CN112087229B - Miniaturized low-cost multipath low-phase-noise low-spurious point frequency source - Google Patents
Miniaturized low-cost multipath low-phase-noise low-spurious point frequency source Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it
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Abstract
The invention provides a miniaturized low-cost multipath low-phase-noise low-spurious-point frequency source, which comprises: the comb spectrum generating circuit generates a higher harmonic signal according to the crystal oscillator signal; the C-band point frequency signal output circuit generates a C-band point frequency signal according to the higher harmonic signal through 3-level filtering, the band harmonic signal is divided into three paths of power division signals by the power divider, and the first path of power division signal is used for generating the C-band point frequency signal; the X-band point frequency signal output circuit generates a Ku-band point frequency signal according to a second path of power division signal of the power divider through 4 times frequency and 2-level filtering; the Ku band point frequency signal output circuit generates a Ku band point frequency signal according to a third power division signal of the power divider through 3 times frequency, 2 times frequency and 3 levels of filtering. The invention has the advantages of miniaturization, low cost, multipath point frequency source, small stray, low phase noise and the like, and can be applied to miniaturized microwave and millimeter wave frequency integrated systems.
Description
Technical Field
The invention relates to the technical field of microwave and millimeter wave circuit design, in particular to a miniaturized low-cost multipath low-phase-noise low-spurious-point frequency source.
Background
The requirements on frequency synthesis in electronic systems are increasing, high frequency, multi-band, low phase noise, low spurious, etc. With the increase of frequency, the performance of the frequency source is reduced, and in order to meet these performance requirements, the frequency synthesizer system usually adopts the technologies of frequency mixing and frequency multiplication, and is obtained by adopting the frequency mixing of the high-frequency point frequency source and the low-frequency step frequency source. PDRO (sampling phase-locked frequency source) has the advantages of low phase noise, low spurious emission and the like as a point frequency source, but has the defects of large volume, high price, low reliability and the like, and still limits the application range.
In the prior art, patent CN106452434a entitled "a synthesis system of low-noise low-power consumption point frequency source", publication date 2017, 2 and 22, describes a synthesis system of sampling phase-demodulation phase-locked loop, which can generate low-noise low-power consumption 8GHz point frequency source. Compared with the invention, the invention has larger volume, complex structure and low reliability, can only output single-point frequency signals, and limits the application range. The patent CN207677710U, a link structure of an ultralow phase noise frequency source, publication date 2018, month 07 and month 31, introduces a phase locking structure which has a function similar to a harmonic mixer and is inserted into a feedback loop of a phase locking loop, combines the advantages of a direct frequency synthesis mode and a digital frequency synthesis mode, provides a mixed frequency synthesis mode, and solves the requirement of a user on the ultralow phase noise frequency source with the required frequency which is not an integer multiple of a reference frequency. Compared with the invention, the invention has large volume, low stray performance and poor stability.
The patent CN207968463U is a microminiature point frequency source, and the publication date is 2018, 10 and 12, and a phase-locked loop circuit taking an ADF4106 chip as a core is introduced, wherein a voltage-controlled oscillator is composed of discrete components, passive components are all 0201 packaging components, and the point frequency source packaging size is greatly reduced through reasonable layout. Compared with the invention, the point frequency output frequency is not high, only single point frequency signals can be output, and the phase noise is poor.
11 months in 2015, yi and Du Yong and the like release papers on the journal of digital technology and application, namely 'design and realization of P-band point frequency sources', harmonic signals are generated through a comb spectrum generator, and frequency selection is carried out on the comb spectrum signals by utilizing a miniaturized switch filter bank, so that five-path point frequency output is realized, phase noise is low, and frequency conversion is rapid. Compared with the invention, the invention has large volume and low frequency, and the highest output frequency is 1GHz.
The above prior art patents or documents all implement the point frequency source module from different schemes, however, the above schemes have disadvantages, and have large volume and complex structure.
Disclosure of Invention
The invention aims to provide a miniaturized low-cost multipath low-phase-noise low-spurious-point frequency source, which can simultaneously generate point frequency signals of an X wave band, a C wave band and a Ku wave band and has the advantages of small volume, low phase noise and low spurious.
In order to achieve the above object, the present invention provides a miniaturized low-cost multipath low-phase noise low-spurious-point frequency source, comprising: the device comprises a comb spectrum generating circuit, a C-band point frequency signal output circuit, an X-band point frequency signal output circuit and a Ku-band point frequency signal output circuit;
the comb spectrum generating circuit generates a higher harmonic signal of an excitation signal according to the excitation signal input from the outside;
the input end of the C-band point frequency signal output circuit is connected with the output end of the comb spectrum generation circuit; the C-band point frequency signal output circuit comprises a first power divider; the input end of the X-band point frequency signal output circuit and the input end of the Ku-band point frequency signal output circuit are respectively connected with the output end of the first power divider;
the C-band point frequency signal output circuit generates a C-band harmonic signal according to the higher harmonic; the first power divider divides the power of the C-band point frequency signal into three paths of power division signals, wherein the first path of power division signals generate the C-band point frequency signal after power attenuation; the second power division signal is input into an X-band point frequency signal output circuit and is used for generating an X-band point frequency signal; the third power division signal is input into a Ku wave band point frequency signal output circuit and used for generating a Ku wave band point frequency signal.
Preferably, the comb spectrum generating circuit includes: an amplifying matching circuit and a step diode; the input end of the amplifying and matching circuit is connected with the excitation signal and is used for providing a signal with low noise and stable power for the step tube; the output end of the amplifying and matching circuit is connected with the input end of the step diode, and the higher harmonic signal is generated through the step diode.
Preferably, the C-band point frequency signal output circuit includes a first attenuator, a first band-pass filter, a first amplifier, a second band-pass filter, a second amplifier, a third band-pass filter, a first power divider, and a second attenuator, which are sequentially connected; the input end of the first attenuator is connected with the output end of the step diode, and the input end of the first band-pass filter is connected with the output end of the first attenuator; the input end of the second attenuator is connected with the first output end of the first power divider; the first attenuator and the second attenuator and the first amplifier and the second amplifier are used for adjusting the power of the C wave band signal.
Preferably, the passband ranges of the first, second and third bandpass filters are 2.58 GHz-2.62 GHz, and the stopband rejection is < [email protected], < [email protected].
Preferably, the X-band point frequency signal output circuit includes a third attenuator, a first frequency multiplier, a fourth attenuator, a fourth bandpass filter, a third amplifier, a fifth bandpass filter, and a fifth attenuator, which are sequentially connected. The input end of the third attenuator is connected with the second output end of the first power divider, and the output end of the third attenuator is connected with the input end of the first frequency multiplier; outputting the X-band point frequency signal through the output end of the fifth attenuator; the third to fifth attenuators and the third amplifier are used for adjusting the power of the X-band signal.
Preferably, the frequency multiplication is performed by the first frequency multiplier; the bandwidths of the fourth band-pass filter and the fifth band-pass filter are 10.2 GHz-10.8 GHz, and the stop band inhibition is < [email protected], < -62dBc@13GHz.
Preferably, the Ku band point frequency signal output circuit includes a sixth attenuator, a second frequency multiplier, a seventh attenuator, a sixth band-pass filter, a fourth amplifier, an eighth attenuator, a fifth amplifier, a third octave, a seventh band-pass filter, a sixth amplifier, an eighth band-pass filter, and a ninth attenuator, which are sequentially connected; the input end of the sixth attenuator is connected with the third output end of the first power divider, and the output end of the sixth attenuator is connected with the input end of the second frequency multiplier; outputting the Ku band point frequency signal through the output end of the ninth attenuator; the sixth to ninth attenuators and the fourth to sixth amplifiers are used to adjust Ku band signal power.
Preferably, the second frequency multiplier is used for frequency doubling, and the third frequency multiplier is used for frequency doubling; the passband range of the sixth bandpass filter is 7.7 GHz-8.1 GHz, and the stopband rejection is < [email protected], < [email protected]; the pass band ranges of the seventh and eighth band-pass filters are 15.3 GHz-15.9 GHz, and the stop band suppression is < -49dBc@13GHz and < [email protected].
Preferably, the excitation signal is a 100MHz crystal oscillator signal.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, a crystal oscillator signal is used as a reference input signal, and point frequency signals of an X wave band, a C wave band and a Ku wave band are generated at the same time;
2) The whole circuit can be integrated into a silicon-aluminum box body with the size of 40mm multiplied by 8mm, and has the advantage of small volume;
3) The invention has the advantages of low phase noise and low stray, and has good use value and popularization value.
Drawings
For a clearer description of the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are one embodiment of the present invention, and that, without inventive effort, other drawings can be obtained by those skilled in the art from these drawings:
FIG. 1 is a schematic diagram of a miniaturized low cost multi-channel low phase noise low spurious point frequency source of the present invention;
FIG. 2 is a schematic diagram of the external structure of a miniaturized low-cost multi-channel low-phase noise low-spurious-point frequency source of the present invention;
FIG. 3 is a schematic diagram of bandwidths and center frequency points of fourth and fifth bandpass filters according to the invention;
FIG. 4 is a diagram illustrating the bandwidth and center frequency of a sixth bandpass filter according to the invention;
FIG. 5 is a schematic diagram of bandwidths and center frequency points of seventh and eighth bandpass filters according to the invention;
in the figure: 1. a comb spectrum generating circuit; 11. an amplification matching circuit; 12. a step diode;
2. c wave band point frequency signal output circuit; 21. a first attenuator; 22. a first band-pass filter; 23. a first amplifier; 24. a second band-pass filter; 25. a second amplifier; 26. a third band-pass filter; 27. a first power divider; 28. a second attenuator;
3. an X-band point frequency signal output circuit; 31. a third attenuator; 32. a first frequency multiplier; 33. a fourth attenuator; 34. a fourth band-pass filter; 35. a third amplifier; 36. a fifth band-pass filter; 37. a fifth attenuator;
4. a Ku band point frequency signal output circuit; 401. a sixth attenuator; 402. a second frequency multiplier; 403. a seventh attenuator; 404. a sixth band-pass filter; 405. a fourth amplifier; 406. an eighth attenuator; 407. a fifth amplifier; 408. a third octave; 409. a seventh band-pass filter; 410. a sixth amplifier; 411. an eighth bandpass filter; 412. and a ninth attenuator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but 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.
The frequency range of the C wave band point frequency signal is 3.4 GHz-4.7 GHz, the frequency range of the X wave band point frequency signal is 8.4 GHz-12.4 GHz, and the frequency range of the Ku wave band point frequency signal is 10 GHz-12.7 GHz. As shown in fig. 1, the invention provides a miniaturized low-cost multipath low-phase-noise low-spurious-point frequency source, which can simultaneously obtain point frequency signals of C wave band, X wave band and Ku wave band. The miniaturized low-cost multipath low-phase-noise low-spurious point frequency source comprises: the comb spectrum generating circuit 1, the C-band point frequency signal output circuit 2, the X-band point frequency signal output circuit 3 and the Ku-band point frequency signal output circuit 4.
The comb spectrum generating circuit 1 generates a higher harmonic signal of an excitation signal according to the excitation signal input from the outside; in an embodiment of the present invention, the excitation signal is a 100MHz crystal oscillator signal. The comb spectrum generating circuit 1 includes: an amplification matching circuit 11 and a step diode 12; the input end of the amplifying and matching circuit is connected with the crystal oscillator signal and is used for providing a signal with low noise and stable power for the step tube; the output end of the amplifying and matching circuit is connected with the input end of the step diode, and the C-band higher harmonic signal of the crystal oscillator signal is generated through the step diode 12. In the embodiment of the present invention, the amplifying and matching circuit 11 is an NPN triode MRF581, and the step diode is MP4023.
As shown in fig. 1, the C-band dot frequency signal output circuit 2 is configured to output a C-band dot frequency signal, and includes a first attenuator 21, a first band-pass filter 22, a first amplifier 23, a second band-pass filter 24, a second amplifier 25, a third band-pass filter 26, a first power divider 27, and a second attenuator 28, which are sequentially connected.
The first attenuator input end is connected with the step diode output end, the first attenuator output end is connected with the first band-pass filter input end, the first band-pass filter output end is connected with the first amplifier input end, the first amplifier output end is connected with the second band-pass filter input end, the second band-pass filter output end is connected with the second amplifier input end, and the second amplifier output end is connected with the third band-pass filter input end. In the embodiment of the invention, the first, second and third band pass filters are selected from FBAR filters with the model of RSFKf1X000B1, the passband range is 2.58 GHz-2.62 GHz, the stopband rejection is < [email protected] and < [email protected] (corresponding to the C band), and C band harmonic signals are obtained after three times of filtering by the first to third band pass filters. The spurious suppression of the FBAR filter is 40dBc, and the spurious suppression can reach 120dBc at maximum by adopting three stages of FBAR filters. The first amplifier 23 is selected from the thirteenth institute of electronics and technology group, china, and the second amplifier 25 is selected from the thirteenth institute of electronics and technology, china, and the third amplifier is selected from the thirteenth institute of electronics and technology, NC1068C-2638, and NC10252C-204. The first and second attenuators and the first and second amplifiers are used to adjust the power of the C-band signal.
Further, the output end of the third band-pass filter is connected with the input end of the first power divider. In the embodiment of the present invention, the first power divider 27 is selected from power divider chips NC6502-203 of thirteenth institute of electronics and technology group, china. The first power divider 27 divides the C-band harmonic signal into three power division signals, which are first to third power division signals, respectively. The first power division signal is input to the second attenuator 28 through the first output end of the first power divider 27, and is subjected to power attenuation through the second attenuator 28 to generate a C-band point frequency signal; the second power division signal is input into the X-band point frequency signal output circuit 3 through the second output end of the first power divider 27, and is used for generating an X-band point frequency signal; the third power division signal is input into the Ku band point frequency signal output circuit 4 through the third output end of the first power divider 27, and is used for generating a Ku band point frequency signal. The total gain of the C-band point frequency signal output circuit 2 is 35dB, and the output power is 8dBm.
As shown in fig. 1, the X-band dot frequency signal output circuit 3 is configured to generate an X-band dot frequency signal, and includes a third attenuator 31, a first frequency multiplier 32, a fourth attenuator 33, a fourth bandpass filter 34, a third amplifier 35, a fifth bandpass filter 36, and a fifth attenuator 37, which are sequentially connected.
Wherein the input end of the third attenuator is connected with the second output end of the first power divider 27, and receives the second path of power division signal; the output end of the third attenuator is connected with the input end of the first frequency multiplier; the input end of the fourth attenuator is connected with the output end of the first frequency multiplier, the input end of the fourth band-pass filter is connected with the output end of the fourth attenuator, the input end of the third amplifier is connected with the output end of the fourth band-pass filter, the input end of the fifth band-pass filter is connected with the output end of the third amplifier, and the input end of the fifth attenuator is connected with the output end of the fifth band-pass filter. The third to fifth attenuators and the third amplifier are used for adjusting the power of the X-band signal.
The second power division signal passes through the third attenuator 31 and then is multiplied by the first frequency multiplier 32. The second power division signal after frequency multiplication is subjected to primary filtering by the fourth band-pass filter 34, the signal after the filtering by the fourth band-pass filter 34 is amplified by the third amplifier 35 and then subjected to secondary filtering by the fifth band-pass filter 36, and the signal after the filtering by the fifth band-pass filter 36 is subjected to power adjustment by the fifth attenuator 37, so that an X-band point frequency signal is finally obtained. In the embodiment of the present invention, the first frequency multiplier 32 is selected from the frequency multiplier chip NC17702C-712 of thirteenth institute of Electrical and electronics Engineers, inc. The fourth and fifth band-pass filters adopt self-imitated ceramic substrate filters, the main parameters of which are shown in figure 3, the band-pass range is 10.2 GHz-10.8 GHz, the stop band suppression is < [email protected] >, the band-pass suppression is < -62dBc@13GHz (corresponding to the X band), and the center frequency is 10.4GHz. And outputting the X-band point frequency signal through a fifth attenuator output end. The clutter in the X-band point frequency signal output circuit 3 is mainly a multiple harmonic component generated after passing through the first frequency multiplier 32, and the maximum suppression of the harmonic after frequency multiplication can reach 118dBc through two-stage filtering of the fourth and fifth band-pass filters. The third amplifier 35 is selected from the amplifier chip HMC564 of hitite in united states.
As shown in fig. 1, the Ku band dot frequency signal output circuit 4 is configured to generate a Ku band dot frequency signal, and includes a sixth attenuator 401, a second frequency multiplier 402, a seventh attenuator 403, a sixth bandpass filter 404, a fourth amplifier 405, an eighth attenuator 406, a fifth amplifier 407, a third frequency multiplier 408, a seventh bandpass filter 409, a sixth amplifier 410, an eighth bandpass filter 411, and a ninth attenuator 412, which are sequentially connected.
The third amplifier output end is connected to the fifth amplifier input end, the third frequency multiplier input end is connected to the fifth amplifier output end, the seventh band-pass filter input end is connected to the third frequency multiplier output end, the seventh band-pass filter input end is connected to the seventh attenuator output end, the fourth amplifier input end is connected to the sixth band-pass filter output end, the eighth attenuator input end is connected to the fourth amplifier output end, the fifth amplifier input end is connected to the eighth attenuator output end, the third frequency multiplier input end is connected to the fifth amplifier output end, the seventh band-pass filter input end is connected to the third frequency multiplier output end, the sixth amplifier input end is connected to the seventh band-pass filter output end, the eighth band-pass filter input end is connected to the sixth amplifier output end, and the ninth attenuator 412 input end is connected to the eighth band-pass filter output end. The sixth to ninth attenuators and the fourth to sixth amplifiers are used to adjust Ku band signal power.
The second frequency multiplier 402 is a nonlinear circuit built by beam diode MA4E2039, and the second frequency multiplier 402 is a frequency multiplier. The third frequency doubler 408 is used to double the frequency, and the third frequency doubler 408 is selected from the frequency doubler chip HMC205 of hitite in united states. The fourth and fifth amplifiers 405 and 407 are selected from the U.S. UMS amplifier chips CHA2063A-99F/00, and the sixth amplifier 410 is selected from the U.S. HITTITE amplifier chip HMC516. In the Ku band point frequency signal output circuit 4, the third power division signal (corresponding to the C band) output by the first power divider 27 is subjected to frequency multiplication of 3 times, then amplified and filtered, then subjected to frequency multiplication of 2 times, and then amplified and filtered, and output to obtain the Ku band point frequency signal. Clutter in the Ku band point frequency signal output circuit 4 is mainly multiple harmonic components generated after passing through the second and third frequency multipliers. As shown in fig. 4, the passband range of the sixth bandpass filter 404 is 7.7 GHz-8.1 GHz, and the harmonic component can be suppressed to 45dBc; as shown in fig. 5, the seventh and eighth bandpass filters are self-imitated ceramic substrate filters, the passband ranges of which are 15.3 GHz-15.9 GHz (corresponding to Ku band), the center frequency is 15.6GHz, and the harmonic component suppression can reach 49dBc.
As shown in fig. 2, the miniaturized low-cost multipath low-phase-noise low-spurious-point frequency source can be integrated into a 40mm multiplied by 8mm silicon-aluminum box body, the connecting line of the silicon-aluminum box adopts a gold wire bonding process, and the cover plate of the silicon-aluminum box is sealed by means of sintering or laser seal welding and the like.
Compared with the prior art, the point frequency source phase noise is deteriorated by 20lg (frequency multiplication number) on the basis of the phase noise of a crystal oscillator signal, and is equivalent to the PDRO of the same frequency band, the phase noise of the crystal oscillator is-148 dBc/Hz@1kHz, -160dBc/Hz@5kHz, the phase noise of a C wave band signal is less than or equal to-117 dBc/Hz@1kHz, -130dBc/Hz@5kHz, the phase noise of an X wave band signal is less than or equal to-105 dBc/Hz@1kHz, -117dBc/Hz@5kHz, and the phase noise of a Ku wave band signal is less than or equal to-102 dBc/Hz@1kHz, -114dBc/Hz@5kHz.
The clutter of the low-cost multipath low-phase-noise low-spurious-point frequency source mainly comes from the harmonic waves of the comb spectrum generator and the first to third frequency multipliers, and can be well filtered through the first to eighth band-pass filters. The point frequency source of the invention is tested, the near-end stray is not more than-90 dBc, and the far-end stray is not more than-70 dBc.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. A miniaturized, low cost, multi-channel, low phase noise, low spurious point frequency source comprising: the device comprises a comb spectrum generating circuit, a C-band point frequency signal output circuit, an X-band point frequency signal output circuit and a Ku-band point frequency signal output circuit;
the comb spectrum generating circuit generates a higher harmonic signal of an excitation signal according to the excitation signal input from the outside;
the input end of the C-band point frequency signal output circuit is connected with the output end of the comb spectrum generation circuit; the C-band point frequency signal output circuit comprises a first power divider; the input end of the X-band point frequency signal output circuit and the input end of the Ku-band point frequency signal output circuit are respectively connected with the output end of the first power divider;
the C-band point frequency signal output circuit generates a C-band point frequency signal according to the higher harmonic; the first power divider divides the power of the C-band point frequency signal into three paths of power division signals, wherein the first path of power division signals generate the C-band point frequency signal after power attenuation; the second power division signal is input into an X-band point frequency signal output circuit and is used for generating an X-band point frequency signal; the third power division signal is input into a Ku wave band point frequency signal output circuit and used for generating a Ku wave band point frequency signal.
2. The miniaturized, low-cost, multi-channel, low-phase noise, low-spurious-point frequency source of claim 1, wherein the comb spectrum generation circuit comprises: an amplifying matching circuit and a step diode; the input end of the amplifying and matching circuit is connected with the excitation signal and is used for providing a signal with low noise and stable power for the step tube; the output end of the amplifying and matching circuit is connected with the input end of the step diode, and the higher harmonic signal is generated through the step diode.
3. The miniaturized low-cost multi-channel low-phase-noise low-spurious-point-frequency source according to claim 2, wherein the C-band point-frequency signal output circuit comprises a first attenuator, a first band-pass filter, a first amplifier, a second band-pass filter, a second amplifier, a third band-pass filter, a first power divider and a second attenuator which are sequentially connected; the input end of the first attenuator is connected with the output end of the step diode, the input end of the first band-pass filter is connected with the output end of the first attenuator, and the input end of the second attenuator is connected with the first output end of the first power divider; the first attenuator and the second attenuator and the first amplifier and the second amplifier are used for adjusting the power of the C wave band signal.
4. A miniaturized low cost multi-channel low phase noise low spurious point frequency source as in claim 3 wherein the first, second and third bandpass filters each have a passband ranging from 2.58GHz to 2.62GHz with stopband rejection < [email protected], < [email protected].
5. The miniaturized low-cost multi-channel low-phase-noise low-spurious-point-frequency source according to claim 1, wherein the X-band point-frequency signal output circuit comprises a third attenuator, a first frequency multiplier, a fourth attenuator, a fourth band-pass filter, a third amplifier, a fifth band-pass filter and a fifth attenuator which are sequentially connected; the input end of the third attenuator is connected with the second output end of the first power divider, and the output end of the third attenuator is connected with the input end of the first frequency multiplier; outputting the X-band point frequency signal through the output end of the fifth attenuator; the third to fifth attenuators and the third amplifier are used for adjusting the power of the X-band signal.
6. A miniaturized, low cost, multi-path, low phase noise, low spurious point frequency source according to claim 5, wherein frequency quadrupling is performed by said first frequency multiplier; the bandwidths of the fourth band-pass filter and the fifth band-pass filter are 10.2 GHz-10.8 GHz, and the stop band inhibition is < [email protected], < -62dBc@13GHz.
7. The miniaturized low-cost multi-path low-phase-noise low-spurious-point-frequency source according to claim 1, wherein the Ku-band-point-frequency signal output circuit comprises a sixth attenuator, a second frequency multiplier, a seventh attenuator, a sixth band-pass filter, a fourth amplifier, an eighth attenuator, a fifth amplifier, a third frequency multiplier, a seventh band-pass filter, a sixth amplifier, an eighth band-pass filter, and a ninth attenuator, which are sequentially connected; the input end of the sixth attenuator is connected with the third output end of the first power divider, and the output end of the sixth attenuator is connected with the input end of the second frequency multiplier; outputting the Ku band point frequency signal through the output end of the ninth attenuator; the sixth to ninth attenuators and the fourth to sixth amplifiers are used to adjust Ku band signal power.
8. The miniaturized low cost multi-channel low phase noise low spurious point frequency source of claim 7 wherein frequency tripled by said second frequency multiplier and frequency doubled by said third frequency multiplier; the passband range of the sixth bandpass filter is 7.7 GHz-8.1 GHz, and the stopband rejection is < [email protected], < [email protected]; the pass band ranges of the seventh and eighth band-pass filters are 15.3 GHz-15.9 GHz, and the stop band suppression is < -49dBc@13GHz and < [email protected].
9. The miniaturized, low cost, multi-channel, low phase noise, low spurious point frequency source of claim 1 wherein the excitation signal is a 100MHz crystal oscillator signal.
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| CN113541687B (en) * | 2021-08-20 | 2024-06-21 | 成都西蒙电子技术有限公司 | Low phase noise narrowband frequency synthesizer |
| CN115701888B (en) * | 2023-01-05 | 2023-05-05 | 成都鸿启兴电子科技有限公司 | Microwave frequency source and microwave equipment |
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