CN109286373B - Ku frequency band down converter - Google Patents
Ku frequency band down converter Download PDFInfo
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- CN109286373B CN109286373B CN201811114346.9A CN201811114346A CN109286373B CN 109286373 B CN109286373 B CN 109286373B CN 201811114346 A CN201811114346 A CN 201811114346A CN 109286373 B CN109286373 B CN 109286373B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- 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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Abstract
The invention discloses a Ku frequency band down converter, which comprises: the system comprises a local oscillation module, a frequency conversion module and a control module; the local oscillator module receives a reference signal and outputs an output local oscillator signal to the frequency conversion module, and the frequency conversion module converts an input Ku frequency band radio frequency input signal into an intermediate frequency output signal; the control module is connected to the local oscillation module and the frequency conversion module to control frequency and feed back state. The Ku frequency band down converter can output a low-frequency intermediate-frequency range by means of down conversion of high input frequency of a Ku frequency band.
Description
Technical Field
The invention relates to the technical field of frequency converters, in particular to a Ku frequency band down converter.
Background
Microwave communication has become one of the most important modes in almost all military and civilian communication systems. Because the Ku frequency band has small ground interference, large power and wide frequency band, and the Ku frequency band has higher receiving antenna efficiency, most satellite communication adopts the Ku frequency band. The intermediate frequency band in the ground terminal system is mostly 950-1450MHz, and in order to process the received satellite signals at the terminal, the Ku frequency band down converter becomes one of the key devices in the microwave communication system.
Disclosure of Invention
The invention aims to provide a Ku frequency band down converter which can output a low-frequency intermediate frequency range through a down-conversion mode at a high input frequency of a Ku frequency band.
In order to achieve the above object, the present invention provides a Ku band down converter including: the system comprises a local oscillation module, a frequency conversion module and a control module; the local oscillator module receives a reference signal and outputs an output local oscillator signal to the frequency conversion module, and the frequency conversion module converts an input Ku frequency band radio frequency input signal into an intermediate frequency output signal; the control module is connected to the local oscillation module and the frequency conversion module to control frequency and feed back state.
Preferably, the local oscillation module includes: the reference signal is respectively output to the first local oscillator module and the second local oscillator module through a first power divider, and the first local oscillator module obtains a local oscillator signal by adopting an anti-seismic phase-locking coaxial medium oscillating circuit; and the second local oscillation module obtains two local oscillation signals through fixed dot frequency.
Preferably, the first local oscillation module includes the following components connected in sequence: the phase detector, the loop filter, a local oscillator CRO group, the second power divider, the first amplifier, the third power divider, the frequency multiplier and the microstrip hairpin filter; one output end of the third power divider is connected to the frequency multiplier, and the other output end of the third power divider is connected to the phase detector.
Preferably, the phase detector has a phase detection frequency of 50MHz, and the phase noise of the phase detector at the maximum frequency point output is-86 dBc/Hz @100Hz, -95dBc/Hz @1kHz, -103dBc/Hz @10kHz, -102dBc/Hz @100kHz and-115 dBc/Hz @1 MHz.
Preferably, the second local oscillation module includes the following components connected in sequence: a second amplifier, a harmonic transmitter, a first filter, a second filter, a third amplifier, and a third filter.
Preferably, the frequency conversion module includes: the first down-conversion module is connected to the output end of the first local oscillator module so as to mix the Ku frequency band radio frequency input signal with the local oscillator signal and output a first down-conversion signal;
and the second down-conversion module is connected to the output end of the second down-conversion module so as to mix the first down-conversion signal with the two local oscillation signals and output an intermediate frequency signal.
Preferably, the first down-conversion module comprises the following components connected in sequence: the first mixer is connected with the first amplifier, the second mixer is connected with the second filter, and the third amplifier is connected with the fourth filter; the input end of the first frequency mixer is further connected with the local oscillator signal.
Preferably, the second down-conversion module comprises the following components connected in sequence: the second frequency mixer, the sixth filter, the second attenuator, the sixth amplifier, the third attenuator, the seventh amplifier, the high-pass filter, the fourth power divider and the low-pass filter; the power divider outputs an intermediate frequency output signal.
Preferably, the control module is connected to the local oscillation module and the frequency conversion module through serial ports.
Preferably, the fourth and fifth filters are MEMS filters; the loop filter, the first filter, the second filter, the third filter, the sixth filter, the high-pass filter and the low-pass filter are microstrip filters.
According to the technical scheme, the low-frequency intermediate-frequency range can be output by a Ku frequency band higher input frequency in a down-conversion mode, and meanwhile, the phase noise can reach-65 dBc/Hz @100Hz, -75dBc/Hz @1kHz, -85dBc/Hz @10kHz, -95dBc/Hz @100kHz and-107 dBc/Hz @1 MHz; the intermediate frequency output gain is adjustable; the noise figure and spurious output are small.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram illustrating a local oscillation module according to the present invention;
FIG. 2a is a block diagram illustrating the structure of a first downconversion module of the present invention;
FIG. 2b is a block diagram illustrating the structure of a second downconversion module of the present invention;
FIG. 3a is a block diagram of a control module illustrating one function of the present invention; and
FIG. 3b is a block diagram of a control module illustrating another function of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a Ku frequency band down converter, which comprises: the system comprises a local oscillation module, a frequency conversion module and a control module; the local oscillation module receives a reference signal and outputs an output local oscillation signal to the frequency conversion module, and the frequency conversion module converts an input Ku frequency band radio frequency input signal into an intermediate frequency output signal; the control module is connected to the local oscillation module and the frequency conversion module to control frequency and feed back state.
In a specific embodiment of the present invention, the local oscillation module may include: the reference signal is respectively output to the first local oscillator module and the second local oscillator module through a first power divider, and the first local oscillator module obtains a local oscillator signal by adopting an anti-seismic phase-locking coaxial medium oscillating circuit; and the second local oscillation module obtains two local oscillation signals through fixed dot frequency.
In this embodiment, the first local oscillation module includes the following components connected in sequence: the phase detector, the loop filter, a local oscillator CRO group, the second power divider, the first amplifier, the third power divider, the frequency multiplier and the microstrip hairpin filter; one output end of the third power divider is connected to the frequency multiplier, and the other output end of the third power divider is connected to the phase detector.
In the implementation mode, the phase detector has a phase detection frequency of 50MHz, and the phase noise of the phase detector at the maximum frequency point output is-86 dBc/Hz @100Hz, -95dBc/Hz @1kHz, -103dBc/Hz @10kHz, -102dBc/Hz @100kHz and-115 dBc/Hz @1 MHz.
In this embodiment, the second local oscillation module includes the following components connected in sequence: a second amplifier, a harmonic transmitter, a first filter, a second filter, a third amplifier, and a third filter.
In this embodiment, the frequency conversion module includes: the first down-conversion module is connected to the output end of the first local oscillator module so as to mix the Ku frequency band radio frequency input signal with the local oscillator signal and output a first down-conversion signal;
and the second down-conversion module is connected to the output end of the second down-conversion module so as to mix the first down-conversion signal with the two local oscillation signals and output an intermediate frequency signal.
In this embodiment, the first down-conversion module includes the following components connected in sequence: the first mixer is connected with the first amplifier, the second mixer is connected with the second filter, and the third amplifier is connected with the fourth filter; the input end of the first frequency mixer is further connected with the local oscillator signal.
In this embodiment, the second down-conversion module includes the following components connected in sequence: the second frequency mixer, the sixth filter, the second attenuator, the sixth amplifier, the third attenuator, the seventh amplifier, the high-pass filter, the fourth power divider and the low-pass filter; the power divider outputs an intermediate frequency output signal.
In this embodiment, the control module is connected to the local oscillation module and the frequency conversion module through serial ports.
In this embodiment, the fourth and fifth filters are MEMS filters; the loop filter, the first filter, the second filter, the third filter, the sixth filter, the high-pass filter and the low-pass filter are microstrip filters.
Fig. 1 shows a schematic block diagram of a local oscillation module according to the present invention, which mainly provides two down conversion modules with corresponding local oscillation signals, and mainly comprises a power divider, a loop filter, a microstrip hairpin filter, a phase-locked loop, a frequency multiplier, and an amplifier.
A local oscillator CRO group generates a local oscillator signal with a required bandwidth, and the local oscillator signal is input to the frequency multiplier and the phase discriminator through the power divider 1 (second power divider), the amplifier 1 (first amplifier) and the power divider 2 (third power divider). Because the output frequency range is a bandwidth with a step frequency hopping function, and the frequency hopping step is small, a decimal phase discrimination must be adopted, the phase discrimination frequency is selected to be 50MHz, and the output phase noise can be calculated by the following formula.
PNfloor＝Floor FOM+10log(fpd)+20log(fvco/fpd)
PNflick＝Flicker FOM+20log(fvco)-10log(foffset)
PN＝10log(10^(PNflick/10)+10^(PNfloor/10))
The simulation calculation can obtain that the output phase noise of the maximum frequency point of a local oscillator CRO is-86 dBc/Hz @100Hz, -95dBc/Hz @1kHz, -103dBc/Hz @10kHz, -102dBc/Hz @100kHz and-115 dBc/Hz @1 MHz.
Because the phase discrimination frequency is 50MHz and is close to the local oscillator output signal, the filter cannot well inhibit, and therefore, the stray signals generated by the VCO are inhibited by adopting a loop filter mode.
The frequency multiplier multiplies the frequency of a signal generated by a local oscillator CRO to an output signal required by a local oscillator module, and then inputs the output signal into the first-stage frequency conversion module. The microstrip hairpin filter is adopted to filter the output signal of the frequency multiplier, and stray is reduced.
The two-local oscillator output signal is a fixed dot frequency, and the reference signal of 100MHz passes through a harmonic generator, an amplifier and a filter to realize the output of the two-local oscillator signal. Since the phase noise of the second local oscillator is far better than the phase noise of the first local oscillator, the final intermediate frequency output phase noise mainly depends on the phase noise coefficients of the radio frequency signal and the first local oscillator signal.
Fig. 2 is a schematic block diagram of a frequency conversion module according to the present invention, which is mainly used to shift a radio frequency input with a higher frequency to a lower frequency and intermediate frequency range by means of down-conversion, and mainly comprises a mixer (a first mixer), a filter (a fourth filter, a fifth filter), an amplifier (a fourth amplifier, a fifth amplifier), an attenuator, and the like.
The filter 1 (fourth filter) adopts an MEMS filter, the passband range of the MEMS filter is mainly selected as the Ku frequency band input signal range, and the MEMS filter has a good effect of inhibiting the image frequency.
The mixer (first mixer) mixes the Ku band input signal with a local oscillator signal, and the first downconverted signal is output by the amplifier 1 (fourth amplifier) via the filter 2 (fifth filter).
The first down-conversion signal and the second local oscillator signal are mixed for the second time, and the final needed intermediate frequency signal is output through a filter (a fifth filter) and an amplifier (a fifth amplifier).
Fig. 3 is a schematic block diagram of a control module according to the present invention, in which the control module communicates via a serial port controller to perform frequency control and state feedback, and a lower computer decodes an instruction from an upper computer and then controls a logic controller to output a corresponding time sequence to implement frequency control of a product and provide feedback information.
According to the design method of the Ku frequency band down converter, the detachable SMA-K connector is used when the radio frequency input end and the medium frequency output end of the frequency conversion module are tested.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (4)
1. A Ku band downconverter, comprising: the system comprises a local oscillation module, a frequency conversion module and a control module; the local oscillator module receives a reference signal and outputs an output local oscillator signal to the frequency conversion module, and the frequency conversion module converts an input Ku frequency band radio frequency input signal into an intermediate frequency output signal; the control module is connected with the local oscillation module and the frequency conversion module to control the frequency and feed back the state;
the local oscillation module includes: the reference signal is respectively output to the first local oscillator module and the second local oscillator module through a first power divider, and the first local oscillator module obtains a local oscillator signal by adopting an anti-seismic phase-locking coaxial medium oscillating circuit; the second local oscillator module obtains a second local oscillator signal through fixed dot frequency;
the first local oscillator module comprises the following components connected in sequence: the phase discriminator, the loop filter, a local oscillator CRO group, a second power divider, a first amplifier, a third power divider, a frequency multiplier and a microstrip hairpin filter; one output end of the third power divider is connected to the frequency multiplier, and the other output end of the third power divider is connected to the phase discriminator;
the second local oscillator module comprises the following components connected in sequence: a second amplifier, a harmonic transmitter, a first filter, a second filter, a third amplifier, and a third filter;
the frequency conversion module comprises: the first down-conversion module is connected to the output end of the first local oscillator module so as to mix a Ku frequency band radio frequency input signal with the local oscillator signal and output a first down-conversion signal;
the second down-conversion module is connected to the output end of the first down-conversion module so as to mix the first down-conversion signal with the two local oscillation signals and output an intermediate frequency signal;
the first down-conversion module comprises the following components which are connected in sequence: the first mixer is connected with the first amplifier, the second mixer is connected with the second filter, and the third amplifier is connected with the fourth filter; the input end of the first frequency mixer is also connected with the local oscillator signal;
the second down-conversion module comprises the following components which are connected in sequence: the second frequency mixer, the sixth filter, the second attenuator, the sixth amplifier, the third attenuator, the seventh amplifier, the high-pass filter, the fourth power divider and the low-pass filter; the power divider outputs an intermediate frequency output signal.
2. The Ku frequency band down converter of claim 1, wherein the phase detector is a phase detector with a phase detection frequency of 50MHz, and the phase noise of the phase detector at the maximum frequency point output is-86 dBc/Hz @100Hz, -95dBc/Hz @1kHz, -103dBc/Hz @10kHz, -102dBc/Hz @100kHz and-115 dBc/Hz @1 MHz.
3. The Ku frequency band down converter according to claim 1, wherein the control module is connected to the local oscillation module and the frequency conversion module through serial ports.
4. The Ku band down converter as defined in claim 1, wherein the fourth and fifth filters are MEMS filters; the loop filter, the first filter, the second filter, the third filter, the sixth filter, the high-pass filter and the low-pass filter are microstrip filters.
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| CN111220847A (en) * | 2019-05-21 | 2020-06-02 | 一诺仪器（中国）有限公司 | Frequency conversion system and spectrum analyzer |
| CN111474507B (en) * | 2020-04-10 | 2021-08-10 | 电子科技大学 | Special multichannel radio frequency echo signal down converter of MR-EPT spectrometer |
| CN111953304B (en) * | 2020-07-30 | 2022-04-29 | 华中科技大学 | Front-end signal synthesis module for accelerator low-level control system |
| CN112187296A (en) * | 2020-09-08 | 2021-01-05 | 广州程星通信科技有限公司 | Frequency synthesis mobile-based Ka frequency band transmitter and implementation method thereof |
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