CN203522662U - Mixed-control device for gain of short-wave receiver - Google Patents
Mixed-control device for gain of short-wave receiver Download PDFInfo
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- CN203522662U CN203522662U CN201320643906.6U CN201320643906U CN203522662U CN 203522662 U CN203522662 U CN 203522662U CN 201320643906 U CN201320643906 U CN 201320643906U CN 203522662 U CN203522662 U CN 203522662U
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Abstract
The utility model discloses a mixed-control device for the gain of a short-wave receiver, and the device comprises a front-end protection and preselection filter circuit, a low-noise amplifier, a mixer, an intermediate-frequency amplification circuit, an amplitude detection circuit, a low-pass direction-current amplifier, a controller, and an electrically-controlled attenuation and preselection filter circuit which is equipped with an electrically-controlled attenuator. An intermediate-frequency signal after frequency mixing is transmitted to the intermediate-frequency amplification circuit, and then an intermediate-frequency amplification signal is obtained and divided into two ways: one way is transmitted to the amplitude detection circuit for signal amplitude detection, and then is divided into two ways. One way of the amplitude detection signal is transmitted to the low-pass direction-current amplifier and then an analog gain control signal is outputted, and the other way of the amplitude detection signal is transmitted to the controller and then another analog gain control signal is outputted. The two analog gain control signals are transmitted to the mixer for processing, so as to carry out mixed control of the electrically-controlled attenuator and the intermediate-frequency amplification circuit. The device provided by the utility model can achieve the mixed control of the receiver gain, improves the gain control characteristic, increases the built-up time of gain control, simplifies the structure, and is wider in dynamic range.
Description
Technical field
The utility model relates to a kind of short-wave receiver gain mixed control apparatus, belongs to short-wave receiver gain and mixes control technology field.
Background technology
At present, it is flexible that short wave communication has communication mode, and survivability is strong, the little and simple feature of equipment of transmitting power.Owing to being subject to the impact of the signal conditionings such as ionospheric variation, decline and receiving range, the signal level that short-wave receiver receives there will be strong and weak very greatly different signal power variations, therefore need automatic gain to control (AGC) circuit in short-wave receiver.Agc circuit is a kind of in the situation that input signal amplitude alters a great deal, the automatic control circuit that amplitude output signal is only changed in more among a small circle.AGC plays very important effect in receiver, is directly determining the reception that receiver whether can efficient stable.
Conventional auto gain control method is simulation AGC, it adjusts the gain of front-end amplifier according to the intensity that receives signal by the amplifier of the variable attenuator in receiver or variable gain, thereby amplitude output signal is remained in a less scope, change.Because the time constant of simulation AGC detection is larger, therefore have the slower shortcoming of control rate, receiver need be made reaction timely to the changes in amplitude of input signal simultaneously, and can not extract AGC and control voltage, be subject to the impact of interference signal, therefore simulate the more difficult adaptation of AGC.Still the high requirement of index is controlled in the difficult gain that meets modern short-wave radio receiver.
Therefore design a kind of control smooth, settling time is fast, and the wider gain control of the simple dynamic range of circuit structure just seems particularly important.
Summary of the invention
Technical problem to be solved in the utility model is the defect that overcomes prior art, a kind of short-wave receiver gain mixed control apparatus is provided, it can be realized the mixing of receiver gain and control, improve gain control features, improve it and control settling time, simplify the structure, and dynamic range is wider.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of short-wave receiver gain mixed control apparatus, it comprises front-end protection and preliminary election filter circuit, low noise amplifier, frequency mixer, intermediate frequency amplifier circuit, amplitude detection circuit, low pass and direct current amplifier, controller is adjusted decay and preliminary election filter circuit with the electricity with electrically controlled attenuator, after radio signal is processed by front-end protection and preliminary election filter circuit, being passed to low noise amplifier amplifies after processing, be passed to after electricity is adjusted decay and the mixing of preliminary election filter circuit and obtain intermediate-freuqncy signal, described intermediate-freuqncy signal is passed to intermediate frequency amplifier circuit again and obtains separating two-way after intermediate frequency amplifying signal, one road intermediate frequency amplifying signal is passed to demodulator output, another road intermediate frequency amplifying signal is passed to amplitude detection circuit detection signal strength and obtains separating two-way after amplitude detection signal again, after being passed to low pass and direct current amplifier, one tunnel amplitude detection signal exports analog gain control signal, after being passed to controller, another road amplitude detection signal also exports analog gain control signal, described two-way analog gain control signal is passed to blender again and processes and export that corresponding control signal is passed to respectively electrically controlled attenuator and intermediate frequency amplifier circuit is mixed control.
Further convenient for the gain of this device is controlled, described intermediate frequency amplifier circuit comprises that multistage connected intermediate frequency amplifies subelement, every grade of intermediate frequency amplifies subelement and comprises crystal filter and controllable gain amplifier, and the signal output part of crystal filter is connected with the signal input part of controllable gain amplifier.
Further, described intermediate frequency amplifier circuit comprises that the connected intermediate frequency of two-stage amplifies subelement.
Further, described controller inside has A/D converter, operational amplifier and D/A converter, and another road amplitude detection signal is successively by exporting analog gain control signal after A/D converter, operational amplifier and D/A converter.
Further in order to make controller that the size of numerical control gain can be independently set, via blender, control electrically controlled attenuator and intermediate frequency amplifier circuit, obtain the short-wave receiver gain control value adapting with condition of acceptance, on described controller, be connected with gain size module is set.
Further, described low noise amplifier is comprised of MMIC mmic power amplifier and peripheral circuit thereof.
Further, in order to make low noise amplifier noise lower, described low noise amplifier and electrically controlled attenuator are cascade structure, form controllable gain low noise amplifier.
Further, described electricity adjusts decay and preliminary election filter circuit to be comprised of electrically controlled attenuator, preselection filter and integrated operational amplifier and peripheral circuit thereof.
Adopted after technique scheme, 45MHz intermediate frequency amplifying signal after intermediate frequency amplifier circuit is amplified send after amplitude detection circuit detection signal strength, by low-pass filtering and direct current, amplify it again and obtain analog gain control signal, by blender, control the controllable gain amplifier of electrically controlled attenuator and intermediate frequency amplifier circuit, realize short-wave receiver simulation AGC and control, 45MHz intermediate frequency amplifying signal after intermediate frequency amplifier circuit is amplified send after amplitude detection circuit detection signal strength, A/D converter by controller converts digital quantity to, after operational amplifier, converting analog gain control signal to again by D/A converter exports, via blender, control the controllable gain amplifier of electrically controlled attenuator and intermediate frequency amplifier circuit, realize the digital AGC of short-wave receiver, according to best dynamic range and noise characteristic, complete the distribution that gain is controlled, having realized the mixing of receiver gain controls, improved gain control features, improve it and control settling time, simplify the structure, and dynamic range is wider, it is fast that digital AGC of the present utility model has the settling time of control, control curve is smooth, AGC controls the wider feature of dynamic range, when incoming level changes 80dB, exporting change is less than 3dB: and the gain control range of manual adjustment is not less than 85dB.
Accompanying drawing explanation
Fig. 1 is the theory diagram of short-wave receiver gain mixed control apparatus of the present utility model;
Fig. 2 is the connecting circuit figure that low noise amplifier of the present utility model and electricity are adjusted decay and preliminary election filter circuit;
Fig. 3 is the connecting circuit figure of intermediate frequency amplifier circuit part of the present utility model.
Embodiment
For content of the present utility model is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail below.
As shown in Figure 1, a kind of short-wave receiver gain mixed control apparatus, it comprises front-end protection and preliminary election filter circuit, low noise amplifier, frequency mixer, intermediate frequency amplifier circuit, amplitude detection circuit, low pass and direct current amplifier, controller is adjusted decay and preliminary election filter circuit with the electricity with electrically controlled attenuator, after radio signal (can be within the scope of 1.5MHZ-30MHZ) is processed by front-end protection and preliminary election filter circuit, being passed to low noise amplifier amplifies after processing, be passed to after electricity is adjusted decay and the mixing of preliminary election filter circuit and obtain intermediate-freuqncy signal, described intermediate-freuqncy signal is passed to intermediate frequency amplifier circuit again and obtains separating two-way after intermediate frequency amplifying signal, one road intermediate frequency amplifying signal is passed to demodulator output, another road intermediate frequency amplifying signal is passed to amplitude detection circuit detection signal strength and obtains separating two-way after amplitude detection signal again, after being passed to low pass and direct current amplifier, one tunnel amplitude detection signal exports analog gain control signal, after being passed to controller, another road amplitude detection signal also exports analog gain control signal, described two-way analog gain control signal is passed to blender again and processes and export that corresponding control signal is passed to respectively electrically controlled attenuator and intermediate frequency amplifier circuit is mixed control.
It is convenient for the gain of this device is controlled, intermediate frequency amplifier circuit can comprise that multistage connected intermediate frequency amplifies subelement, every grade of intermediate frequency amplifies subelement and comprises crystal filter and controllable gain amplifier, crystal filter can be 45MHZ crystal filter, and the signal output part of crystal filter is connected with the signal input part of controllable gain amplifier.As shown in Figure 3, intermediate frequency amplifier circuit comprises that the connected intermediate frequency of two-stage amplifies subelement.A4 in Fig. 3 and A5 are controllable gain amplifier, select the AD603 of LiaoADI company, and AD603 is the adjustable controllable gain amplifier of low noise 90MHz bandwidth gain, and the gain representing with decibel is linear with control voltage.For giving full play to the gain control function of AD603, two AD603 adopt concatenated in order form, are conducive to the raising of control precision and signal to noise ratio.This pattern is first enabled the gain of first AD603 when amplifying signal, and then with the gain of second.Ideally the overall gain scope after two concatenated in order is about one 10～60dB, and this leaves abundant surplus for the overall gain of short-wave receiver and gain control range.The insertion, the coupling equal loss that consider the devices such as crystal filter, the overall gain of short-wave receiver front end should be not less than 75dB, and dynamic range should not be less than 80dB, and the utility model has met these requirements well.
Controller inside has A/D converter, operational amplifier and D/A converter, and another road amplitude detection signal is successively by exporting analog gain control signal after A/D converter, operational amplifier and D/A converter.
As shown in Figure 1, in order to make controller that the size of numerical control gain can be independently set, via blender, control electrically controlled attenuator and intermediate frequency amplifier circuit, obtain the short-wave receiver gain control value adapting with condition of acceptance, on described controller, be connected with gain size module is set.
As shown in Figure 2, in order to make low noise amplifier noise lower, low noise amplifier and electrically controlled attenuator are cascade structure, form controllable gain low noise amplifier.Low noise amplifier is comprised of MMIC mmic power amplifier and peripheral circuit thereof.Electricity adjusts decay and preliminary election filter circuit to be comprised of electrically controlled attenuator, preselection filter and integrated operational amplifier and peripheral circuit thereof.A1 in Fig. 2 is low noise amplifier, has selected the MMIC one chip amplifier of Mini-Circuits (or other company), requires the low and 1dB of its noise factor compression high with third order intermodulation index.A2 in Fig. 2 is electrically controlled attenuator, has selected the electrically controlled attenuator of Mittite (or other company), and the A3 in Fig. 2 is integrated operational amplifier, coordinates realize the function that electricity is adjusted analog attenuation with it with electrically controlled attenuator.The gain of MMIC one chip amplifier is 18dB, and the attenuation range of electrically controlled attenuator is 0～-30dB.
Basic principle of the present utility model is to produce the direct current AGC voltage changing with front end incoming level, utilizes this voltage to go to control the gain of some amplifier unit in receiver, and receiver overall gain is changed according to certain rule.Agc circuit is comprised of control circuit and controlled circuit two parts.Control circuit is exactly the generating portion of AGC direct voltage, and the function of controlled circuit is the gain that the control voltage changing that produces according to control circuit changes receiver.Wherein, the decay of electricity tune is controlled circuit with preliminary election filter circuit, controllable gain amplifier: it is control circuit that amplitude detection circuit, low pass and direct current amplifier, controller, gain size arrange module and blender etc.
Above-described specific embodiment; technical problem, technical scheme and beneficial effect that the utility model is solved further describe; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. short-wave receiver gain mixed control apparatus, it is characterized in that: it comprises front-end protection and preliminary election filter circuit, low noise amplifier, frequency mixer, intermediate frequency amplifier circuit, amplitude detection circuit, low pass and direct current amplifier, controller is adjusted decay and preliminary election filter circuit with the electricity with electrically controlled attenuator, after radio signal is processed by front-end protection and preliminary election filter circuit, being passed to low noise amplifier amplifies after processing, be passed to after electricity is adjusted decay and the mixing of preliminary election filter circuit and obtain intermediate-freuqncy signal, described intermediate-freuqncy signal is passed to intermediate frequency amplifier circuit again and obtains separating two-way after intermediate frequency amplifying signal, one road intermediate frequency amplifying signal is passed to demodulator output, another road intermediate frequency amplifying signal is passed to amplitude detection circuit detection signal strength and obtains separating two-way after amplitude detection signal again, after being passed to low pass and direct current amplifier, one tunnel amplitude detection signal exports analog gain control signal, after being passed to controller, another road amplitude detection signal also exports analog gain control signal, described two-way analog gain control signal is passed to blender again and processes and export that corresponding control signal is passed to respectively electrically controlled attenuator and intermediate frequency amplifier circuit is mixed control.
2. short-wave receiver according to claim 1 gain mixed control apparatus, it is characterized in that: described intermediate frequency amplifier circuit comprises that multistage connected intermediate frequency amplifies subelement, every grade of intermediate frequency amplifies subelement and comprises crystal filter and controllable gain amplifier, and the signal output part of crystal filter is connected with the signal input part of controllable gain amplifier.
3. short-wave receiver gain mixed control apparatus according to claim 2, is characterized in that: described intermediate frequency amplifier circuit comprises that the connected intermediate frequency of two-stage amplifies subelement.
4. short-wave receiver according to claim 1 gain mixed control apparatus, it is characterized in that: described controller inside has A/D converter, operational amplifier and D/A converter, another road amplitude detection signal is successively by exporting analog gain control signal after A/D converter, operational amplifier and D/A converter.
5. according to the short-wave receiver gain mixed control apparatus described in claim 1 or 4, it is characterized in that: on described controller, be connected with gain size module is set.
6. short-wave receiver gain mixed control apparatus according to claim 1, is characterized in that: described low noise amplifier is comprised of MMIC mmic power amplifier and peripheral circuit thereof.
7. according to the short-wave receiver gain mixed control apparatus described in claim 1 or 6, it is characterized in that: described low noise amplifier and electrically controlled attenuator are cascade structure.
8. short-wave receiver gain mixed control apparatus according to claim 1, is characterized in that: described electricity adjusts decay and preliminary election filter circuit to be comprised of electrically controlled attenuator, preselection filter and integrated operational amplifier and peripheral circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320643906.6U CN203522662U (en) | 2013-10-18 | 2013-10-18 | Mixed-control device for gain of short-wave receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320643906.6U CN203522662U (en) | 2013-10-18 | 2013-10-18 | Mixed-control device for gain of short-wave receiver |
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| CN203522662U true CN203522662U (en) | 2014-04-02 |
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| CN201320643906.6U Expired - Lifetime CN203522662U (en) | 2013-10-18 | 2013-10-18 | Mixed-control device for gain of short-wave receiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| CN104244146A (en) * | 2014-09-17 | 2014-12-24 | 深圳市好兄弟电子有限公司 | Gain control method for wireless microphone receiver |
| CN109672412A (en) * | 2018-12-13 | 2019-04-23 | 贵州航天电子科技有限公司 | Low-frequency amplifier dynamic range circuit in a kind of control |
| CN111510173A (en) * | 2020-04-24 | 2020-08-07 | 中国人民解放军火箭军工程大学 | Multichannel radio station received signal separation method and device and analog radio station host |
-
2013
- 2013-10-18 CN CN201320643906.6U patent/CN203522662U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| CN104244146A (en) * | 2014-09-17 | 2014-12-24 | 深圳市好兄弟电子有限公司 | Gain control method for wireless microphone receiver |
| CN104244146B (en) * | 2014-09-17 | 2018-03-06 | 深圳市好兄弟电子有限公司 | A kind of wireless microphone receiver gain control method |
| CN109672412A (en) * | 2018-12-13 | 2019-04-23 | 贵州航天电子科技有限公司 | Low-frequency amplifier dynamic range circuit in a kind of control |
| CN111510173A (en) * | 2020-04-24 | 2020-08-07 | 中国人民解放军火箭军工程大学 | Multichannel radio station received signal separation method and device and analog radio station host |
| CN111510173B (en) * | 2020-04-24 | 2021-09-28 | 中国人民解放军火箭军工程大学 | Multichannel radio station received signal separation method and device and analog radio station host |
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Granted publication date: 20140402 |