CN201821320U - Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station - Google Patents
Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station Download PDFInfo
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- CN201821320U CN201821320U CN2010205487779U CN201020548777U CN201821320U CN 201821320 U CN201821320 U CN 201821320U CN 2010205487779 U CN2010205487779 U CN 2010205487779U CN 201020548777 U CN201020548777 U CN 201020548777U CN 201821320 U CN201821320 U CN 201821320U
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Abstract
The utility model provides a frequency conversion module of an overlay end of a GSM900 digital optical fiber direct amplifier station. The frequency conversion module comprises an up-conversion unit, a down-conversion unit, a controller and a low-noise amplifier, wherein, the low-noise amplifier is connected with the input end of the up-conversion unit through an isolator; the controller comprises a microprocessor, a module temperature detector, a first power detector, a second power detector and an uplink power switch; input ends of the two power detectors are respectively connected with output ends of the low noise amplifier and the down-conversion unit; the microprocessor is further connected with a control end of a first numerical control attenuator of the low noise amplifier and a control end of a second numerical control attenuator of the down-conversion unit; and a local oscillator source of the up-conversion unit and a local oscillator source of the down-conversion unit are both phase-locked loop frequency synthesizers. The frequency conversion module integrates the functions of low noise amplification, high isolation degree and low phase noise, and can effectively reduce the cost of the overlay end of the direct amplifier station.
Description
Technical field
The utility model relates to the optical fiber repeater of moving communicating field, and the particularly capped end frequency-variable module of digital optical fiber direct station in the GSM900 system is applicable to the GSM900 system of high request.
Background technology
The modern society individual is more and more higher to the requirement of mobile communication system, the trend that transmission error rates is low, transmission bandwidth is wideer, two-forty, jumbo communication system have become development.Along with the standardization of base station equipment manufacturer distributed base station equipment, the formulation of common public radio interface, outdoor repeater equipment such as (especially optical fiber repeaters) had great impact, fully investigating on the development trend basis, domestic and international repeater, we have proposed the notion of digital optical fiber direct station.It both can adapt to the needs of main equipment producer distributed base station, and can break away from base station producer fully, flexible configuration, the range of application of expansion product.
The GSM900 digital optical fiber direct station is a class new-type network optimizing equipment, by with Optical Fiber Transmission digitlization and signal processing digitlization, make it have characteristics such as the signal transmission error rates is lower, transmission bandwidth is wideer, transmission range is farther, become the choosing of the certainty of repeater of new generation.As shown in Figure 4, existing GSM900 digital optical fiber direct station capped end comprises digital signal processor 51, frequency converter 52, up low noise amplifier 53, downlink power amplifier 54 and duplexer 55, because of low noise amplifier and frequency converter interfere with each other easily, so existing digital optical fiber direct station capped end was arranged low noise amplifier 53 and frequency converter in 52 minutes, this design makes that the repeater capped end takes up room greatly, cost is high, production efficiency is on the low side.
Secondly, the low noise pipe that traditional small-signal low noise amplifier adopts usually is ATF-55143 and ATE-35143, and the input and output standing wave of these two kinds of low noise pipes is big, difficult coupling, the debugging work load of producing is big, and the parameter error of peripheral cell is vulnerable to influence, and the consistency of debugging is poor.Therefore, press for a kind of new low noise pipe of exempting to debug and substitute ATF-55143, these two kinds of low noise pipes of ATE-35143.
The frequency converter of capped end is used to finish signal to be changed to intermediate frequency to the radio frequency conversion or from radio frequency from intermediate frequency, is the indispensable vitals of digital optical fiber direct station capped end.
Frequency synthesizer is the heart of electronic system, it is the key equipment of decision electronic system performance, along with the development of technology such as communication, Digital Television, satellite fix, Aero-Space, radar and electronic countermeasures, more and more higher requirement has been proposed for stability, frequency purity, the frequency range of frequency synthesizer.Frequency synthesis technique is the certain conversion of standard frequency process with one or more high stables, pinpoint accuracy, produces the technology of a large amount of discrete frequencies of same high stability and accuracy.The frequency synthesis theory is since proposing the thirties in 20th century, and having obtained rapidly, development has formed 3 kinds of present technology commonly used gradually: 1, direct synthesis method of the frequency; 2, Direct Digital synthesis method of the frequency; 3, phase-locked loop frequency synthetic method.
1, direct synthesis method of the frequency
Adopt a M value and all changeable frequency multiplier of N value and frequency divider and corresponding frequency mixer to form.Producing frequency interval is M the discrete frequency of fr/N.
Advantage: the fast frequency conversion, frequency step can be any, low phase noise.
Shortcoming: need a large amount of frequency mixer and filter, bulky, cost an arm and a leg, can not realize that monolithic is integrated, parasitic component is difficult to suppress.
2, Direct Digital synthesis method of the frequency
Under the control of reference clock, frequency control word K comes the sinusoidal ROM table of addressing to carry out the phase amplitude conversion by phase accumulator, exports different amplitude codings; Obtain corresponding staircase waveform through D/A converter again, through low pass filter staircase waveform is carried out smoothly at last, the sine wave of last controlled word decision.
Advantage: the resolution height, the control frequency easy switching changes that frequently speed is fast, and phase noise is little.
Shortcoming: output frequency is low, the clutter noise height, and depend on the development of high speed integrated circuit.
3, phase-locked loop frequency synthetic method
Utilize phase-locked loop, the output frequency of voltage controlled oscillator VCO is locked on the required frequency.
Advantage: circuit is simple, and cost is low, easily control.
Shortcoming: frequency inverted needs the regular hour, and output spectrum has phase noise, and highest frequency is restricted.
In the realization of frequency synthesis, the phase-locked loop frequency synthetic method can obtain phase noise preferably.Cost is lower, and circuit is simple, and reliability is higher, and production efficiency is higher, is suitable as large-scale production more.
Summary of the invention
The purpose of this utility model provides a kind of LNA that is integrated with, and the GSM900 digital optical fiber direct station capped end frequency-variable module of the high and low phase noise of isolation, to reduce repeater capped end cost and to improve its performance.
For reaching above-mentioned purpose, the utility model GSM900 digital optical fiber direct station capped end frequency-variable module, comprise up-conversion unit, down-converter unit and controller, also comprise low noise amplifier, low noise amplifier connects the input of described up-conversion unit by isolator; The up mains switch that described controller comprises microprocessor, is connected to the module Temperature Detector of microprocessor respective input, first power detector and second power detector and is connected to output end of microprocessor, the input of described first power detector and second power detector connects the output of described low noise amplifier and down-converter unit respectively, and microprocessor also connects the control end of second numerical-control attenuator of the control end of first numerical-control attenuator of low noise amplifier and down-converter unit; The local vibration source of described up-conversion unit and the local vibration source of down-converter unit are phase-locked loop frequency synthesizer, and described two local vibration sources connect with the different outputs of described microprocessor respectively.
Further, the local vibration source of described up-conversion unit comprises first frequency synthesizer, first loop filter and first voltage controlled oscillator that connects successively, and the output of first voltage controlled oscillator feeds back to the first frequency synthesizer; The local vibration source of described down-converter unit comprises second frequency synthesizer, second loop filter and second voltage controlled oscillator that connects successively, and the output of second voltage controlled oscillator feeds back to the second frequency synthesizer.
Further, described low noise amplifier comprises first order low noise amplifier, second level low noise amplifier, first filter, first automatic level controller, third level low noise amplifier, first numerical-control attenuator and the fourth stage low noise amplifier that connects successively, and the control end of first automatic level controller connects the output of described first power detector by an ALC control unit.The MGA-631P8 chip of the preferred Avago of described first order low noise amplifier company, the ASL19W chip of the described second level preferred ASB of low noise amplifier company, the ADL5320 of third level low noise amplifier and the preferred ANALOG of fourth stage low noise amplifier company.
Further, described up-conversion unit comprises first mixer tube, second filter and first intermediate frequency amplifier that connects successively, the local vibration source of the LO termination up-conversion unit of first mixer tube.
Further, described down-converter unit comprises second numerical-control attenuator, second automatic level controller, second intermediate frequency amplifier, second mixer tube, the 3rd filter and the radio frequency amplifier that connects successively, and the control end of second automatic level controller connects the output of described second power detector by the 2nd ALC control unit.
Further, the housing of described frequency-variable module is a metal shell, and housing has upper cavity and lower chamber, some shielding parting beads is set in upper cavity and the lower chamber respectively upper cavity and lower chamber is separated into the plurality of sub shielding cavity.
The utility model combines up low noise amplifier and up-downgoing converter unit, effectively reduces the capped end cost.It replaces filter with isolator and realizes that low noise amplifier is connected with the up-conversion unit, and adopts phase-locked loop frequency synthesizer to do the local vibration source of frequency mixer, the isolation height, and phase noise is low.
Its low noise amplifier comprises the level Four amplification, and the first order adopts the MGA-631P8 chip, and the ASL19W chip is adopted in the second level, and gain is high, and noise factor is little, debugs simple.Low noise amplifier is provided with automatic level controller between the second level and the third level, between the third level and the fourth stage numerical-control attenuator is set, and gain control range is big, the control precision height.
It is provided with the module Temperature Detector, the Current Temperatures of detection module in real time, and adjust the numerical control attenuation according to the variation of Current Temperatures, and then adjust gain, make at-25 degree that to the ambient temperatures of+55 degree the gain that can guarantee whole module is in the error range of ± 2dB.
It is provided with up mains switch, can close up radio frequency link automatically when up radio frequency link is unusual.
Its housing adopts the metal shell with upper and lower two cavitys, and upper and lower cavity is separated into the sub-cavity of some shieldings, local vibration source, up radio frequency part, downlink radio frequency part, intermediate-frequency section, power unit, microprocessor portion etc. are separated in the sub-cavity of different shieldings, thereby can be prevented effectively that circuit from forming positive feedback, preventing that digital circuit is subjected to crosstalking mutually of the interference of radiofrequency signal and radiofrequency signal etc. by the space.
Description of drawings
Fig. 1 is the theory diagram of this GSM900 digital optical fiber direct station capped end frequency-variable module;
Fig. 2 is the theory diagram of its low noise amplifier;
Fig. 3 is a kind of preferred embodiment circuit diagram of first power detector;
Fig. 4 is the structural representation of the housing of embodiment frequency-variable module; Wherein, Fig. 4-a and Fig. 4-b are respectively the partial sectional view of housing from front and back, and Fig. 4-d is the front view of housing body part, Fig. 4-c be Fig. 4-d along A-A to cutaway view;
Fig. 5 is the theory diagram of existing frequency-variable module.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
With reference to Fig. 1, this GSM900 digital optical fiber direct station capped end frequency-variable module comprises: up-conversion unit 1, and down-converter unit 2, controller 3, low noise amplifier 4, low noise amplifier 4 connect the input of described up-conversion unit 1 by isolator 5.Intermodulation product and local oscillator that isolator 5 is used to isolate after the mixing are revealed, and reduce the passband fluctuation of whole link.
Up-conversion unit 1 comprises first mixer tube 11, second filter 12 and first intermediate frequency amplifier 13 that connects successively, also comprises the local vibration source 14 of the LO end that is connected first mixer tube 11.Up-conversion unit 1 is used for the up radiofrequency signal after amplifying through low noise is converted to intermediate-freuqncy signal.
The local vibration source 14 of up-conversion unit 1 is a phase-locked loop frequency synthesizer.This local vibration source 14 comprises that the output of the first frequency synthesizer 141, first loop filter 142 and first voltage controlled oscillator, 143, the first voltage controlled oscillators 143 that connect successively feeds back to the RF of first frequency synthesizer 141
INThe A end.This scheme easily property is better, and replaceable voltage controlled oscillator changes the phase noise of local oscillator.
In a kind of better embodiment, first mixer tube 11 adopts the mixer tube SYM-25DHW of Mini-circuits company, and its typical performance index are as follows: bandwidth 80MHz is to 2500MHz, Insertion Loss 6.4dB, the IP3 representative value is 30dBm, and L-R isolation 50dB, L-I isolation are 37dB.That first intermediate frequency amplifier 13 is selected for use is the high-gain tube PW118 of Korea S PREWELL company, and at 90MHZ, its typical performance is: gain 29dB, P1dB is that 20.8dBm and OIP3 are 40dBm.The first frequency synthesizer 141 of local vibration source 14 adopts the ADF4153 of Analog company, its typical performance: fractional frequency division, frequency are up to 4GHz, and 2.7V-3.3V powers, independent power supply of charge pump voltage and electric current are adjustable, and the bottom phase noise is-213dBc/Hz.First loop filter 142 adopts low pass filter, with filtering clutter and high-frequency signal.First voltage controlled oscillator 143 adopts the MVCO0812 or the MVCO1042 of the rich prestige in Hebei, its typical performance: power supply 5V, tuning voltage 0.5V-4.5V, tuning sensitivity 15MHz/V and 16MHz/V, frequency pushing coefficient 1MHz/V (5V ± 0.25V), phase noise-112dBc/Hz@10KHz of MVCO812 ,-132dBc/Hz@100KHz, the phase place of MVCO1042 is made an uproar-85dBc/Hz@1KHz ,-110dBc/Hz@100KHz.
Down-converter unit 2 comprises that the control end of second numerical-control attenuator 21, second automatic level controller 22, second intermediate frequency amplifier 23, second mixer tube 24, the 3rd filter 25 and radio frequency amplifier 26, the second automatic level controllers 22 that connect successively connects the output of second power detector 27 by the 2nd ALC control unit 28.Down-converter unit 2 is used for and will converts radiofrequency signal to after the intermediate-freuqncy signal amplification.The 3rd filter 25 is a radio-frequency filter, and the local oscillator that is used for after the filtering mixing is revealed and intermodulation product.
The local vibration source 29 of down-converter unit 2 comprises that the output of the second frequency synthesizer 291, second loop filter 292 and second voltage controlled oscillator, 293, the second voltage controlled oscillators 293 that connect successively feeds back to the RF of second frequency synthesizer 291
INThe A end.
In a kind of preferred implementation, second numerical-control attenuator 21 adopts PE4306 to realize, second automatic level controller 22 adopts HSMP-3816 to realize, second intermediate frequency amplifier 23 adopts the SBB-2089 of SIRENZA company, radio frequency amplifier 26 adopts two amplifier tube AG602, and the 2nd ALC control unit 28 adopts LM2904 to realize.Wherein, SBB-2089 in the typical performance index of 90MHz is: gain 20dB, P1dB is that 20dBm and OIP3 are 42dBm.Amplifier tube AG602 in the typical performance index of 900MHz is: gain 14dB, P1dB is that 18.5dBm and OIP3 are 33dBm.The second frequency synthesizer 291 of local vibration source 29 and second voltage controlled oscillator 293 are selected the device identical with local vibration source 14 for use.
With reference to Fig. 2, low noise amplifier 4 comprises that the control end of the first order low noise amplifier 41, second level low noise amplifier 42, first filter 43, first automatic level controller 44, third level low noise amplifier 45, first numerical-control attenuator 46 and fourth stage low noise amplifier 47, the first automatic level controllers 44 that connect successively connects the output of described first power detector 35 by an ALC control unit 48.
In a kind of preferred implementation, first order low noise amplifier 41 adopts the MGA-631P8 chip of Avago company, second level low noise amplifier 42 adopts the ASL19W chip of ASB company, and third level low noise amplifier 45 and fourth stage low noise amplifier 47 all adopt the ADL5320 of ANALOG company.Wherein, MGA-631P8 is a kind of low noise small-signal amplifier tube, under the condition of work of 4V/54mA/900MHz, its typical performance is as follows: noise factor 0.53dB, gain 17.5dB, the S11 of-19.4dB and the OIP3 of 32.6dBm, simultaneously can reduce its operating current according to needs.Can debug on its input standing wave theory.ASL19W also is a low noise small-signal amplifier tube, and under the condition of work of 5V/73MA/4.4V, its typical performance is as follows: noise factor 0.9dB, gaining is 20dB, the P1dB of 22dBm and the OIP3 of 35.5dBm.The low noise amplifier of the first and second two-stage high-gains can make the noise factor of whole up link acquisition less than 1.3dB.ADL5320 can obtain the gain of 17.9dB under the operating voltage and 880MHz frequency of 5V, the OIP3 of 47.8dB, and the noise factor of 3.8dB, and its operating current has only 104mA, and power consumption is little.And first automatic level controller 44 adopts the HSMP-3816 of Avago company, can realize the voltage-controlled attenuation range of 30dB, and obtains the IIP3 of 38dBm.First numerical-control attenuator 46 adopts PE4306, by microprocessor 31 controls, can realize the control range of 31dB, and the control precision in gamut is less than 1.5dB.The one ALC control unit 48 realizes that by LM2904 simple in structure, cost is low.
In a kind of preferred implementation, first power detector 35 and second power detector 27 all adopt the AD8314 chip, the output of first power detector 35 and second power detector 27 all is connected rectifier diode, is connected filter capacitor between the negative electrode of rectifier diode and the ground.With Fig. 3 is example, connects rectifier diode D101 at the output of first power detector 35, is connected filter capacitor C152 between the negative electrode of rectifier diode D101 and the ground.Because AD8314 is a peak detection, for the GSM900 time slot signal, the timeslot number difference, detected power difference is in order to satisfy the power detection of different time-gap number, so increased described rectifier diode and filter capacitor at testing circuit.
The power supply power supply of this frequency-variable module is 9V, and the DC-DC converter of 9V-5V is preferentially selected traditional LM7805 for use, has characteristics such as good reliability, ripple is little, spurious signal is little.5V-3.3V the DC-DC converter preferentially select three-terminal voltage-stabilizing pipe LP2985 for use.
In a kind of preferable embodiment, the circuit branch of this frequency-variable module is located on two PCB, in order to prevent that circuit from forming positive feedback by the space, prevent that digital circuit is subjected to crosstalking mutually of the interference of radiofrequency signal and radiofrequency signal etc., therefore, cavity with individual screen is isolated the different circuit on the PCB, specifically adopted following frequency-variable module housing: with reference to Fig. 4-a, 4-b, 4-c and 4-d, the housing 100 of frequency-variable module is a metal shell, housing 100 has upper cavity 101 and lower chamber 102, some shielding parting beads 103 is set in upper cavity 101 and the lower chamber 102 respectively upper cavity 101 and lower chamber 102 is separated into the plurality of sub shielding cavity.Two PCB are loaded on upper cavity 101 and lower chamber 102 respectively, and PCB may to produce the part of interference on layout arranged apart, for example, up radio frequency part, downlink radio frequency part, low noise amplifier section, intermediate-frequency section, up local vibration source, descending local vibration source, power unit, microprocessor portion etc. are arranged separately each several part is corresponding with each the sub-shielding cavity in upper cavity 101 or the lower chamber 102 respectively.
More than by specific embodiment the technical solution of the utility model is further specified; but these explanations can not be interpreted as the restriction to the utility model protection range; those skilled in the art are according to the description of the utility model claim; can also make other execution mode, these all should belong to protection range of the present utility model.
Claims (10)
1. a GSM900 digital optical fiber direct station capped end frequency-variable module comprises up-conversion unit, down-converter unit and controller, it is characterized in that:
Also comprise low noise amplifier, low noise amplifier connects the input of described up-conversion unit by isolator;
The up mains switch that described controller comprises microprocessor, is connected to the module Temperature Detector of microprocessor respective input, first power detector and second power detector and is connected to output end of microprocessor, the input of described first power detector and second power detector connects the output of described low noise amplifier and down-converter unit respectively, and microprocessor also connects the control end of second numerical-control attenuator of the control end of first numerical-control attenuator of low noise amplifier and down-converter unit;
The local vibration source of described up-conversion unit and the local vibration source of down-converter unit are phase-locked loop frequency synthesizer, and described two local vibration sources connect with the different outputs of described microprocessor respectively.
2. frequency-variable module according to claim 1, it is characterized in that: the local vibration source of described up-conversion unit comprises first frequency synthesizer, first loop filter and first voltage controlled oscillator that connects successively, and the output of first voltage controlled oscillator feeds back to the first frequency synthesizer; The local vibration source of described down-converter unit comprises second frequency synthesizer, second loop filter and second voltage controlled oscillator that connects successively, and the output of second voltage controlled oscillator feeds back to the second frequency synthesizer.
3. frequency-variable module according to claim 1, it is characterized in that: described low noise amplifier comprises first order low noise amplifier, second level low noise amplifier, first filter, first automatic level controller, third level low noise amplifier, first numerical-control attenuator and the fourth stage low noise amplifier that connects successively, and the control end of first automatic level controller connects the output of described first power detector by an ALC control unit.
4. frequency-variable module according to claim 3, it is characterized in that: described first order low noise amplifier adopts the MGA-631P8 chip of Avago company, described second level low noise amplifier adopts the ASL19W chip of ASB company, and third level low noise amplifier and fourth stage low noise amplifier all adopt the ADL5320 of ANALOG company.
5. frequency-variable module according to claim 3 is characterized in that: described first automatic level controller adopts the HSMP-3816 of Avago company, and a described ALC control unit adopts the LM2904 chip.
6. frequency-variable module according to claim 1 is characterized in that: described up-conversion unit comprises first mixer tube, second filter and first intermediate frequency amplifier that connects successively, the local vibration source of the LO termination up-conversion unit of first mixer tube.
7. frequency-variable module according to claim 1, it is characterized in that: described down-converter unit comprises second numerical-control attenuator, second automatic level controller, second intermediate frequency amplifier, second mixer tube, the 3rd filter and the radio frequency amplifier that connects successively, and the control end of second automatic level controller connects the output of described second power detector by the 2nd ALC control unit.
8. frequency-variable module according to claim 1, it is characterized in that: described first power detector and second power detector all adopt the AD8314 chip, the output of first power detector and second power detector all is connected rectifier diode, is connected filter capacitor between the negative electrode of rectifier diode and the ground.
9. frequency-variable module according to claim 1, it is characterized in that: the local vibration source of described up-conversion unit comprises first frequency synthesizer, first loop filter and first voltage controlled oscillator that connects successively, and the output of first voltage controlled oscillator feeds back to the first frequency synthesizer; The local vibration source of described down-converter unit comprises second frequency synthesizer, second loop filter and second voltage controlled oscillator that connects successively, and the output of second voltage controlled oscillator feeds back to the second frequency synthesizer; Wherein first frequency synthesizer and second frequency synthesizer all adopt the ADF4153 of Analog company, and first voltage controlled oscillator and second voltage controlled oscillator all adopt the MVCO0812 or the MVCO1042 of the rich prestige in Hebei.
10. frequency-variable module according to claim 1, it is characterized in that: the housing of described frequency-variable module is a metal shell, housing has upper cavity and lower chamber, some shielding parting beads is set in upper cavity and the lower chamber respectively upper cavity and lower chamber is separated into the plurality of sub shielding cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205487779U CN201821320U (en) | 2010-09-29 | 2010-09-29 | Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205487779U CN201821320U (en) | 2010-09-29 | 2010-09-29 | Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station |
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| CN201821320U true CN201821320U (en) | 2011-05-04 |
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| CN2010205487779U Expired - Fee Related CN201821320U (en) | 2010-09-29 | 2010-09-29 | Frequency conversion module of overlay end of GSM900 digital optical fiber direct amplifier station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656576A (en) * | 2015-12-29 | 2016-06-08 | 中国电子科技集团公司第五十四研究所 | C-band power detector |
| CN107707267A (en) * | 2017-10-31 | 2018-02-16 | 上海无线电设备研究所 | A kind of zero intermediate frequency reciver |
-
2010
- 2010-09-29 CN CN2010205487779U patent/CN201821320U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656576A (en) * | 2015-12-29 | 2016-06-08 | 中国电子科技集团公司第五十四研究所 | C-band power detector |
| CN105656576B (en) * | 2015-12-29 | 2018-06-19 | 中国电子科技集团公司第五十四研究所 | A kind of C-band power detector |
| CN107707267A (en) * | 2017-10-31 | 2018-02-16 | 上海无线电设备研究所 | A kind of zero intermediate frequency reciver |
| CN107707267B (en) * | 2017-10-31 | 2020-07-31 | 上海无线电设备研究所 | Zero intermediate frequency receiver |
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