected with the input end of the DDS module, the second input end of the phase discriminator is connected with the output end of the second DDS chip, and the output end of the phase discriminator is connected with the input end of the voltage-controlled oscillator;
a first output end of the voltage-controlled oscillator is connected with a first input end of the second DDS chip, and a second output end of the voltage-controlled oscillator is connected with an output end of the DDS module;
the second input end of the second DDS chip is used for receiving a control signal.
Optionally, the DDS module may further include: a loop filter;
the input end of the loop filter is connected with the output end of the phase discriminator, and the output end of the loop filter is connected with the input end of the voltage-controlled oscillator.
Optionally, the frequency doubling module includes: a frequency multiplier, a second amplifier and a second filter;
the input end of the frequency multiplier is connected with the input end of the frequency doubling module, and the output end of the frequency multiplier is connected with the input end of the second amplifier;
the output end of the second amplifier is connected with the input end of the second filter; the output end of the second filter is connected with the output end of the frequency doubling module.
Optionally, the frequency mixing module includes: a mixer, a third amplifier and a third filter;
the first input end of the frequency mixer is connected with the first input end of the frequency mixing module, the second input end of the frequency mixer is connected with the second input end of the frequency mixing module, and the output end of the frequency mixer is connected with the input end of the third amplifier;
the output end of the third amplifier is connected with the input end of the third filter; and the output end of the third filter is connected with the output end of the frequency mixing module.
Optionally, the frequency of the reference clock signal is 100 MHz; the frequency of the multiplied signal is 4.8 GHz.
Optionally, the center frequency of the small step signal is 210MHz, the bandwidth is 10MHz, the step is 1KHz, and the frequency hopping rate is less than 20 us.
Optionally, the frequency hopping frequency source further includes: an output module;
the input end of the output module is connected with the output end of the frequency mixing module, and the output end of the output module is used for outputting a local oscillation signal;
the output module is used for amplifying and filtering the signal output by the mixer.
A second aspect of embodiments of the present invention provides a communications apparatus, including any one of the frequency hopping frequency sources of the first aspect of embodiments of the present invention.
The embodiment of the utility model provides a frequency hopping frequency source and a communication device, wherein the frequency hopping frequency source comprises: the DDS module, the frequency multiplication module and the frequency mixing module; the input end of the DDS module is used for receiving a reference clock signal, and the output end of the DDS module and the first input end of the frequency mixing module are connected; the input end of the frequency doubling module is used for receiving a reference clock signal, and the output end of the frequency doubling module is connected with the second input end of the frequency mixing module; and the output end of the frequency mixing module is used for outputting a local oscillation signal. The embodiment of the utility model synthesizes the local oscillator signal by using the frequency mixer, reserves the advantage of low phase noise of direct frequency synthesis, can realize rapid frequency hopping by using the DDS module, provides a frequency hopping frequency source with low phase noise and high frequency hopping speed, and can meet the requirements of practical application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a frequency hopping frequency source according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another frequency hopping frequency source according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a third frequency hopping frequency source according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a fourth frequency hopping frequency source according to an embodiment of the present invention;
fig. 5 is a schematic circuit structure diagram of a frequency doubling module according to an embodiment of the present invention;
fig. 6 is a schematic circuit structure diagram of a frequency mixing module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, an embodiment of the present invention provides a frequency hopping frequency source, including: a DDS module 11, a frequency doubling module 12 and a frequency mixing module 13;
the input end of the DDS module 11 is configured to receive a reference clock signal CLK, and the output end of the DDS module 11 and the first input end of the frequency mixing module 13; the input end of the frequency doubling module 12 is used for receiving a reference clock signal CLK, and the output end of the frequency doubling module 12 is connected with the second input end of the frequency mixing module 13; the output end of the frequency mixing module 13 is used for outputting a local oscillator signal;
the DDS module 11 is used for generating a small step signal according to a reference clock signal CLK; the frequency multiplication module 12 is configured to multiply the frequency of the reference clock signal CLK to generate a frequency multiplied signal; the frequency mixing module 13 is configured to perform frequency mixing on the small step signal and the frequency multiplication signal to obtain a local oscillation signal.
DDS (Direct Digital Synthesizer) is a key digitizing technique that can be used to generate frequency hopping signals. Simple and reliable, convenient to control, and has very high frequency resolution and switching speed, and is very suitable for the requirement of frequency hopping communication
In the embodiment of the utility model, a frequency multiplier is adopted for direct frequency synthesis to obtain a frequency-multiplied signal with low phase noise, and meanwhile, the DDS module 11 is adopted for generating a small step signal with rapid frequency hopping, so that frequency synthesis is carried out through the frequency mixer 131 to obtain a local oscillator signal. The embodiment of the utility model not only retains the characteristic of minimum deterioration of direct frequency synthesis to signal phase noise, but also retains the advantage of rapid frequency hopping of the DDS, can realize the output of local oscillation signals with high frequency hopping speed and low phase noise, and meets the requirements of practical application.
In some embodiments, referring to fig. 2, the DDS module 11 may include: a first DDS chip 111, a first amplifier 112, and a first filter 113;
a first input end of the first DDS chip 111 is connected to an input end of the DDS module 11, a second input end of the first DDS chip 111 is configured to receive a control signal Ctr, and an output end of the first DDS chip 111 is connected to an input end of the first amplifier 112;
the input of the first filter 113 is connected to the output of the first amplifier 112, and the output of the first filter 113 is connected to the output of the DDS module 11.
In the embodiment of the utility model, an integrated DDS chip can be adopted, and a small stepping signal is output after amplification and filtering.
In some embodiments, referring to fig. 3, the DDS module 11 may include: a second DDS chip 114, a phase detector 115, and a voltage controlled oscillator 116;
a first input end of the phase detector 115 is connected with an input end of the DDS module 11, a second input end of the phase detector 115 is connected with an output end of the second DDS chip 114, and an output end of the phase detector 115 is connected with an input end of the voltage-controlled oscillator 116;
a first output end of the voltage-controlled oscillator 116 is connected with a first input end of the second DDS chip 114, and a second output end of the voltage-controlled oscillator 116 is connected with an output end of the DDS module 11;
a second input of the second DDS chip 114 is configured to receive a control signal Ctr.
The DDS spurious output is large and narrow in frequency range, and a Phase Locked Loop (PLL) can reduce the spurious output and improve the frequency range. Based on the above, the embodiment of the present invention combines the DDS and the PLL, and provides a DDS module 11 with low output spurious and wide frequency range.
In some embodiments, referring to fig. 4, the DDS module 11 may further include: a loop filter 117;
an input of the loop filter 117 is connected to an output of the phase detector 115 and an output of the loop filter 117 is connected to an input of the voltage controlled oscillator 116.
In some embodiments, the first DDS chip 111 and the second DDS chip 114 may each be model AD 9912.
In some embodiments, referring to fig. 5, frequency doubling module 12 may include: a frequency multiplier 121, a second amplifier 122, and a second filter 123;
the input end of the frequency multiplier 121 is connected with the input end of the frequency doubling module 12, and the output end of the frequency multiplier 121 is connected with the input end of the second amplifier 122;
the output of the second amplifier 122 is connected to the input of a second filter 123; the output end of the second filter 123 is connected to the output end of the frequency doubling module 12.
In some embodiments, referring to fig. 6, the mixing module 13 may include: a mixer 131, a third amplifier 132, and a third filter 133;
a first input end of the mixer 131 is connected with a first input end of the mixing module 13, a second input end of the mixer 131 is connected with a second input end of the mixing module 13, and an output end of the mixer 131 is connected with an input end of the third amplifier 132;
the output of the third amplifier 132 is connected to the input of a third filter 133; the output of the third filter 133 is connected to the output of the mixing module 13.
In some embodiments, the frequency hopping frequency source may further include: a control module; the control module is used for generating a control signal Ctr.
In some embodiments, the control module may include: the power supply unit, the singlechip and the voltage conversion unit; the power supply unit is used for supplying power for the singlechip and the voltage conversion unit. The singlechip is used for outputting an initial control signal; the voltage conversion unit is used for carrying out voltage conversion on the initial control signal to obtain a control signal Ctr.
Since the output voltage of the single chip may not match the input port voltage of the first DDS chip 111 or the second DDS chip 114, a voltage conversion unit is provided for signal voltage matching.
In some embodiments, the frequency hopping frequency source may further include: a reference clock module; the reference clock module is used for generating a reference clock signal CLK.
The reference clock module may include: the crystal oscillator, the fourth amplifier and the fourth filter;
the output end of the crystal oscillator is connected with the input end of the fourth amplifier, the output end of the fourth amplifier is connected with the input end of the fourth filter, and the output end of the fourth filter is used for outputting a reference clock signal CLK.
In some embodiments, the frequency of the reference clock signal CLK may be 100 MHz; the frequency of the multiplied frequency signal may be 4.8 GHz.
In some embodiments, the small step signal may have a center frequency of 210MHz, a bandwidth of 10MHz, a step of 1KHz, and a frequency hopping rate of less than 20 us.
In the embodiment of the utility model, the frequency of the frequency doubling signal is 4.8GHz, the center frequency of the small stepping signal is 210MHz, and the 5.01GHz local oscillation signal with high frequency hopping speed and low phase noise can be obtained after frequency mixing, wherein the phase noise can reach-118 dBc @1Khz, and the phase noise is relatively low. Wherein the minimum step of the small step signal can be 0.1 KHz.
In some embodiments, the frequency hopping frequency source may further include: an output module;
the input end of the output module is connected with the output end of the frequency mixing module 13, and the output end of the output module is used for outputting a local oscillation signal;
the output module is used for amplifying and filtering the signal output by the mixer 131.
In some embodiments, the output module may include: a fifth amplifier and a sixth filter.
Corresponding to any one of the frequency hopping frequency sources, an embodiment of the present invention further provides a communication device, which includes any one of the frequency hopping frequency sources and has advantages of the frequency hopping frequency source, and details are not repeated herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A frequency hopping frequency source, comprising: the DDS module, the frequency multiplication module and the frequency mixing module;
the input end of the DDS module is used for receiving a reference clock signal, and the output end of the DDS module and the first input end of the frequency mixing module are connected; the input end of the frequency doubling module is used for receiving the reference clock signal, and the output end of the frequency doubling module is connected with the second input end of the frequency mixing module; the output end of the frequency mixing module is used for outputting a local oscillation signal;
the DDS module is used for generating a small stepping signal according to the reference clock signal; the frequency multiplication module is used for multiplying the frequency of the reference clock signal to generate a frequency multiplication signal; and the frequency mixing module is used for mixing the small stepping signal and the frequency doubling signal to obtain the local oscillation signal.
2. The frequency hopping frequency source of claim 1, wherein the DDS module comprises: the first DDS chip, the first amplifier and the first filter;
a first input end of the first DDS chip is connected with an input end of the DDS module, a second input end of the first DDS chip is used for receiving a control signal, and an output end of the first DDS chip is connected with an input end of the first amplifier;
the input end of the first filter is connected with the output end of the first amplifier, and the output end of the first filter is connected with the output end of the DDS module.
3. The frequency hopping frequency source of claim 1, wherein the DDS module comprises: the second DDS chip, the phase discriminator and the voltage controlled oscillator;
the first input end of the phase discriminator is connected with the input end of the DDS module, the second input end of the phase discriminator is connected with the output end of the second DDS chip, and the output end of the phase discriminator is connected with the input end of the voltage-controlled oscillator;
a first output end of the voltage-controlled oscillator is connected with a first input end of the second DDS chip, and a second output end of the voltage-controlled oscillator is connected with an output end of the DDS module;
and the second input end of the second DDS chip is used for receiving a control signal.
4. The frequency hopping frequency source of claim 3, wherein the DDS module further comprises: a loop filter;
the input end of the loop filter is connected with the output end of the phase discriminator, and the output end of the loop filter is connected with the input end of the voltage-controlled oscillator.
5. The frequency hopping frequency source of claim 1, wherein the frequency doubling module comprises: a frequency multiplier, a second amplifier and a second filter;
the input end of the frequency multiplier is connected with the input end of the frequency doubling module, and the output end of the frequency multiplier is connected with the input end of the second amplifier;
the output end of the second amplifier is connected with the input end of the second filter; and the output end of the second filter is connected with the output end of the frequency doubling module.
6. The frequency hopping frequency source of claim 1, wherein the mixing module comprises: a mixer, a third amplifier and a third filter;
a first input end of the mixer is connected with a first input end of the mixing module, a second input end of the mixer is connected with a second input end of the mixing module, and an output end of the mixer is connected with an input end of the third amplifier;
the output end of the third amplifier is connected with the input end of the third filter; and the output end of the third filter is connected with the output end of the frequency mixing module.
7. The frequency hopping frequency source of any one of claims 1 to 6, wherein the frequency of the reference clock signal is 100 MHz; the frequency of the frequency doubling signal is 4.8 GHz.
8. The frequency hopping frequency source of claim 7, wherein the small step signal has a center frequency of 210MHz, a bandwidth of 10MHz, a step of 1KHz, and a frequency hopping rate of less than 20 us.
9. The frequency hopping frequency source of any one of claims 1 to 6, further comprising: an output module;
the input end of the output module is connected with the output end of the frequency mixing module, and the output end of the output module is used for outputting the local oscillator signal;
the output module is used for amplifying and filtering the signals output by the frequency mixing module.
10. A communications device comprising the frequency hopping frequency source of any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114553148A (en) * | 2022-04-21 | 2022-05-27 | 中星联华科技（北京）有限公司 | Broadband fast frequency hopping frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114553148A (en) * | 2022-04-21 | 2022-05-27 | 中星联华科技（北京）有限公司 | Broadband fast frequency hopping frequency converter |
| CN114553148B (en) * | 2022-04-21 | 2022-08-19 | 中星联华科技（北京）有限公司 | Broadband fast frequency hopping frequency converter |
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