CN203057121U - AGC circuit quick control system based on linear receiver - Google Patents
AGC circuit quick control system based on linear receiver Download PDFInfo
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- CN203057121U CN203057121U CN 201220725489 CN201220725489U CN203057121U CN 203057121 U CN203057121 U CN 203057121U CN 201220725489 CN201220725489 CN 201220725489 CN 201220725489 U CN201220725489 U CN 201220725489U CN 203057121 U CN203057121 U CN 203057121U
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Abstract
The utility model belongs to the technical field of receiver channel AGC control technology and discloses an AGC circuit quick control system based on a linear receiver. The AGC circuit quick control system based on the linear receiver includes a digital signal processor, and a radio frequency antenna; a first attenuation network controlled by the digital signal processor, a radio frequency amplifying circuit, a first intermediate-frequency circuit, a second attenuation network controlled by the digital signal processor, a second intermediate-frequency circuit, a VGA amplifier controlled by the digital signal processor connected successively in series; and a radio frequency field intensity detecting circuit arranged on an output terminal of the radio frequency amplifying circuit, a first intermediate-frequency field intensity detecting circuit arranged on an output terminal of the first intermediate-frequency circuit, a second intermediate-frequency field intensity detecting circuit arranged on an output terminal of the second intermediate-frequency circuit and a total output field intensity detecting circuit arranged on an output terminal of the VGA amplifier. The output terminals of the radio frequency field intensity detecting circuit, the first intermediate-frequency field, the second first intermediate-frequency field and the total output field intensity detecting circuit are connected with corresponding input terminals of the digital signal processor respectively.
Description
Technical field
The utility model technology belongs to receiver channel AGC control technology field, is specifically related to a kind of agc circuit fast acting control system based on linear receiver.
Background technology
The output level of receiver depends on the gain of incoming signal level and receiver.Because a variety of causes, the input range of receiver is often very big, little to-below the 100dBm, big to more than the 10dBm, peak signal and weak signal differ and can reach more than the 100dB, this excursion is called the dynamic range of receiver.
The factor that influences the receiver input signal is a lot, for example, the watt level of transmitter, receiver is from the transmitter distance distance, the variation of signal propagation conditions in communication process is (as ionosphere and tropospheric disturbance, the variation of weather), the variation of receiver environment (as the receiver that is equipped with on the automobile), and the artificial noise that produces is to the influence of receiver etc.In order to overcome extraneous various factors to the influence of receiver input signal, need to use automatic gain control.Automatic gain control (AGC) circuit is communication equipment, one of important circuit of communication control processor particularly, and it mainly acts on is to make the output level of receiver remain on certain numerical value, therefore, also can be described as automatic electric-level control (ALC) circuit.It can guarantee the gain height of receiver when receiving weak signal, and it is low then to gain when receiving strong signal.Keep that receiver is linear to be amplified, the unsaturated distortion of signal makes output signal keep suitable level, and being unlikely to because input signal is too little can't operate as normal, also is unlikely to make receiver take place saturated or obstruction because input signal is too big.
Agc circuit commonly used can be divided into feedback-type agc circuit and feed-forward type agc circuit by the control mode difference.Be usually used in the feedback-type agc circuit in the voltage amplitude control, signal feeds back to VGA then by variable gain amplifier VGA, wave detector, filter, and removes undesirable time dependent variable quantity in the input signal envelope by adjusting the VGA gain.Control loop has been introduced the delay superposition of signal, and has determined the response time of entire circuit.Therefore, feedback-type agc circuit proper velocity is slower.
The feed-forward type agc circuit has the response time fast, because input and gain control walk abreast.Input signal is divided into two-way: the one road to variable gain amplifier VGA, and another road is to wave detector.The design of wave detector need guarantee VGA according to the amplitude of input signal, obtains required control voltage and suitable gain.In two-way, introduce delay compensation, can make the two-way parallel transmission postpone to reach balance.As an open-loop control system, its precision is limited, and only in very among a small circle, output changes with input.
Existing receiver AGC control circuit needs the Multistage Control circuits cascading could satisfy the control range requirement mostly, and is the series connection control mode substantially.When the receiver front end signal increases on a large scale suddenly or reduces, need all control circuits all to move, just can finish whole control process, make output steadily.Because every grade of control circuit all is control loop independently separately, lack mutual and fail to realize centralized control, so the whole AGC control circuit response time be adding up of every grade of control circuit response time, the response time is long.
Summary of the invention
The purpose of this utility model is to provide a kind of agc circuit fast acting control system based on linear receiver, can the complex feed-back type and the advantage of feedback-type agc circuit, changing step by step, control changes concentrated parallel control into, when satisfying the linear amplification requirement of receiver, effectively improve the gain control precision, greatly reduced the AGC response time.
In order to achieve the above object, the utility model is achieved by the following technical solutions.
A kind of agc circuit fast acting control system based on linear receiver, it is characterized in that, comprise digital signal processor, Chuan Lian radio-frequency antenna successively, first attenuation network that is controlled by digital signal processor, radio frequency amplifying circuit, one intermediate-frequency circuit, second attenuation network that is controlled by digital signal processor, two intermediate-frequency circuits, be controlled by the VGA amplifier of digital signal processor, and the radio field intensity testing circuit that is arranged on the radio frequency amplifying circuit output, be arranged on an intermediate frequency field intensity testing circuit of an intermediate-frequency circuit output, be arranged on the two intermediate frequency field intensity testing circuits and total output field intensity testing circuit that the VGA amplifier out is set of two intermediate-frequency circuit outputs; Described radio field intensity testing circuit, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits, the output respective input of linking number word signal processor respectively of always exporting the field intensity testing circuit.
The characteristics of technique scheme and further the improvement are:
Described radio field intensity testing circuit, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits and always export filter, wave detector, amplifier and the comparator that the field intensity testing circuit is successively series connection and form.
Described first attenuation network and second attenuation network are resistive attenuation network.
Described first attenuation network and/or second attenuation network are the optional attenuation network of attenuation segmented.
Described first attenuation network comprises that 0dB attenuator, 6dB attenuator, 12dB attenuator and two are controlled by three of digital signal processor and select an electronic switch.
Described second attenuation network comprises 0dB attenuator, 24dB attenuator and two alternative electronic switches that are controlled by digital signal processor.
In the agc circuit fast acting control system based on linear receiver of the present utility model, comprise the radio field intensity testing circuit that is arranged on the radio frequency amplifying circuit output, be arranged on an intermediate frequency field intensity testing circuit of an intermediate-frequency circuit output, be arranged on the two intermediate frequency field intensity testing circuits and total output field intensity testing circuit that the VGA amplifier out is set of two intermediate-frequency circuit outputs, and be provided with first attenuation network and second attenuation network that is controlled by digital signal processor, digital signal processor detects by the field intensity of diverse location in the acquisition system, the hierarchical segmented incision of finishing first attenuation network and/or second attenuation network then, thus the automatic gain of finishing the VGA amplifier is controlled.Digital signal processor can the complex feed-back type and the advantage of feedback-type agc circuit, changing step by step, control changes concentrated parallel control into, when satisfying the linear amplification requirement of receiver, effectively improved the gain control precision, greatly reduce the AGC response time, make output signal keep suitable level, being unlikely to because input signal is too little can't operate as normal, also is unlikely to make receiver take place saturated or obstruction because input signal is too big.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further details.
Fig. 1 is the principle schematic of the agc circuit fast acting control system based on linear receiver of the present utility model;
Fig. 2 is field intensity testing circuit schematic diagram;
Fig. 3 is the wave detector typical circuit schematic diagram among Fig. 2;
Fig. 4 is the schematic diagram of resistive attenuation network;
Fig. 5 is the schematic diagram of VGA amplifier;
Fig. 6 is the quick control principle figure of agc circuit;
Among the figure: 1, radio frequency amplifying circuit; 2, an intermediate-frequency circuit; 3, two intermediate-frequency circuits.
Embodiment
With reference to Fig. 1, be the principle schematic of the agc circuit fast acting control system based on linear receiver of the present utility model.Should be based on the agc circuit fast acting control system of linear receiver, comprise digital signal processor (DSP), Chuan Lian radio-frequency antenna successively, first attenuation network that is controlled by digital signal processor, radio frequency amplifying circuit 1, one intermediate-frequency circuit 2, second attenuation network that is controlled by digital signal processor, two intermediate-frequency circuits 3, be controlled by the VGA amplifier of digital signal processor, and the radio field intensity testing circuit that is arranged on the radio frequency amplifying circuit output, be arranged on an intermediate frequency field intensity testing circuit of an intermediate-frequency circuit output, be arranged on the two intermediate frequency field intensity testing circuits and total output field intensity testing circuit that the VGA amplifier out is set of two intermediate-frequency circuit outputs.Wherein, radio field intensity testing circuit, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits, the output respective input of linking number word signal processor respectively of always exporting the field intensity testing circuit.
In this system, radio frequency amplifying circuit 1 is amplified and is arranged at two band pass filters that low noise amplifier amplifies input/output terminal and forms by low noise amplifier.One intermediate-frequency circuit 2, two intermediate-frequency circuits 3 all are general intermediate-frequency circuits, need to prove, the utility model adopts the double conversion design at the intermediate-frequency section of receiver.
With reference to Fig. 2, be field intensity testing circuit schematic diagram.The filter that the field intensity testing circuit is connected successively, wave detector, amplifier and comparator are formed, and can provide simulation field intensity detection signal and/or digital field intensity detection signal to digital signal processor (DSP).Above-mentioned field intensity testing circuit all is applicable to radio field intensity testing circuit in the utility model, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits, always exports the field intensity testing circuit.
The effect of its filter is that the rf power signal of getting has been carried out filtering, stops interference signal to enter the wave detector of back, prevents flase drop.
Its wave detector uses the AD8307 chip with quick output response to finish.The AD8307 chip is the logarithmic amplifier that U.S. AD company produces, and can be widely used in the HF communication and instrument and meter system that signal power is needed accurately to measure.It has with dB is the linear response of unit, good temperature stability, precision, linearity height; Have the smooth I/O response from the low frequency to 500MHz, the typical linear slope is 25mV/dB; Input dynamic range reaches 92dB, when being designed to 50 Ω input impedance, the input of its signal can-75dBm～+ 17dBm; The single supply working range is+2.7V～+ 5.5V, typical circuit is as shown in Figure 3.
Its amplifier and comparator use MC33172 and LMC6762 to realize respectively, and purpose is that the wave detector output voltage is fit to the digital level that DSP handles by amplifying, relatively producing, and control requires to set comparator reference voltage according to AGC.
This field intensity testing circuit is used the AD8307 chip as logarithmic detector, by rf power signal P is introduced the AD8307 chip after filtering, press the direct voltage V that 25mV/dB changes through amplification, detection output, the reference voltage V of this direct voltage through amplifying and setting
RRelatively, the digital field intensity detection signal DRSSI that produces 0/3.3V gives digital signal processor (DSP); Or directly direct voltage V is amplified generation simulation field intensity detection signal ARSSI and give digital signal processor (DSP).
With reference to Fig. 4, be the schematic diagram of resistive attenuation network.Be example with second attenuation network, the switching by two alternative electronic switch SW-SMT-1008 makes up the signal path with differential declines amount and realizes that alternative electronic switch SW-SMT-1008, attenuator are Π type or T type resistor network.Wherein, the 0dB attenuator is realized by short-circuit line; The 24dB attenuator is realized by Π type resistor network.
In like manner, first attenuation network can be controlled by three of digital signal processor by two and selects an electronic switch and 0dB attenuator, 6dB attenuator, 12dB attenuator to make up.Attenuator can use separately, but also multi-stage cascade uses, and for example: the 12dB attenuator has two 6dB attenuator cascades to obtain.
With reference to Fig. 5, be the schematic diagram of VGA amplifier.The controllable gain amplifier AD603 chip that the VGA amplifier selects for use U.S. AD company to produce.Chip AD603 is the integrated transporting discharging of a low noise, 90MHz bandwidth adjustable gain.As representing gain with decibel, then gain is linear with control voltage, and slew rate is 275V/ μ s.Connected mode between pin has determined programmable gain ranging, gain-11～+ bandwidth during 30dB is 90MHz, gain+9～+ have the 9MHz bandwidth during 41dB, change the connection resistance between pin, gain is in the above-mentioned scope.This integrated circuit can be applicable to rf agc amplifier, video gain control, A/D conversion Range Extension and Signal Measurement System.
In the present embodiment.Chip AD603 adopts series resistor between pin 5 and the pin 7, obtains gain requirement greater than 40dB with this, and pin 1AGC linking number word signal processor is by the rf gain of the output level control chip AD603 of digital signal processor.
With reference to Fig. 6, be the quick control principle figure of agc circuit, its AGC control algolithm is realized by digital signal processor.
In the present embodiment, the AGC control algolithm with serial and parallel mode, constitutes feed-forward type and feedback-type control loop by different priority is set, the hierarchical segmented automatic gain control of finishing channel.The major control algorithm is as follows:
2IF_1 is the small-signal mark, high expression small-signal, and AGC exports maximum gain.
2IF_2 uprises expression intermediate frequency amplitude and has reached the upper limit of receiving intermediate frequency, so must cut attenuator, reduces the gain of AGC.
The 2IF_3 step-down represents that the intermediate frequency amplitude has reached the lower limit of receiving intermediate frequency, so must disconnect attenuator, the gain that increases AGC.
1IF_1 is the small-signal mark, and high expression small-signal disconnects the 24dB attenuator.
When 2IF_2 uprises, incision 24dB attenuator, during the 1IF_2 step-down, (2IF_2 uprises, and the indication of the amplitude of ARSSI can cut the 24dB attenuator, then cuts the 24dB attenuator to disconnect the 24dB attenuator.The 2IF_3 step-down, and the amplitude of ARSSI indication can disconnect the 24dB attenuator, then disconnects the 24dB attenuator).
RF_1 is the small-signal mark, and high expression small-signal disconnects two 6dB attenuators.
When RF_2 uprises, cut a 6dB attenuator (if after having cut a 6dB attenuator, 2IF_2 uprises, then cut another one 6dB attenuator again, RF_2 is low, simultaneously the 2IF_3 step-down, disconnect an attenuator, if after having disconnected a 6dB attenuator, 2IF_3 is step-down again, then disconnect another one 6dB attenuator again).
Concrete control procedure is as follows:
The field intensity testing circuit has the output of 7 way words: radio field intensity detects (DRSSI_RF_1, DRSSI_RF_2), one intermediate frequency field intensity detects (DRSSI_1IF_1, DRSSI_IF_2), two intermediate frequencies numeral field intensity detects (DRSSI_2IF_1, DRSSI_2IF_2, DRSSI_2IF_3), 1 tunnel simulation output, two intermediate frequency analog detection (ARSSI), feed back to DSP, send control signal AGC_RF2, ATT_CONT, AGC back to after handling via DSP and control 20dBm attenuation network, controllable gain amplifier yield value in radio circuit 12dBm attenuation network, the intermediate frequency amplifier circuit respectively.
Field intensity detection signal initial condition sees Table 1.
Table 1 field intensity detection signal initial condition
Along with the increase of radio-frequency input signals, seven way word field intensity detection signals reach its threshold level respectively, overturn, and are uprised or by high step-down by low.
As DRSSI_2IF_2 during by low uprising, DSP gives intermediate-frequency circuit proper A GC, the gain of control channel according to detected ARSSI.
DRSSI_2IF_2 is high level, and when ARSSI reached 1.3V simultaneously, DSP gave intermediate-frequency circuit ATT_CONT for high, intermediate-frequency circuit incision 20dBm attenuation network, and AGC control is at 0.3V.When DRSSI_1IF_2 is uprised by low, cut the 20dBm attenuation network by force, AGC is 0.2V.
DRSSI_RF_2 is during by low uprising, DSP control radio circuit incision 12dBm attenuation network, and AGC is-0.1V simultaneously.
The variable condition that the numeral field intensity detects is as shown in table 2.
The digital field intensity change detected of table 2 state
In the present embodiment, field intensity testing circuit design has been owing to adopted from the mode of radio frequency, an intermediate frequency, two intermediate frequency block samplings, and fast device is selected in detection, comparison operation device; Simultaneously, sampled point is chosen in before the nonlinear device such as frequency mixer, is conducive to DSP and obtains whole channel magnitude information and channel linearity state information fast, is convenient to the quick response of AGC control and to the control of channel linearity degree.
AGC is controlled to be parallel mode, changes under the little situation at the receiver front end signal, finishes the AGC control procedure by two intermediate frequency controllable gain amplifier AD603.Because AD603 is simulated the continuous control of AGC voltage and changes, its control precision is up to ± 1dB.When front end signal suddenlyd change on a large scale, the linear amplification of receiver had been guaranteed in first attenuation network, second attenuation network, the quick acting simultaneously of VGA amplifier, does not take place saturated or obstruction.Owing to be the parallel control mode, response speed is fast, and the Linear Control of AD603 can well play function served as bridge, remedies the problem that attenuation network is introduced back control precision difference.This design had both improved response speed, had satisfied the requirement of control precision again.
At present, present embodiment has been successfully applied to many moneys ultrashort wave frequency hopping station, and the actual measurement AGC response time is less than 25us, and radio frequency input changes to 0dBm from-120dBm, and the linear demodulation requirement is satisfied in output.
Although below by reference to the accompanying drawings embodiment of the present utility model is described, the utility model is not limited to above-mentioned specific embodiments, and above-mentioned specific embodiments only is schematic, guiding, rather than restrictive.Those of ordinary skill in the art under the situation that does not break away from the scope that the utility model claim protects, can also make a variety of forms under the enlightenment of this specification, these all belong to the row of the utility model protection.
Claims (6)
1. agc circuit fast acting control system based on linear receiver, it is characterized in that, comprise digital signal processor, Chuan Lian radio-frequency antenna successively, first attenuation network that is controlled by digital signal processor, radio frequency amplifying circuit, one intermediate-frequency circuit, second attenuation network that is controlled by digital signal processor, two intermediate-frequency circuits, be controlled by the VGA amplifier of digital signal processor, and the radio field intensity testing circuit that is arranged on the radio frequency amplifying circuit output, be arranged on an intermediate frequency field intensity testing circuit of an intermediate-frequency circuit output, be arranged on the two intermediate frequency field intensity testing circuits and total output field intensity testing circuit that the VGA amplifier out is set of two intermediate-frequency circuit outputs; Described radio field intensity testing circuit, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits, the output respective input of linking number word signal processor respectively of always exporting the field intensity testing circuit.
2. the agc circuit fast acting control system based on linear receiver according to claim 1, it is characterized in that described radio field intensity testing circuit, an intermediate frequency field intensity testing circuit, two intermediate frequency field intensity testing circuits and always export filter, wave detector, amplifier and the comparator that the field intensity testing circuit is successively series connection and form.
3. the agc circuit fast acting control system based on linear receiver according to claim 1 is characterized in that, described first attenuation network and second attenuation network are resistive attenuation network.
4. the agc circuit fast acting control system based on linear receiver according to claim 1 is characterized in that, described first attenuation network and/or second attenuation network are the optional attenuation network of attenuation segmented.
5. the agc circuit fast acting control system based on linear receiver according to claim 1, it is characterized in that described first attenuation network comprises that 0dB attenuator, 6dB attenuator, 12dB attenuator and two are controlled by three of digital signal processor and select an electronic switch.
6. the agc circuit fast acting control system based on linear receiver according to claim 1 is characterized in that, described second attenuation network comprises 0dB attenuator, 24dB attenuator and two alternative electronic switches that are controlled by digital signal processor.
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| CN 201220725489 CN203057121U (en) | 2012-12-25 | 2012-12-25 | AGC circuit quick control system based on linear receiver |
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| CN 201220725489 CN203057121U (en) | 2012-12-25 | 2012-12-25 | AGC circuit quick control system based on linear receiver |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888169A (en) * | 2014-02-21 | 2014-06-25 | 中国人民解放军总参谋部第六十三研究所 | Gain control method for ultra short wave reception channel |
| CN104202002A (en) * | 2014-09-18 | 2014-12-10 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of ultra-short wave radio set |
| CN104868959A (en) * | 2014-02-21 | 2015-08-26 | 中国人民解放军总参谋部第六十三研究所 | Ultrashort wave wideband frequency hopping receiving channel field intensity detection method |
| CN105429716A (en) * | 2015-11-11 | 2016-03-23 | 西安华讯天基通信技术有限公司 | Rapid power detection and automatic gain system and method suitable for multiple channels |
| CN106877892A (en) * | 2017-02-16 | 2017-06-20 | 海能达通信股份有限公司 | A kind of anti-interference reception circuit structure, method and apparatus |
-
2012
- 2012-12-25 CN CN 201220725489 patent/CN203057121U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888169A (en) * | 2014-02-21 | 2014-06-25 | 中国人民解放军总参谋部第六十三研究所 | Gain control method for ultra short wave reception channel |
| CN104868959A (en) * | 2014-02-21 | 2015-08-26 | 中国人民解放军总参谋部第六十三研究所 | Ultrashort wave wideband frequency hopping receiving channel field intensity detection method |
| CN104868959B (en) * | 2014-02-21 | 2018-11-13 | 中国人民解放军总参谋部第六十三研究所 | A kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method |
| CN104202002A (en) * | 2014-09-18 | 2014-12-10 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of ultra-short wave radio set |
| CN105429716A (en) * | 2015-11-11 | 2016-03-23 | 西安华讯天基通信技术有限公司 | Rapid power detection and automatic gain system and method suitable for multiple channels |
| CN105429716B (en) * | 2015-11-11 | 2017-11-14 | 西安华讯天基通信技术有限公司 | A kind of fast power detection and automatic gain system and method suitable for multichannel |
| CN106877892A (en) * | 2017-02-16 | 2017-06-20 | 海能达通信股份有限公司 | A kind of anti-interference reception circuit structure, method and apparatus |
| CN106877892B (en) * | 2017-02-16 | 2019-08-06 | 海能达通信股份有限公司 | A kind of anti-interference reception circuit structure, method and apparatus |
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