CN113726334B - S-band low-phase-noise low-stray fine stepping frequency source assembly and use method - Google Patents
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- H—ELECTRICITY
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- 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
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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Abstract
The invention discloses an S-band low-phase-noise low-spurious fine stepping frequency source component and a use method thereof, wherein the frequency source component comprises a constant-temperature crystal oscillator, a comb spectrum circuit, a first filter, a power divider, a mixer, a second filter, a frequency divider and a phase-locked loop circuit which are sequentially connected, one output end of the power divider is connected with a local oscillation input end of the mixer, the other output end of the power divider is connected with an intermediate frequency input end of the mixer through a DDS circuit, and the phase-locked loop circuit comprises a phase discriminator, a loop filter and a voltage-controlled oscillator which are sequentially and annularly connected. The invention adopts a mixed frequency synthesis mode combining direct analog synthesis, direct digital synthesis and indirect digital phase-locked synthesis, has simple integral structure and reasonable design, and simultaneously effectively realizes low phase noise, low spurious and ultra-small frequency hopping stepping indexes.
Description
Technical Field
The invention relates to the technical field of radio frequency microwaves, in particular to an S-band low-phase-noise low-stray fine stepping frequency source assembly and a use method thereof.
Background
In the field of radio frequency microwaves, the frequency synthesis technology is an important technology in the design of internal electronic systems such as radar reconnaissance, aerospace measurement and control, wireless communication and the like; among these, the need for low phase noise, low spurious, and ultra-small frequency hopping steps for frequency source components that achieve frequency synthesis is becoming more and more stringent.
There are many designs of frequency source components, but these do not combine low phase noise, low spurious and ultra-small frequency hopping steps. For example, a single method of direct analog synthesis is adopted, so that low-phase noise indexes are relatively easy to obtain, but ultra-small frequency hopping steps and high spurious suppression indexes are often not easy to make; the single method of direct digital synthesis is adopted, so that low-phase noise index and ultra-fine small stepping signals are easy to obtain, but the frequency of the signals is low, and the bandwidth is narrow; it is also difficult to simultaneously meet the ultra-small frequency hopping step and high spurious suppression indexes by adopting indirect phase-locked frequency synthesis singly.
The Chinese patent publication No. CN209105149U, 7 months and 12 days of publication day 2019 discloses a small-volume superfine stepping low-phase noise ultra-high spurious suppression frequency source, and the crystal oscillator module is provided with a first mixing filter which is respectively connected with a direct synthesis high-stability reference device through a DDS, the first mixing filter is connected with a built-in R frequency divider through a frequency dividing filter, the built-in R frequency divider is connected with a main phase-locked loop device, the main phase-locked loop device is respectively connected with a voltage-controlled oscillator through a loop filter and a second mixing filter, and the second mixing filter is connected with a mixing reference module. The prior art has a complex structure, the frequency stability is general, meanwhile, the crystal oscillator module is directly connected with the first mixing filter through the DDS and the direct synthesis high-stability reference device, and the corresponding realization effect of the subsequent low-phase noise, low spurious and ultra-small frequency hopping stepping indexes is also general.
Disclosure of Invention
The invention aims to provide an S-band low-phase-noise low-spurious fine stepping frequency source assembly and a use method thereof, which are used for solving the technical problems that the existing frequency source assembly provided in the background art is complex in structure and general in frequency stability, and the low-phase-noise low-spurious and ultra-small frequency hopping stepping indexes cannot be realized at the same time.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a low phase noise of S wave band low spurious fine stepping frequency source subassembly, includes constant temperature crystal oscillator, comb spectrum circuit, first wave filter, merit divide ware, mixer, second wave filter, frequency divider and phase-locked loop circuit that links to each other in proper order, phase-locked loop circuit includes annular phase discriminator, loop filter and the voltage-controlled oscillator that links to each other in order.
The output end of the constant-temperature crystal oscillator is connected with the input end of the comb spectrum circuit, the output end of the comb spectrum circuit is connected with the input end of the first filter, the output end of the first filter is connected with the input end of the power divider, one output end of the power divider is connected with the local oscillation input end of the mixer, the other output end of the power divider is connected with the intermediate frequency input end of the mixer through the DDS circuit, the output end of the mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the frequency divider, the output end of the frequency divider is connected with one input end of the phase discriminator, the other input end of the phase discriminator is connected with one output end of the voltage controlled oscillator, the other output end of the voltage controlled oscillator is the signal output end of the S-band frequency source, the output end of the phase discriminator is connected with the input end of the loop filter, and the output end of the loop filter is connected with the input end of the voltage controlled oscillator.
The invention also provides a use method of the S-band low-phase-noise low-stray fine stepping frequency source assembly, which comprises the following specific operation steps:
1) The constant-temperature crystal oscillator oscillates to generate a first reference signal, and the first reference signal is sent to the comb spectrum circuit to generate a comb spectrum signal with the same frequency as the first reference signal and output the comb spectrum signal;
2) After spurious is filtered and enlarged by the first filter, the comb spectrum signal is generated into a second signal which is frequency-doubled by the comb spectrum signal, the second signal is divided into two paths of output by the power divider, one path of output is provided for the DDS circuit to serve as a reference clock and generate an intermediate frequency signal, and the other path of output is provided for the mixer to serve as a local oscillation signal;
3) Mixing the intermediate frequency signal and the local oscillation signal through a mixer, filtering spurious emissions through a second filter, and generating an L-band reference signal after the spurious emissions are enlarged;
4) The L-band reference signal is sent to a frequency divider for frequency division, and a low-frequency signal is generated and used as a phase discrimination reference signal;
5) And feeding the radio frequency signal of the voltage-controlled oscillator back to the phase discriminator, comparing the radio frequency signal with the low frequency signal of the frequency divider, outputting a low frequency error signal, sending the low frequency error signal to the loop filter, filtering the low frequency error signal by the loop filter, and outputting a low frequency direct current signal to tune the voltage-controlled oscillator to form a loop, thereby completing phase locking.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a mixed frequency synthesis mode combining direct analog synthesis, direct digital synthesis and indirect digital phase-locked synthesis, generates an L-band reference signal through the direct analog synthesis and the direct digital synthesis mode, generates a final S-band frequency source through the indirect digital phase-locked synthesis mode after the L-band reference signal is divided, has simple integral structure and reasonable design, and simultaneously effectively realizes low phase noise, low spurious and ultra-small frequency hopping stepping indexes;
2. according to the invention, a first reference signal generated by constant-temperature crystal oscillator oscillation is sequentially divided into two paths to be output through the comb spectrum circuit, the first filter and the power divider, the local oscillator signal and the DSS clock are both derived from the comb spectrum circuit, the comb spectrum generator circuit can generate relatively flat and stable comb spectrum signals, meanwhile, filtering expansion processing is uniformly performed in advance before power divider output, the overall processing effect in the early stage of mixing is good, the realization of low phase noise, low spurious and ultra-small frequency hopping stepping indexes is further ensured, and the frequency stability of an S-band frequency source finally output is improved;
3. according to the invention, the first reference signal is generated by adopting the constant-temperature crystal oscillator oscillation, so that the frequency stability of the generated first reference signal is greatly improved.
Drawings
Fig. 1 is a block diagram of the module of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings:
as shown in FIG. 1, an S-band low-phase-noise low-spurious fine stepping frequency source assembly comprises a constant-temperature crystal oscillator, a comb spectrum circuit, a first filter, a power divider, a mixer, a second filter, a frequency divider, a phase discriminator, a loop filter and a voltage-controlled oscillator, wherein the output end of the constant-temperature crystal oscillator is connected with the input end of the comb spectrum circuit, the output end of the comb spectrum circuit is connected with the input end of the first filter, the output end of the first filter is connected with the input end of the power divider, the power divider is divided into two paths of outputs, one output end of the power divider is connected with the local oscillation input end of the mixer, the other output end of the power divider is connected with the intermediate frequency input end of the mixer through the DDS circuit, the output end of the mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the frequency divider, the output end of the frequency discriminator is connected with the input end of the loop filter, the output end of the loop filter is connected with the input end of the voltage-controlled oscillator, and the output end of the other signal of the phase divider is connected with the output end of the S-band oscillator.
The application method of the band low-phase-noise low-stray fine stepping frequency source component comprises the following specific operation steps:
firstly, an external constant-temperature crystal oscillator oscillates to generate a reference signal of 100MHz, the reference signal is sent to a comb spectrum circuit, after the comb spectrum signal of 100MHz is generated, spurious emissions are filtered and expanded through a first filter, and a signal of 1200MHz with a high spurious suppression degree is generated; then, the 1200MHz signal is divided into two paths of output through the power divider, one path of the signal is provided for the DDS circuit to serve as a reference clock, and the other path of the signal is provided for the mixer to serve as a local oscillation signal; meanwhile, the DDS circuit generates a section of narrow-range fine stepping intermediate frequency signal, the frequency range of the intermediate frequency signal is 129-159MHz, the intermediate frequency signal is mixed with the local oscillator signal through a mixer, spurious emissions are filtered and enlarged through a second filter, and then an L-band reference signal of 1041-1071MHz with a very high spurious suppression degree is generated; then, the L-band reference signal is sent to a frequency divider for frequency division to generate a 260.25-267.75 MHz low-frequency signal which is used as a phase discrimination reference signal; and finally, feeding back the radio frequency signal of the voltage-controlled oscillator to the phase discriminator, comparing the radio frequency signal with the low frequency signal of the frequency divider, outputting a low frequency error signal, sending the low frequency error signal to the loop filter, filtering the low frequency error signal by the loop filter, and outputting a low frequency direct current signal to tune the voltage-controlled oscillator to form a loop, completing the phase locking function, and synthesizing the S-band frequency source of 1800-2400 MHz.
The L-band reference signal is generated by mixing a local oscillator signal and a DDS intermediate frequency signal, the local oscillator signal and the DDS clock are both from a comb spectrum circuit, the phase noise of the L-band reference signal is very low, and the phase noise of the L-band reference signal and the crystal oscillator signal meet the relation of 20 lgN; the L-band reference signal is divided and then a final S-band frequency source is generated through an indirect digital phase locking synthesis mode, the phase locking mode is an integer mode, the noise contribution of the phase discriminator is low, the noise contribution of the L-band reference signal is lower than that of the subsequent 8-phase discriminator, and therefore the phase noise of the finally output S-band frequency source directly depends on the noise bottom of the phase discriminator, and the low-noise phase discriminator is selected, so that the low-phase noise requirement of the S-band frequency source can be met.
The frequency hopping step of the intermediate frequency signal output by the DDS circuit meets the mu Hz level, and the near-end stray index is high; in summary, because the L-band reference signal is generated by mixing the local oscillation signal and the DDS intermediate frequency signal, the near-end spurious signal of the L-band reference signal mainly depends on the near-end spurious of the intermediate frequency signal output by the DDS circuit, which is better than 85dBc; and the frequency hopping step of the L-band reference signal also depends on the frequency hopping step of the intermediate frequency signal output by the DDS circuit, thereby meeting the mu Hz level. The L-band reference signal and the finally output S-band frequency source meet the relation of 20 lgN; therefore, the near-end spurious of the S-band frequency source depends only on the L-band reference signal, deteriorating by 6dB, 79dBc; and the frequency modulation step of the S-band frequency source also depends on the L-band reference signal, and meets the mu Hz level.
Finally, typical phase noise for S-band frequency sources: -115 dBc@10K-300 KHz; stray: -75dBc; frequency hopping step: the frequency source signal has low phase noise, low spurs and fine steps < 0.1 Hz.
Claims (8)
1. The utility model provides a S wave band low phase noise low spurious thin step frequency source subassembly, includes phase-locked loop circuit, its characterized in that still includes constant temperature crystal oscillator, comb spectrum circuit, first wave filter, merit divide ware, mixer, second wave filter and the frequency divider that links to each other in proper order, one output of merit divide the ware and the local oscillator input of mixer link to each other, another output of merit divide the ware links to each other with the intermediate frequency input of mixer through DDS circuit, the output of frequency divider links to each other with phase-locked loop circuit, phase-locked loop circuit includes phase discriminator, loop filter and the voltage-controlled oscillator that links to each other in order cyclic annular.
2. The S-band low-phase noise low-spurious fine stepping frequency source assembly of claim 1, wherein an output of the thermostatic crystal oscillator is connected to an input of a comb spectrum circuit, an output of the comb spectrum circuit is connected to an input of a first filter, and an output of the first filter is connected to an input of a power divider.
3. An S-band low-phase noise low-spurious fine stepping frequency source assembly according to claim 2, wherein the output of said mixer is connected to the input of a second filter, the output of said second filter being connected to the input of the frequency divider.
4. An S-band low-phase noise low-spurious fine stepping frequency source assembly according to claim 3, wherein the output of the frequency divider is connected to one input of a phase detector, the other input of the phase detector is connected to one output of a voltage controlled oscillator, and the other output of the voltage controlled oscillator is the signal output of the S-band frequency source.
5. An S-band low phase noise low spurious fine stepping frequency source assembly according to claim 4, wherein said phase detector output is connected to an input of a loop filter, said loop filter output being connected to an input of a voltage controlled oscillator.
6. A method of using an S-band low phase noise low spurious fine stepping frequency source assembly as defined in any one of claims 1-5, comprising the steps of:
1) The constant-temperature crystal oscillator oscillates to generate a first reference signal, and the first reference signal is sent to the comb spectrum circuit to generate a comb spectrum signal for output;
2) After spurious signals are filtered and expanded by the first filter, a second signal is generated, the second signal is divided into two paths of output through the power divider, one path of output is provided for the DDS circuit to serve as a reference clock and generate an intermediate frequency signal, and the other path of output is provided for the mixer to serve as a local oscillation signal;
3) Mixing the intermediate frequency signal and the local oscillation signal through a mixer, filtering spurious emissions through a second filter, and generating an L-band reference signal after the spurious emissions are enlarged;
4) The L-band reference signal is sent to a frequency divider for frequency division, and a third signal is generated and used as a phase discrimination reference signal;
5) And feeding the radio frequency signal of the voltage-controlled oscillator back to the phase discriminator, comparing the radio frequency signal with the low frequency signal of the frequency divider, outputting a low frequency error signal, sending the low frequency error signal to the loop filter, filtering the low frequency error signal by the loop filter, and outputting a low frequency direct current signal to tune the voltage-controlled oscillator to form a loop, thereby completing phase locking.
7. The method of claim 6, wherein the comb spectrum signal is co-frequency with the first reference signal.
8. The method of claim 7, wherein the second signal is frequency-doubled relative to the comb spectrum signal.
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| CN114070302B (en) * | 2022-01-17 | 2022-04-08 | 中国电子科技集团公司第二十九研究所 | Broadband fine stepping frequency synthesis circuit and method |
| 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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