CN213906655U - X-waveband low-stray low-phase-noise frequency synthesizer - Google Patents
X-waveband low-stray low-phase-noise frequency synthesizer Download PDFInfo
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- CN213906655U CN213906655U CN202022996347.XU CN202022996347U CN213906655U CN 213906655 U CN213906655 U CN 213906655U CN 202022996347 U CN202022996347 U CN 202022996347U CN 213906655 U CN213906655 U CN 213906655U
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Abstract
The utility model provides a low stray low phase noise frequency synthesizer of X wave band belongs to microwave hybrid integrated circuit technical field, including internal reference and input reference looks coherent circuit, first broadband integrated VCO phase-locked loop, first low pass filter, second broadband integrated VCO phase-locked loop, amplifier, second low pass filter; the output end of the internal reference and input reference coherent circuit is connected with the input end of a first broadband integrated VCO phase-locked loop, the output end of the first broadband integrated VCO phase-locked loop is connected with the input end of a first low-pass filter, the output end of the first low-pass filter is connected with the input end of a second broadband integrated VCO phase-locked loop, the output end of the second broadband integrated VCO phase-locked loop is connected with the input end of an amplifier, and the output end of the amplifier is connected with the input end of a second low-pass filter. The utility model provides a small, with low costs, the debugging degree of difficulty is little, control accuracy and the high X wave band of reliability hang down stray low phase noise frequency synthesizer.
Description
Technical Field
The utility model belongs to the technical field of the microwave hybrid integrated circuit, concretely relates to low stray low phase noise frequency synthesizer of X wave band.
Background
The frequency synthesizer is used as an important component module of a communication system, various indexes of the frequency synthesizer are very critical, particularly phase noise and spurious signals, and the phase noise influences various performances of the communication system, for example, in a receiver, the phase noise determines the signal-to-noise ratio of the receiver, adjacent channel suppression and the like; the spurious indicators affect the sensitivity of the system receiver.
Frequency synthesizers generally have three ways in circuit implementation: direct frequency synthesis, direct digital frequency synthesis, and indirect frequency synthesis (i.e., Phase Locked Loop (PLL)). The direct frequency synthesizer has the advantages of high frequency conversion speed, wide bandwidth, good phase noise index and the disadvantages of complex circuit structure, large power consumption, large volume and high cost. The direct digital frequency synthesizer has the advantages of high frequency conversion speed, high frequency resolution, good phase noise performance, lower realization frequency and poorer spurious suppression. Indirect frequency synthesizers have the advantage that a wider frequency range and higher frequencies can be achieved, as well as excellent spur rejection, and the disadvantage that the frequency conversion time and frequency resolution are poor. How to select a proper frequency synthesis scheme to optimize the overall performance becomes a difficult problem of engineering design.
An object of the utility model is to provide a low spurious X wave band frequency synthesizer of low phase noise of broadband that small, with low costs, the debugging degree of difficulty is little, control accuracy and reliability are high. The integrated level is high, the structure is simple, the performance is reliable, and the local vibration source can be provided for different systems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the X-band low-stray low-phase-noise frequency synthesizer has the advantages of small size, low cost, small debugging difficulty, high control precision and high reliability.
In order to solve the technical problem, the utility model adopts the technical scheme that:
an X-band low-spurious low-phase-noise frequency synthesizer comprises an internal reference and input reference phase-coherent circuit, a first broadband integrated VCO phase-locked loop, a first low-pass filter, a second broadband integrated VCO phase-locked loop, an amplifier and a second low-pass filter;
the internal reference and input reference coherent circuit is provided with an input end and an output end, the output end of the internal reference and input reference coherent circuit is connected with the reference signal input end of a first broadband integrated VCO phase-locked loop, the signal output end of the first broadband integrated VCO phase-locked loop is connected with the input end of a first low-pass filter, the output end of the first low-pass filter is connected with the reference signal input end of a second broadband integrated VCO phase-locked loop, the signal output end of the second broadband integrated VCO phase-locked loop is connected with the signal input end of an amplifier, and the signal output end of the amplifier is connected with the input end of a second low-pass filter.
Furthermore, the internal reference and input reference coherent circuit comprises a digital phase-locked loop and a voltage-controlled crystal oscillator, wherein a reference signal input end of the digital phase-locked loop is used as an input end of the internal reference and input reference coherent circuit, a feedback signal input end of the digital phase-locked loop is connected with a feedback signal output end of the voltage-controlled crystal oscillator, a control signal output end of the digital phase-locked loop is connected with a control signal input end of the voltage-controlled crystal oscillator, and an oscillation signal output end of the voltage-controlled crystal oscillator is used as an output end of the internal reference and input reference coherent circuit.
Further, the frequency of the voltage controlled crystal oscillator is 100 MHz.
Further, the digital phase-locked loop employs ADF 4002.
Further, the first wideband integrated VCO phase locked loop employs HMC830LP6G and the second wideband integrated VCO phase locked loop employs LMX 2594.
Further, the amplifier employs HMC902LP 3.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
by adopting the technical scheme, the reference frequency is finely adjusted through the first broadband integrated VCO phase-locked loop and the second broadband integrated VCO phase-locked loop, spurious and fractional spurious output boundaries of a frequency device can be effectively avoided, phase noise is reduced, and the high-precision broadband integrated VCO phase-locked loop is selected for use, so that the output precision is higher. The utility model discloses not only simple structure, integrated level are high, the debugging work load is little, have the advantage that the reliability is high, with low costs moreover.
Drawings
FIG. 1 is a schematic diagram of an X-band low-spurious low-phase-noise frequency synthesizer;
FIG. 2 is a schematic structural view of embodiment 1;
in the drawings: VCXO-voltage controlled crystal oscillator, PLL 1-first wideband integrated VCO phase lock loop, PLL 2-second wideband integrated VCO phase lock loop.
Detailed Description
The features and properties of the present invention will be described in further detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, an X-band low spurious low phase noise frequency synthesizer includes an internal reference and input reference phase reference circuit, a first wideband integrated VCO phase locked loop PLL1, a first low pass filter, a second wideband integrated VCO phase locked loop PLL2, an amplifier, a second low pass filter;
the internal reference and input reference coherent circuit is provided with an input end and an output end, the output end of the internal reference and input reference coherent circuit is connected with the reference signal input end of the first broadband integrated VCO phase-locked loop PLL1, the signal output end of the first broadband integrated VCO phase-locked loop PLL1 is connected with the input end of the first low-pass filter, the output end of the first low-pass filter is connected with the reference signal input end of the second broadband integrated VCO phase-locked loop PLL2, the signal output end of the second broadband integrated VCO phase-locked loop PLL2 is connected with the signal input end of the amplifier, and the signal output end of the amplifier is connected with the input end of the second low-pass filter.
The utility model discloses at the during operation, in the inside reference of outside reference signal input and the input reference looks coherent circuit, accomplish homophase looks coherent with the inside reference. The reference signal with in-phase coherent is sent to the first wideband integrated VCO PLL1 to lock and output a fine step sweep signal with a specific frequency. Then the fine stepping sweep frequency signal is sent to a second broadband integrated VCO phase-locked loop PLL2 after clutter signals outside the specific frequency are filtered by a first low-pass filter, the fine stepping broadband low-phase-noise low-spurious signal is output after processing, then an amplifier amplifies the required X-frequency band signal, and finally the second low-pass filter outputs the fine stepping broadband low-phase-noise low spurious signal after harmonic suppression is carried out on the X-frequency band signal.
In addition, in the above X-band low-stray low-phase-noise frequency synthesizer, the internal reference and input reference phase-coherent circuit includes a digital phase-locked loop and a voltage-controlled crystal oscillator VCXO, a reference signal input terminal of the digital phase-locked loop is used as an input terminal of the internal reference and input reference phase-coherent circuit, a feedback signal input terminal of the digital phase-locked loop is connected to a feedback signal output terminal of the voltage-controlled crystal oscillator VCXO, a control signal output terminal of the digital phase-locked loop is connected to a control signal input terminal of the voltage-controlled crystal oscillator VCXO, and an oscillation signal output terminal of the voltage-controlled crystal oscillator VCXO is used as an output terminal of the internal reference and input reference phase-coherent circuit.
The internal reference and input reference coherent circuit has the functions that an external reference signal is input into the circuit, a digital phase-locked loop divides the frequency of the input reference signal, phase discrimination is carried out on the frequency of the input reference signal and the output frequency of a voltage-controlled crystal oscillator VCXO to obtain frequency and phase errors, then the output signal of the digital phase-locked loop is controlled, the signal is used as a feedback signal to reversely control the output frequency of the voltage-controlled crystal oscillator VCXO to form feedback, and finally the output frequency and the phase of the voltage-controlled crystal oscillator VCXO are stabilized, so that the function of internal reference and input reference in-phase coherent is realized.
In addition, for the selection of the components of the frequency synthesizer, the frequency of the voltage-controlled crystal oscillator is preferably 100MHz, and the ADF4002 is adopted in the digital phase-locked loop. The first wideband integrated VCO phase-locked loop employs HMC830LP6G, the second wideband integrated VCO phase-locked loop employs LMX2594, and the amplifier employs HMC902LP 3.
Example 1
As shown in fig. 2, a digital phase-locked loop ADF4002, a voltage controlled crystal oscillator with an internal frequency of 100MHz, a wideband integrated VCO phase-locked loop HMC830LP6G, a wideband integrated VCO phase-locked loop LMX2594, an amplifier HMC902LP3, and two low-pass filters a and B are prepared, the input reference signal frequency is 10MHz, and the output wideband low-phase-noise low-spurious signal is in a frequency range of 6GHz to 8 GHz.
Then, the reference signal input end of the digital phase-locked loop ADF4002 is used as the input end of the internal reference and input reference phase-locked circuit, the feedback signal input end of the digital phase-locked loop ADF4002 is connected with the feedback signal output end of the voltage-controlled crystal oscillator, the control signal output end of the digital phase-locked loop ADF4002 is connected with the control signal input end of the voltage-controlled crystal oscillator, the oscillation signal output end of the voltage-controlled crystal oscillator is connected with the reference signal input end of the broadband integrated VCO phase-locked loop HMC830LP6G, the signal output end of the broadband integrated VCO phase-locked loop HMC830LP6G is connected with the input end of the low-pass filter A, the output end of the low-pass filter A is connected with the reference signal input end of the broadband integrated VCO phase-locked loop LMX2594, the signal output end of the broadband integrated VCO phase-locked loop LMX2594 is connected with the signal input end of the amplifier HMC902LP3, and the signal output end of the amplifier HMC LP3 is connected with the input end of the low-pass filter B.
The working flow of the X-band low-spurious low-phase-noise frequency synthesizer in practical application is as follows:
1. the external reference 10MHz is locked at 100MHz through a digital phase-locked loop ADF4002, and internal 100MHz and external reference in-phase coherence are completed;
sending the 2.100MHz reference into a wideband integrated VCO phase-locked loop HMC830LP6G, and locking and outputting a fine stepping sweep frequency signal of 57.5 MHz-58.5 MHz;
3. the low-pass filter A filters clutter signals except 57.5 MHz-58.5 MHz;
4.57.5 MHz-58.5 MHz reference signals are sent into a broadband integrated VCO phase-locked loop LMX2594, and fine-stepping broadband low-phase-noise low-spurious signals are output;
5. the amplifier HMC902LP3 amplifies the required X-band signal;
6. and the low-pass filter B outputs a fine-step broadband low-phase-noise low-stray signal after performing harmonic suppression on the X-frequency band signal, and the frequency range is 6 GHz-8 GHz.
In this embodiment, the final output signal frequency range outputs any desired frequency in the range of 10MHz to 15GHz according to the frequency range of the wideband integrated VCO pll LMX 2594.
Meanwhile, as shown in the following table, according to the technical scheme, the phase-locked loop of the VCO integrated by replacing the same type of wideband can output different frequencies.
| Integrated VCO PLL model | Frequency range |
| LMX2572 | 28MHz～6400MHz |
| LMX2582 | 20MHz～5500MHz |
| LMX2592 | 20MHz～9800MHz |
| LMX2595 | 20MHz～19000MHz |
Claims (6)
1. An X-band low-spurious low-phase-noise frequency synthesizer, comprising: the VCO comprises an internal reference and input reference coherent circuit, a first broadband integrated VCO phase-locked loop, a first low-pass filter, a second broadband integrated VCO phase-locked loop, an amplifier and a second low-pass filter;
the internal reference and input reference phase-reference circuit is provided with an input end and an output end, the output end of the internal reference and input reference phase-reference circuit is connected with the reference signal input end of the first broadband integrated VCO phase-locked loop, the signal output end of the first broadband integrated VCO phase-locked loop is connected with the input end of the first low-pass filter, the output end of the first low-pass filter is connected with the reference signal input end of the second broadband integrated VCO phase-locked loop, the signal output end of the second broadband integrated VCO phase-locked loop is connected with the signal input end of the amplifier, and the signal output end of the amplifier is connected with the input end of the second low-pass filter.
2. An X-band low spurious low phase noise frequency synthesizer as claimed in claim 1, wherein: the internal reference and input reference coherent circuit comprises a digital phase-locked loop and a voltage-controlled crystal oscillator, wherein a reference signal input end of the digital phase-locked loop is used as an input end of the internal reference and input reference coherent circuit, a feedback signal input end of the digital phase-locked loop is connected with a feedback signal output end of the voltage-controlled crystal oscillator, a control signal output end of the digital phase-locked loop is connected with a control signal input end of the voltage-controlled crystal oscillator, and an oscillation signal output end of the voltage-controlled crystal oscillator is used as an output end of the internal reference and input reference coherent circuit.
3. An X-band low spurious low phase noise frequency synthesizer as claimed in claim 2, wherein: the frequency of the voltage-controlled crystal oscillator is 100 MHz.
4. An X-band low spurious low phase noise frequency synthesizer as claimed in claim 2, wherein: the digital phase locked loop employs ADF 4002.
5. An X-band low spurious low phase noise frequency synthesizer as claimed in claim 1, wherein: the first wideband integrated VCO phase locked loop employs HMC830LP6G, and the second wideband integrated VCO phase locked loop employs LMX 2594.
6. An X-band low spurious low phase noise frequency synthesizer as claimed in claim 1, wherein: the amplifier employs an HMC902LP 3.
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| CN202022996347.XU CN213906655U (en) | 2020-12-14 | 2020-12-14 | X-waveband low-stray low-phase-noise frequency synthesizer |
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| CN202022996347.XU CN213906655U (en) | 2020-12-14 | 2020-12-14 | X-waveband low-stray low-phase-noise frequency synthesizer |
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