CN103647509B - One realizes signal automatic level control circuit and control method - Google Patents
One realizes signal automatic level control circuit and control method Download PDFInfo
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- CN103647509B CN103647509B CN201310700871.XA CN201310700871A CN103647509B CN 103647509 B CN103647509 B CN 103647509B CN 201310700871 A CN201310700871 A CN 201310700871A CN 103647509 B CN103647509 B CN 103647509B
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Abstract
The invention provides one and realize signal automatic level control circuit and control method, wherein circuit comprises main path signal coupling circuit, detecting circuit, logarithmic amplification circuit, signal envelope parser circuitry, sampling sample circuit and operation processing unit and V/I converter unit; In main path signal coupling circuit, be coupled out in proportion a road coupled signal, after sample circuit sampling quantification is resolved, sampled to detecting circuit detection, the amplification of logarithmic amplification circuit, signal envelope parser circuitry, sending into operation processing unit processes, obtain E, outputing to V/I converter unit changes, obtain X, be sent to the line pad in main path signal coupling circuit main road. Adopt such scheme, ALC system bandwidth, particularly AM modulation bandwidth are limited to again the speed of processor not too much. Application shows, can design high performance automatic electric-level control system by the method, in RF/Microwave signal source, has a good application prospect.
Description
Technical field
The present invention relates to signal source field, particularly relate to one and realize signal automatic level control circuitAnd control method.
Background technology
Automatic electric-level control (AutomaticLevelControl, hereinafter to be referred as ALC) is certainly a kind ofMoving, the accurate common method of control signal amplitude, be widely used in communication transmitter, signal source andVarious measuring instruments. Especially in the composition of signal source, ALC becomes a vital part especially,Direct relation power flatness, power stability, power accuracy and power output dynamic rangeEtc. index. Can say so, the quality of ALC performance will directly affect the power spy of signal source output signalProperty.
In signal source, the high-performance automatic electric-level control system of extensive use is based on analog device at presentFeed forward type ALC system. First level reference signal is added on line pad, meanwhile, and deferred telegramThe rectified signal that road makes reference level signal and signal source export coupled signal synchronously arrives comparator and asksWith, its small difference is the power of further corrected signal source output signal again. Its structure as shown in Figure 1,The advantage of this ALC system is to solve the problem of ALC system AM modulation depth and bandwidth deficiency in the past.But this system used a large amount of operational amplifiers, analog switch, triode and Resistor-Capacitor Unit withThe function of guarantee system, this causes complex circuit designs, and parameter testing is numerous and diverse, also takies a large amount of simultaneouslyPrinted board area resource, causes instrument miniaturization difficulty.
Have in addition the ALC system based on Design of digital, its core is microprocessor. Signal sourceOutput signal obtains coupled signal by coupler, and coupled signal is delivered to place after the detection of wave detectorReason device. Processor, according to the detecting circuit of input, obtains digital controlled signal and removes the number on control accessControlling attenuation device, realizes the object of ALC. As shown in Figure 2, the advantage of this system is structure letter to its structureSingle, flexible design, can do various compensation, but it exists an important shortcoming, i.e. ALC systemThe Bandwidth-Constrained of system is in the speed of processor. Particularly, in the time that AM modulates, AM modulation bandwidth will receive greatlyBe limited to the speed of processor.
Therefore, there is defect in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, and a kind of letter of realizing is providedNumber automatic level control circuit and control method.
Technical scheme of the present invention is as follows:
One realizes signal automatic level control circuit, wherein, comprises main path signal coupling circuit, inspectionWave circuit, logarithmic amplification circuit, signal envelope parser circuitry, sampling sample circuit and calculation process listUnit and V/I converter unit; In main path signal coupling circuit, be coupled out in proportion a road coupled signal,Resolve, sample quantification through detecting circuit detection, the amplification of logarithmic amplification circuit, signal envelope parser circuitryAfter circuit sampling quantizes, send into operation processing unit and process, obtain E, output to V/I converter unitChange, obtain X, be sent to the line pad in main path signal coupling circuit main road, thus controlMain path signal power level processed.
Described control circuit, wherein, described main path signal coupling circuit comprise front amplifying circuit and afterAmplifying circuit, line pad and coupling circuit; Described front amplifying circuit and rear amplifying circuit are for realExisting signal amplifies; Described line pad is used for realizing signal linear attenuation; Described coupling circuit is used forRealize signal coupling.
Described control circuit, wherein, described signal envelope parser circuitry, for analytic signal envelopeMaximum, minimum of a value and mean value.
Described control circuit, wherein, operation processing unit comprises numerical value conditioning module, amplitude adjustment controlModule, power reference module, digital integration module and exponential transform module, described numerical value conditioning module,According to the frequency of main path signal and power, sampling amount data are carried out to linear process; Described amplitude adjustment controlModule, for according to the maximum of signal envelope, minimum of a value and mean value, to main path signal power andAM modulation depth is controlled automatically; Described power reference generation module, for generation of value and power referenceWith AM modulation parameter; Described digital integration module, for automatically adjusting the power level of main path signal,It is stabilized in default performance number; Described exponential transform module, for by linear power reference numberValue transform is on the performance number taking dB as unit.
Described control circuit, wherein, described V/I converter unit, for magnitude of voltage is transformed intoProportional current value, to adapt to the input characteristics of line pad.
A control method for control circuit, wherein, comprises the following steps:
Step 1: be coupled out in proportion a road coupled signal from main path signal, after detection and logarithmic amplificationSend into signal envelope resolution unit, parse maximum, minimum of a value and the average of coupled signal envelope;
Step 2: after maximum, minimum of a value and the average to coupled signal envelope samples and quantizes,To A, be sent to operation processing unit;
Step 3: power reference module produces the data that determine the final power of main path signal; Meanwhile, numerical valueConditioning module is according to the frequency of main path signal and power, to A superpose constant biasing and take advantage of multiple because ofSon is processed;
Step 4: the data after the data of final power and numerical value conditioning are asked to difference operation, draw twoPerson's error B, integration module obtains C to this difference integration;
Step 5: C and power reference numerical value are carried out to summation operation, obtain D, exponential transform module againD is carried out to exponential transform, obtain E;
Step 6:V/I converter unit is exported corresponding electric current according to input E and is driven linear attenuation unitsRealize main path signal level is controlled automatically.
Adopt such scheme, have simple in structure, integrated level is high, be easy to debugging feature. Meanwhile,ALC system bandwidth, particularly AM modulation bandwidth are limited to again the speed of processor not too much. Application tableBright, can design high performance automatic electric-level control system by the method, at RF/Microwave signalIn source, have a good application prospect.
Brief description of the drawings
Fig. 1 is a kind of alc circuit structural representation in prior art;
Fig. 2 is the another kind of alc circuit structural representation of prior art;
Fig. 3 is alc circuit structural representation of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 3, one realizes signal automatic level control circuit, wherein, comprises main path signalCoupling circuit, detecting circuit, logarithmic amplification circuit, signal envelope parser circuitry, sampling sample circuitAnd operation processing unit and V/I converter unit; In main path signal coupling circuit, be coupled out in proportion oneRoad coupled signal, through detecting circuit detection, the amplification of logarithmic amplification circuit, signal envelope parser circuitry solutionAnalyse, sample and after sample circuit sampling quantizes, send into operation processing unit and process, obtain E, output toV/I converter unit changes, and obtains X, and the linearity being sent in main path signal coupling circuit main road declinesSubtract device, thereby control main path signal power level.
Described control circuit, wherein, described main path signal coupling circuit comprise front amplifying circuit and afterAmplifying circuit, line pad and coupling circuit; Described front amplifying circuit and rear amplifying circuit are for realExisting signal amplifies; Described line pad is used for realizing signal linear attenuation; Described coupling circuit is used forRealize signal coupling.
Described control circuit, wherein, described signal envelope parser circuitry, for analytic signal envelopeMaximum, minimum of a value and mean value.
Described control circuit, wherein, operation processing unit comprises numerical value conditioning module, amplitude adjustment controlModule, power reference module, digital integration module and exponential transform module, described numerical value conditioning module,According to the frequency of main path signal and power, sampling amount data are carried out to linear process; Described amplitude adjustment controlModule, for according to the maximum of signal envelope, minimum of a value and mean value, to main path signal power andAM modulation depth is controlled automatically; Described power reference generation module, for generation of value and power referenceWith AM modulation parameter; Described digital integration module, for automatically adjusting the power level of main path signal,It is stabilized in default performance number; Described exponential transform module, for by linear power reference numberValue transform is on the performance number taking dB as unit.
Described control circuit, wherein, described V/I converter unit, for magnitude of voltage is transformed intoProportional current value, to adapt to the input characteristics of line pad.
On the basis of foregoing, the present invention also provides a kind of control method of control circuit, comprise withLower step:
Step 1: be coupled out in proportion a road coupled signal from main path signal, after detection and logarithmic amplificationSend into signal envelope resolution unit, parse maximum, minimum of a value and the average of coupled signal envelope;
Step 2: after maximum, minimum of a value and the average to coupled signal envelope samples and quantizes,To A, be sent to operation processing unit;
Step 3: power reference module produces the data that determine the final power of main path signal; Meanwhile, numerical valueConditioning module is according to the frequency of main path signal and power, to A superpose constant partially and take advantage of multiple because ofSon is processed;
Step 4: the data after the data of final power and numerical value conditioning are asked to difference operation, draw twoPerson's error B, integration module obtains C to this difference integration;
Step 5: C and power reference numerical value are carried out to summation operation, obtain D, exponential transform module againD is carried out to exponential transform, obtain E;
Step 6:V/I converter unit is exported corresponding electric current according to input E and is driven linear attenuation unitsRealize main path signal level is controlled automatically.
Adopt such scheme, have simple in structure, integrated level is high, be easy to debugging feature. Meanwhile,ALC system bandwidth, particularly AM modulation bandwidth are limited to again the speed of processor not too much. Application tableBright, can design high performance automatic electric-level control system by the method, at RF/Microwave signalIn source, have a good application prospect.
Should be understood that, for those of ordinary skills, can be according to the above description in additionImprove or conversion, and all these improvement and conversion all should belong to the protection of claims of the present inventionScope.
Claims (5)
1. realize a signal automatic level control circuit, it is characterized in that, comprise main path signal coupling circuit,Detecting circuit, logarithmic amplification circuit, signal envelope parser circuitry, sampling sample circuit and computing placeReason unit and V/I converter unit; In main path signal coupling circuit, be coupled out in proportion a road couplingSignal, through detecting circuit detection, logarithmic amplification circuit amplify, signal envelope parser circuitry is resolved,After the sampling of sampling sample circuit quantizes, send into operation processing unit and process, obtain E, output toV/I converter unit changes, and obtains X, is sent to the line in main path signal coupling circuit main roadProperty attenuator, thereby control main path signal power level; Operation processing unit comprises numerical value conditioning mouldPiece, amplitude adjustment control module, power reference module, digital integration module and exponential transform module, instituteState numerical value conditioning module, according to the frequency of main path signal and power, sampling amount data are carried out to linearityProcess; Described amplitude adjustment control module, for according to the maximum of signal envelope, minimum of a value and averageValue, controls automatically to main path signal power and AM modulation depth; Described power reference occursModule, for generation of value and power reference and AM modulation parameter; Described digital integration module, forAutomatically adjust the power level of main path signal, it is stabilized in default performance number; Described index becomesDie change piece, for by linear power reference numerical transformation to the performance number taking dB as unit.
2. control circuit as claimed in claim 1, is characterized in that, described main path signal coupling circuit bagDraw together front amplifying circuit and rear amplifying circuit, line pad and coupling circuit; Described front amplifying circuitAnd rear amplifying circuit is used for realizing signal amplification; Described line pad is used for realizing signal linearity and declinesSubtract; Described coupling circuit is used for realizing signal coupling.
3. control circuit as claimed in claim 1, is characterized in that, described signal envelope parser circuitry,For maximum, minimum of a value and the mean value of analytic signal envelope.
4. control circuit as claimed in claim 1, is characterized in that, described V/I converter unit, forMagnitude of voltage is transformed into proportional current value with it, to adapt to the input characteristics of line pad.
5. the control circuit described in right to use requirement 1 is realized a method for signal automatic electric-level control, itsBe characterised in that, comprise the following steps:
Step 1: be coupled out in proportion a road coupled signal from main path signal, after detection and logarithmic amplificationSend into signal envelope resolution unit, parse maximum, the minimum of coupled signal envelopeValue and average;
Step 2: after maximum, minimum of a value and the average to coupled signal envelope samples and quantizes,To A, be sent to operation processing unit;
Step 3: power reference module produces the data that determine the final power of main path signal; Meanwhile, numerical valueConditioning module is according to the frequency of main path signal and power, to the A constant biasing that superposesWith take advantage of multiplying factor processing;
Step 4: the data after the data of final power and numerical value conditioning are asked to difference operation, draw twoPerson's error B, integration module obtains C to this difference integration;
Step 5: C and power reference numerical value are carried out to summation operation, obtain D, exponential transform module againD is carried out to exponential transform, obtain E;
Step 6:V/I converter unit is exported corresponding electric current according to input E and is driven linear attenuation unitsRealize main path signal level is controlled automatically.
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| CN105404349A (en) * | 2015-11-11 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | Digital automatic level control circuit having constant temperature detection function and digital automatic level control method |
| CN107707208B (en) * | 2017-10-25 | 2021-09-24 | 京信网络系统股份有限公司 | Signal power control method and control circuit for communication system equipment |
| CN109462413A (en) * | 2018-12-25 | 2019-03-12 | 成都前锋电子仪器有限责任公司 | For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source |
| CN110808747A (en) * | 2019-11-26 | 2020-02-18 | 中兵通信科技股份有限公司 | Power output and modulation degree detection circuit of airborne transmitter |
| CN112162260A (en) * | 2020-09-27 | 2021-01-01 | 广东博智林机器人有限公司 | Laser radar narrow pulse signal's peak amplitude detecting system |
| CN116155352B (en) * | 2023-01-14 | 2024-05-31 | 西安空间无线电技术研究所 | Satellite-borne power agility control circuit system and control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013361A (en) * | 1983-07-01 | 1985-01-23 | Mitsubishi Electric Corp | Recording system of digital audio signal |
| JPH05129861A (en) * | 1991-11-05 | 1993-05-25 | Fujitsu Ltd | Automatic power control system for burst signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000349738A (en) * | 1999-06-07 | 2000-12-15 | Nec Saitama Ltd | Automatic level controller for multiplex modulation wave |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013361A (en) * | 1983-07-01 | 1985-01-23 | Mitsubishi Electric Corp | Recording system of digital audio signal |
| JPH05129861A (en) * | 1991-11-05 | 1993-05-25 | Fujitsu Ltd | Automatic power control system for burst signal |
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Effective date of registration: 20190226 Address after: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 266555 No. 98 Xiangjiang Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: The 41st Institute of CETC |
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Address after: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: CLP kesiyi Technology Co.,Ltd. Address before: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd. |
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