CN105634410A - Radio frequency down-conversion channel apparatus - Google Patents
Radio frequency down-conversion channel apparatus Download PDFInfo
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- CN105634410A CN105634410A CN201410677777.1A CN201410677777A CN105634410A CN 105634410 A CN105634410 A CN 105634410A CN 201410677777 A CN201410677777 A CN 201410677777A CN 105634410 A CN105634410 A CN 105634410A
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Abstract
The present invention discloses a radio frequency down-conversion channel apparatus. The apparatus includes a down-converter, a reference crystal oscillator, a phase detector, a loop filter and a voltage controlled oscillation circuit. The first input end of the down-converter is connected with a radio frequency carrier input, and the down-converter is used for generating a medium frequency signal according to the radio frequency carrier input and an output of a local oscillation circuit. The first input end of the phase detector is connected with the output end of the down-converter, the second input end of the phase detector is connected with the reference crystal oscillator, and the phase detector is used for generating a direct current voltage corresponding to a frequency difference between the frequency of the medium frequency signal and the frequency of the reference crystal oscillator. The input end of the loop filter is connected with the first output end of the phase detector. The input end of the voltage controlled oscillation circuit is connected with the output end of the loop filter, and the voltage controlled oscillation circuit is used for generating a radio frequency signal according to the direct current voltage output by the loop filter and feeding the radio frequency signal back to the second input end of the down-converter. According to the radio frequency down-conversion channel apparatus, the radio frequency carrier with frequency offset is captured.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of radio frequency down-conversion lane device.
Background technology
In the microwave radio communications field, instability due to the effect of Doppler frequency shift and radio frequency transmitting channel link medium frequency source, can cause radiofrequency signal that RF emission system sends to radio frequency down-conversion receive system time, radio frequency carrier frequency produces bigger frequency departure compared with setting carrier frequency. The produced frequency difference of said frequencies deviation can directly result in the frequency difference of radio frequency down-conversion output IF-FRE and predetermined value, if frequency difference is excessive produced by frequency departure, then will cause that demodulation performance during intermediate frequency demodulation declines, system mark Error Vector Magnitude (ErrorVectorMagnitude, referred to as EVM) index worsens.
In the related, for the impact overcoming frequency departure to bring, the frequency difference calculating carrier frequency in advance would generally be shifted to an earlier date in the application, carry out frequency compensation when circuit design in advance, by corresponding with the input radio frequency carrier wave producing frequency deviation for the local frequency receiving down coversion passage; Or directly all adopt the frequency source of high stability at transceiving radio frequency passage, adopt Digital Phase-Locked Loop Technology simultaneously when intermediate frequency demodulation, frequency offset signal is locked onto default intermediate frequency place, eliminate carrier frequency and deviate the impact brought.
In radio frequency machine system equipment, the complicated spurious signal in electromagnetic environment is fallen in reception signal bandwidth will raise in-band noise background, thus causing that the sensitivity of radio-frequency transmitter complete machine declines, worsen the link signal to noise ratio of input radio frequency front end simultaneously. The Electro Magnetic Compatibility index overall in order to meet radio-frequency transmitter, improve machine sensitivity, improve the anti-interference of radio-frequency front-end, when keeping system intermediate-frequency bandwidth constant, generally consider improve the Out-of-band rejection of radio frequency front-end filter or reduce total noise of centrifuge coefficient, radiofrequency signal band stray is made not make radio-frequency front-end saturated, and the non-linear intermodulation parameter brought of band stray to fall the parameter received in the signal bandwidth end lifting that do not make to make an uproar a lot, being simultaneously entered Noise Background can be low as much as possible. But in radio-frequency front-end cavity body filter index with volume is limited and total noise of centrifuge coefficient optimizes under limited restriction, improve the performance just comparatively difficulty of the EMC of radio frequency receiver parts. How to ensure that the band stray of radio-frequency front-end suppresses to become the problem needing to consider.
For correlation technique being avoided radio-frequency carrier frequency deviation and improving the problem of the spuious EMC characteristic of radio-frequency front-end, effective solution is not yet proposed at present.
Summary of the invention
For the problem of radio-frequency carrier frequency deviation in correlation technique, the invention provides a kind of radio frequency down-conversion lane device, at least to solve the problems referred to above.
According to the present invention, it is provided that a kind of radio frequency down-conversion lane device, including:
Low-converter, the first input end of described low-converter is connected with radio-frequency carrier input, for producing intermediate-freuqncy signal according to the output of the input of described radio-frequency carrier and described local oscillation circuit;
With reference to crystal oscillator;
Phase discriminator, the first input end of described phase discriminator is connected with the outfan of described low-converter, second input of described phase discriminator is connected with reference to crystal oscillator with described, for producing the DC voltage corresponding with the frequency difference between the frequency of described intermediate-freuqncy signal and the described frequency with reference to crystal oscillator;
Loop filter, the input of described loop filter is connected with the first outfan of described phase discriminator;
Voltage-Controlled oscillation circuit, the input of described Voltage-Controlled oscillation circuit is connected with the outfan of described loop filter, DC voltage for exporting according to described loop filter generates radiofrequency signal, and by the second input of described radio frequency signal feedback to described low-converter.
Alternatively, described Voltage-Controlled oscillation circuit is phase noise.
Alternatively, described Voltage-Controlled oscillation circuit, including: VCXO, the input of described VCXO is connected with the outfan of described loop filter; Phase-locked loop circuit, the input of described phase-locked loop circuit is connected with the outfan of described VCXO, and the outfan of described phase-locked loop circuit is connected with the second input of described low-converter.
Alternatively, described Voltage-Controlled oscillation circuit, including: VCXO, the input of described VCXO is connected with the outfan of described loop filter; First phase-locked loop circuit, the input of described first phase-locked loop circuit is connected with the outfan of described VCXO, for producing the radiofrequency signal of first frequency; Second phase-locked loop circuit, the input of described second phase-locked loop circuit is connected with the outfan of described VCXO, for producing the radiofrequency signal of raw second frequency; Frequency mixer, the first input end of described frequency mixer and the outfan of the first phase-locked loop circuit are connected, second input of described frequency mixer is connected with the outfan of described second phase-locked loop circuit, and the outfan of described frequency mixer is connected with the second input of described low-converter.
Alternatively, also including between described low-converter and described phase discriminator: the first image-reject filter, the input of described first image-reject filter is connected with the outfan of described low-converter; First amplifier, the input of described first amplifier is connected with the outfan of described first image-reject filter, and the outfan of described first amplifier is connected with the first input end of described phase discriminator.
Alternatively, also including between described low-converter and described frequency mixer: the second image-reject filter, the input of described second image-reject filter is connected with the outfan of described frequency mixer; Second amplifier, the input of described second amplifier is connected with the outfan of described second image-reject filter, and the outfan of described second amplifier is connected with the first input end of described low-converter.
Alternatively, the second outfan of described phase discriminator, it is connected with demodulation circuit of intermediate frequency, is used for exporting lock indication signal.
By the present invention, realize the local frequency tracking to radio frequency incoming carrier frequency deviation by the carrier track phaselocked loop in the radio frequency down-conversion passage of analog form, it is achieved to the catching of radio-frequency carrier having frequency deviation.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 is the schematic diagram of radio frequency down-conversion lane device according to embodiments of the present invention;
Fig. 2 is the schematic diagram of preferred radio frequency down-conversion lane device according to embodiments of the present invention;
Fig. 3 is the schematic diagram of another preferred radio frequency down-conversion lane device according to embodiments of the present invention; And
Fig. 4 is the schematic diagram of another preferred radio frequency down-conversion lane device according to embodiments of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments. It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
Fig. 1 is the schematic diagram of radio frequency down-conversion lane device according to embodiments of the present invention, as it is shown in figure 1, this device includes:
Low-converter 1, the first input end of low-converter 1 is connected with radio-frequency carrier input, for producing intermediate-freuqncy signal according to the output of the input of described radio-frequency carrier and described local oscillation circuit;
With reference to crystal oscillator 2;
Phase discriminator 3, the first input end of phase discriminator 3 is connected with the outfan of low-converter 1, second input of phase discriminator 3 is connected with reference crystal oscillator 2, for producing the DC voltage corresponding with the frequency difference between the frequency of described intermediate-freuqncy signal and the described frequency with reference to crystal oscillator;
Loop filter 4, the input of loop filter 4 is connected with the first outfan of phase discriminator 3;
Voltage-Controlled oscillation circuit 5, the input of Voltage-Controlled oscillation circuit 5 is connected with the outfan of loop filter 4, for generating radiofrequency signal according to the DC voltage of loop filter 4 output, and by the second input of radio frequency signal feedback to low-converter 1.
In an embodiment of the embodiment of the present invention, Voltage-Controlled oscillation circuit 5 can be phase noise.
In another embodiment of the embodiment of the present invention, Voltage-Controlled oscillation circuit 5 may include that VCXO, and the input of VCXO is connected with the outfan of loop filter 4; Phase-locked loop circuit, the input of phase-locked loop circuit is connected with the outfan of VCXO, and the outfan of phase-locked loop circuit is connected with the second input of low-converter.
Fig. 2 is the schematic diagram of preferred radio frequency down-conversion lane device according to embodiments of the present invention, as in figure 2 it is shown, Voltage-Controlled oscillation circuit 5, including: VCXO 51, the input of VCXO 51 is connected with the outfan of loop filter 4; First phase-locked loop circuit 52, the input of the first phase-locked loop circuit 52 is connected with the outfan of VCXO 51, for producing the radiofrequency signal of first frequency; Second phase-locked loop circuit 53, the input of the second phase-locked loop circuit 53 is connected with the outfan of VCXO 51, for producing the radiofrequency signal of raw second frequency; Frequency mixer 54, the first input end of frequency mixer 54 and the outfan of the first phase-locked loop circuit 42 are connected, and the second input of frequency mixer 54 and the outfan of the second phase-locked loop circuit 53 are connected, and the outfan of frequency mixer 54 is connected with the second input of low-converter 1.
Voltage-Controlled oscillation circuit as shown in Figure 2, first frequency and second frequency one are high frequency one is low frequency, the phaselocked loop that output frequency is higher easily realizes altofrequency stepping, the relatively low phaselocked loop of output frequency easily realizes low frequency stepping, can complete the output of high step frequency at upper frequency and also can complete the output of low step frequency after both parallel signal mixing.
Fig. 3 is the schematic diagram of another preferred radio frequency down-conversion lane device according to embodiments of the present invention, as shown in Figure 3, also including between low-converter 1 and phase discriminator 2: the first image-reject filter 6, the input of the first image-reject filter 6 is connected with the outfan of low-converter 1; First amplifier 7, the input of the first amplifier 7 and the outfan of the first image-reject filter 6 are connected, and the outfan of the first amplifier 7 is connected with the first input end of phase discriminator 2.
Also including between low-converter 1 and frequency mixer 54: the second image-reject filter 8, the input of the second image-reject filter 8 is connected with the outfan of frequency mixer 54; Second amplifier 9, the input of the second amplifier 9 and the outfan of the second image-reject filter 8 are connected, and the outfan of the second amplifier 9 is connected with the first input end of low-converter 1.
Second outfan of phase discriminator, is connected with demodulation circuit of intermediate frequency, is used for exporting lock indication signal. Alternatively, if carrier radio frequency incoming frequency within the scope of local oscillator tracking frequency and carrier tracking loop lock, then feeds back to the instruction of demodulation circuit of intermediate frequency high level, demodulation circuit of intermediate frequency completes the process to intermediate-freuqncy signal; If carrier radio frequency incoming frequency is outside local oscillator tracking frequency scope, then feeding back to the instruction of demodulation circuit of intermediate frequency low level, down coversion now is obtained intermediate-freuqncy signal and does not process by demodulation circuit of intermediate frequency.
Below the optional embodiment of the embodiment of the present invention is described.
Alternative embodiment one
Fig. 4 is the schematic diagram of another preferred radio frequency down-conversion lane device according to embodiments of the present invention, below in conjunction with Fig. 4, the embodiment of the present invention is described.
Radio-frequency carrier input accesses one-level low-converter U1, and this low-converter can filter image interference by cascading filter after selecting image-reject mixer or common frequency mixer and realize. Low-converter U1 output is intermediate-freuqncy signal, and it realizes variable gain by a gain-controlled amplifier U2 and amplifies, it is ensured that the radiofrequency signal input of different amplitudes can be amplified to same level value in output.
Here gain-controlled amplifier can pass through integrated chip or bonder, cymoscope, operational amplifier, electrically controlled attenuator combination realization. And gain-controlled amplifier needs to consider the response time of itself, this time can regulate by arranging the loop devices of gain-controlled amplifier.
Intermediate frequency one tunnel after gain-controlled amplifier U2 amplifies exports to follow-up IF process, and a road is as treating to be input to by the signal of loop phase discriminator U3 frequency stabilization the crystal oscillator U4 being referenced as a high stability of loop phase discriminator U3, loop phase discriminator U3. This loop phase discriminator U3 locking frequency is the IF-FRE that down coversion obtains, and reference frequency is set to the crystal oscillator output frequency of high stability, it is possible to selects common serial paralled interface to control phase discriminator chip and realizes. The direct voltage output of phase discriminator U3 requires over loop filter and to the noise filtering on loop and arranges certain loop parameter, owing to choosing the feature of phase discriminator here, consider that its output phase demodulation controls voltage maximum magnitude and controls the maximum of voltage more than adjustable crystal oscillator U6, therefore choose passive loop filter.
Phase demodulation output voltage controls adjustable crystal oscillator U6 after loop filter, adjustable crystal oscillator U6 is re-used as two frequencies of parallel connection and combines phase discriminator U9 in phaselocked loop, the reference of U10, here can by adjustable crystal oscillator U6, phase discriminator U9, U10, local oscillator frequency combines U7, U8 and frequency are combined frequency mixer U11 and are considered as community's frequency source, the tuning sensitivity that the tuning sensitivity of this frequency source is adjustable crystal oscillator U6 is multiplied by the comprehensive U7 of local oscillator frequency, Clock Multiplier Factor between U8 output frequency and crystal oscillator U6 frequency, the tuning sensitivity value of this frequency source is used for determining the component values of concrete passive loop filter U5. the output valve of community's frequency source is amplified and provided to low-converter U1, completes analog carrier and follow the tracks of the closed loop of phaselocked loop. in the circuit, the image frequency produced after relevant image-reject filter suppresses mixing can be added after frequency mixer used.
Alternative embodiment two
With reference to Fig. 4, realize the local frequency tracking to radio frequency incoming carrier frequency deviation by the carrier track phaselocked loop in the radio frequency down-conversion passage of analog form, it is achieved to the catching of radio-frequency carrier having frequency deviation. A front end band pass filters can be equivalent to by carrier track phaselocked loop tracking characteristics within the scope of certain frequency and filter the band stray of radio-frequency input signals, radio-frequency front-end spurious reduction and EMC characteristic can be improved.
In embodiments of the present invention, the basis of frequency conversion channel introduces the carrier track phaselocked loop of analog form at radio frequencies, realized by the characteristic of carrier track phaselocked loop filtering outside carrier frequency tracking and carrier band. Whole channel circuit adopts down coversion form, radio-frequency carrier signal is converted to IF-FRE, then passes through AGC and carry out automatic growth control, stablize its output. The road that intermediate frequency exports is input to the manipulated signal end of phase discriminator simultaneously, using the output of high stability crystal oscillator as the reference input frequency signal of phase discriminator, the output of phase discriminator is by controlling with reference to adjustable crystal oscillator after loop filter, the output of crystal oscillator is supplied to phaselocked loop in parallel below and produces two frequencies of height, as the local oscillator of whole link down coversion after two frequencies complete mixing amplification, form track loop.
When the required mid frequency of radio frequency incoming carrier deviation, intermediate frequency that down coversion passage converts out and high stability crystal oscillator U4 by phase discriminator U3 obtain between DC voltage corresponding to frequency difference, this DC voltage arranges the adjustable crystal oscillator U6 of lower control in the parameter of passive loop filter U5, and the output of its crystal oscillator frequency combines the reference frequency of U7, U8 as local oscillator frequency. The function that the comprehensive U7 of local oscillator frequency, U8, phase discriminator U9, U10 realize is: be divided into two height frequency signals by needing the local oscillator tracking frequency signal produced, one higher frequency signals is formed phaselocked loop by the loop filter of local oscillator frequency comprehensive U7, phase discriminator U9 and correspondence and produces, and this frequency signal can produce bigger frequency step by arranging of loop filter; The loop filter that another low frequency signals is combined U8, phase discriminator U10 and correspondence by local oscillator frequency forms phaselocked loop generation, and this frequency signal can produce less frequency step by arranging of loop filter. The frequency signal produced by two phaselocked loops in parallel is combined frequency mixer U11 by frequency and is produced Spectrum synthesizing, completes the local oscillator tracking frequency signal output of required frequency step. This output frequency changes with the change of adjustable crystal oscillator U6, then local frequency just can follow the tracks of the radio frequency incoming carrier frequency of off-center frequency by certain step frequency, obtain the intermediate-freuqncy signal of stable frequency, both complete frequency down conversion change by low-converter U1, and obtained intermediate-freuqncy signal amplifies output by gain-controlled amplifier U2 mono-tunnel, a road is supplied to phase discriminator U3 and completes phaselocked loop closed loop.
In embodiments of the present invention, the radio-frequency carrier that certain frequency offsets is had to be input in passage, the intermediate frequency having certain frequency to offset is obtained by down coversion, this intermediate frequency passes through carrier wave simulation tracing phaselocked loop by high stability with reference to crystal oscillator frequency stabilization, itself and high stability utilize the local oscillator frequency that the phase demodulation Control of Voltage analog carrier that phase discriminator obtains is followed the tracks of in phaselocked loop to combine output with reference to crystal oscillator, it is formed with the local oscillator frequency consistent with above-mentioned input radio frequency carrier beat and combines output, completing carrier track, intermediate frequency output frequency is stable. Radio frequency incoming carrier in certain frequency bandwidth is had tracking ability by carrier track phaselocked loop, and the radio frequency incoming frequency outside frequency bandwidth then can not be tracked, phaselocked loop losing lock, feeds back to demodulation circuit of intermediate frequency and does not carry out relevant treatment. Its one radio frequency front-end filter with certain bandwidth of equivalence, filter bandwidht is the radio frequency incoming carrier band limits that can follow the tracks of, and it is equal to the maximum magnitude being combined U7, U8, phase discriminator U9, U10, frequently the local oscillation circuit changeable frequency that the loop filter of comprehensive frequency mixer U11 and correspondence forms in carrier track phaselocked loop by adjustable crystal oscillator U6, local oscillator frequency. This equivalence filter is due to the characteristic of phaselocked loop, and its Out-of-band rejection and the outer squareness factor of wave filter band are significantly high, it is possible to suppress the frequency signal outside track band very well
When the intermediate frequency that design down coversion obtains and high stability crystal oscillator U4 carry out phase demodulation, it is necessary to choose the phase discriminator chip with locking deictic function. Need the lock indication signal of phase discriminator is fed back to demodulation circuit of intermediate frequency part, if carrier radio frequency incoming frequency is within the scope of local oscillator tracking frequency and carrier tracking loop lock, then feeding back to the instruction of demodulation circuit of intermediate frequency high level, demodulation circuit of intermediate frequency completes the process to intermediate-freuqncy signal; If carrier radio frequency incoming frequency is outside local oscillator tracking frequency scope, then feeding back to the instruction of demodulation circuit of intermediate frequency low level, down coversion now is obtained intermediate-freuqncy signal and does not process by demodulation circuit of intermediate frequency.
In embodiments of the present invention, the phase discriminator U3 in carrier track phaselocked loop adopts fractional frequency division device, it is ensured that the small frequency stepping realization under high phase comparison frequency, the phase demodulation frequency of U3 phase discriminator takes consistent with high stability U4 crystal oscillator frequency (such as 10MHz), it is ensured that making an uproar mutually of generation is less, the loop bandwidth that passive loop filter U5 is arranged is big as much as possible under ensureing steadiness, it is possible to obtain less loop-locking time and frequency-tracking time, the adjustable frequency selection range of adjustable crystal oscillator U6 needs to ensure can completely receive frequency conversion in wanted carrier signal frequency bandwidth, and the outer radio frequency signal frequency of useless band can be filtered out, local oscillation circuit is by adjustable crystal oscillator U6, local oscillator frequency combines U7, U8, phase discriminator U9, U10, frequency combines frequency mixer U11 and corresponding loop filter composition, wherein local oscillator frequency combines U7, phase discriminator U9 is arranged in the high-frequency phase-locked loop of generation, and local oscillator frequency combines U8, phase discriminator U10 is arranged in the low-frequency phase-locked loop of generation, the frequency of two phase-locked loop in parallel generations is combined frequency mixer U11 place at frequency and is completed spectral change, complete the output of required local oscillator, the advantage of this design is in that the phaselocked loop that output frequency is higher easily realizes altofrequency stepping, the relatively low phaselocked loop of output frequency easily realizes low frequency stepping, can can complete the output of high step frequency at upper frequency after the mixing of both parallel signal and also can complete the output of low step frequency, more simple than directly realizing low frequency stepping in altofrequency output phaselocked loop, this vibration magnifier U12 completes the amplification of local oscillation signal so that it is reach this amplitude requirement of low-converter U1, the response time of gain-controlled amplifier U2 (such as AD8367) needs little as much as possible, it is ensured that the whole loop-locking time.
In from the description above, can be seen that, present invention achieves following technique effect: compare existing radio frequency down-conversion implementation, the embodiment of the present invention is followed the tracks of phaselocked loop by analog carrier in radio frequency down-conversion passage and is realized the local frequency tracking to radio frequency incoming carrier frequency deviation, it is achieved to the catching of radio-frequency carrier having certain frequency deviation; Compare existing digital baseband and follow the tracks of phaselocked loop, present invention employs a kind of analog form by the circuit realiration tracking to radio frequency carrier frequency; Compare existing radio-frequency front-end implementation, a front end band pass filters can be equivalent to by carrier track phaselocked loop tracking characteristics within the scope of certain frequency and filter the band stray of radio-frequency input signals, it is possible to improve radio-frequency front-end spurious reduction and EMC characteristic.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, and in some cases, shown or described step can be performed with the order being different from herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize. so, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (7)
1. a radio frequency down-conversion lane device, it is characterised in that including:
Low-converter, the first input end of described low-converter is connected with radio-frequency carrier input, for producing intermediate-freuqncy signal according to the output of the input of described radio-frequency carrier and described local oscillation circuit;
With reference to crystal oscillator;
Phase discriminator, the first input end of described phase discriminator is connected with the outfan of described low-converter, second input of described phase discriminator is connected with reference to crystal oscillator with described, for producing the DC voltage corresponding with the frequency difference between the frequency of described intermediate-freuqncy signal and the described frequency with reference to crystal oscillator;
Loop filter, the input of described loop filter is connected with the first outfan of described phase discriminator;
Voltage-Controlled oscillation circuit, the input of described Voltage-Controlled oscillation circuit is connected with the outfan of described loop filter, DC voltage for exporting according to described loop filter generates radiofrequency signal, and by the second input of described radio frequency signal feedback to described low-converter.
2. device according to claim 1, it is characterised in that described Voltage-Controlled oscillation circuit is phase noise.
3. device according to claim 1, it is characterised in that described Voltage-Controlled oscillation circuit, including:
VCXO, the input of described VCXO is connected with the outfan of described loop filter;
Phase-locked loop circuit, the input of described phase-locked loop circuit is connected with the outfan of described VCXO, and the outfan of described phase-locked loop circuit is connected with the second input of described low-converter.
4. device according to claim 1, it is characterised in that described Voltage-Controlled oscillation circuit, including:
VCXO, the input of described VCXO is connected with the outfan of described loop filter;
First phase-locked loop circuit, the input of described first phase-locked loop circuit is connected with the outfan of described VCXO, for producing the radiofrequency signal of first frequency;
Second phase-locked loop circuit, the input of described second phase-locked loop circuit is connected with the outfan of described VCXO, for producing the radiofrequency signal of raw second frequency;
Frequency mixer, the first input end of described frequency mixer and the outfan of the first phase-locked loop circuit are connected, second input of described frequency mixer is connected with the outfan of described second phase-locked loop circuit, and the outfan of described frequency mixer is connected with the second input of described low-converter.
5. device according to any one of claim 1 to 4, it is characterised in that also include between described low-converter and described phase discriminator:
First image-reject filter, the input of described first image-reject filter is connected with the outfan of described low-converter;
First amplifier, the input of described first amplifier is connected with the outfan of described first image-reject filter, and the outfan of described first amplifier is connected with the first input end of described phase discriminator.
6. device according to claim 4, it is characterised in that also include between described low-converter and described frequency mixer:
Second image-reject filter, the input of described second image-reject filter is connected with the outfan of described frequency mixer;
Second amplifier, the input of described second amplifier is connected with the outfan of described second image-reject filter, and the outfan of described second amplifier is connected with the first input end of described low-converter.
7. device according to claim 1, it is characterised in that the second outfan of described phase discriminator, is connected with demodulation circuit of intermediate frequency, is used for exporting lock indication signal.
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| CN109088602A (en) * | 2018-08-10 | 2018-12-25 | 成都众景天成科技有限公司 | A kind of millimeter wave broadband low-converter |
| CN114993465A (en) * | 2022-05-31 | 2022-09-02 | 天津大学 | Ultra-weak frequency deviation optical detection system based on photoelectric oscillator |
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| CN114993465A (en) * | 2022-05-31 | 2022-09-02 | 天津大学 | Ultra-weak frequency deviation optical detection system based on photoelectric oscillator |
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