CN203399067U - Cascade-type AGC system - Google Patents
Cascade-type AGC system Download PDFInfo
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- CN203399067U CN203399067U CN201320454839.3U CN201320454839U CN203399067U CN 203399067 U CN203399067 U CN 203399067U CN 201320454839 U CN201320454839 U CN 201320454839U CN 203399067 U CN203399067 U CN 203399067U
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Abstract
The utility model provides a cascade-type AGC system, comprising n VGA modules which are connected in order, a AD signal acquisition unit in connection with the VGA modules, a gain control module in connection with AD acquisition modules, a multi-channel DA signal output module which is connected with the gain control module and the VGA modules, and a switch unit which is arranged between every two adjacent VGA modules and is connected with the gain control module. According to the utility model, when an input signal is within a certain range, the output of the cascade-type AGC system is a fixed value and is sent to the gain control module via the AD acquisition modules, so that the amplitude of the input signal can be detected. A DA signal is outputted to gain control pins of the VGA modules, so as to control the gain automatically and precisely. The cascade-type AGC system is formed by automatically switching on switch modules, thereby increasing the gain range.
Description
Technical field
The utility model relates to signal controlling field, particularly a kind of cascade connection type AGC system for automatic control signal gain.
Background technology
Along with the fast development of electron trade, signal has greatly, has little, there is high frequency, low frequency signal, so changeable signal, and AGC solution is a kind of, can not change along with the variation of input signal, can obtain rapidly a signal that can not change, i.e. a certain fixed value.Existing optical cable generaI investigation device, optical time domain reflecting device etc. all need light signal to be converted into the signal of telecommunication, and these signals are all transformable.
At present, along with the development of electronic industry, the processing of small-signal is more and more, and high frequency small-signal constantly changes amplitude in circuit simultaneously, makes intractability become large, is difficult to find a kind of system of good automatic control.
In prior art, can only process the signal of low frequency, and the distance that light transmits in optical fiber is far away, the light signal of returning is just fainter, after photoelectric conversion, the signal of telecommunication of input is also just fainter, and gain just cannot reach a certain fixed value of output not, and the while is the size of ride gain accurately also.Therefore technology also has a lot of areas for improvement at present.
Summary of the invention
In order to address the above problem, a kind of cascade connection type AGC system that the utility model provides, it comprises:
N level VGA module, comprises the first order VGA module, the second level VGA module that connect successively ... N level VGA module, and wherein N is not less than 1 integer;
With the AD signal gathering unit that described VGA modules at different levels are connected, the output of described VGA module is connected with the input of described AD collecting unit;
With the gain control module that described AD signal gathering unit is connected, described gain control module is connected with the output of described AD signal acquisition module by input;
The multichannel DA signal output module being connected with described gain control module, described gain control module is connected with the input of described multichannel DA signal output module by the first output, and described DA output module output is connected with the gain control end of described each VGA module;
Be located at the switch element between each adjacent two-stage VGA module, the input of described switch element is connected with the output of higher VGA module in described any two-stage VGA module, the output of described switch element is connected with the input of more rudimentary VGA module, and described switch element is connected with the second output of described gain control module by its control end.
Preferably, described AD signal gathering unit comprises a multichannel AD signal acquisition module, and described multichannel AD signal acquisition module comprises N input, and the input of described AD signal acquisition module is corresponding one by one with described VGA modules at different levels.
Preferably, described AD signal gathering unit comprises N the AD signal acquisition module connecting one to one with described VGA modules at different levels, described each AD signal acquisition module input is connected with the output of described VGA modules at different levels respectively, and described each AD signal acquisition module respectively output by is separately connected with described gain control module.
Preferably, described switch element comprises a variable connector selection module, described variable connector selects module to comprise N-1 input, a N-1 output and a control end, described each input is connected with the output of higher VGA module in described each arbitrary neighborhood two-stage VGA module respectively, described each output is connected with the input of VGA module more rudimentary in described each arbitrary neighborhood two-stage VGA module respectively, and described control end is connected with the second output of described gain control module.
Preferably, described gain control module comprises 1 the first output, 1 the second output and N input.
Preferably, described switch element comprises N-1 switch module, described each switch module is located at respectively between arbitrary neighborhood two-stage VGA module, described each switch module is connected with the output of higher VGA module in described each arbitrary neighborhood two-stage VGA module by its input, described each switch module is connected with the input of VGA module more rudimentary in described each arbitrary neighborhood two-stage VGA module by its output, and described each switch module is connected with the second output of described gain control module by its control end respectively.
Preferably, described gain control module comprises 1 the first output, N-1 the second output and N input.
Preferably, described DA signal output module comprises an input port and N output port.
Preferably, it comprises a plurality of DA signal output module, and the output of described each DA signal output module adds up to N, and described each DA signal output module is connected with described gain control module respectively.
Preferably, also comprise a photoelectric conversion module, described photoelectric conversion module output is connected with a described VGA module.
The utlity model has following beneficial effect:
Automatic gain is controlled, in a certain scope of input signal, output signal can not change along with the variation of input signal, make AGC system be output as a certain fixed value, through AD sampling module, be sent to gain control module, the large small magnitude of input signal can be detected, DA outputs to the gain control tubulation pin of VGA, can be automatically, the size of ride gain accurately, by automatically opening switch module, form cascade connection type AGC system, increase gain ranging.
Accompanying drawing explanation
Embodiment bis-structural representations that Fig. 1 provides for the utility model;
Embodiment mono-structural representation that Fig. 2 provides for the utility model;
Embodiment tri-structural representations that Fig. 3 provides for the utility model.
Embodiment
The utility model provides a kind of cascade connection type AGC system, and it comprises:
N level VGA module, comprises the first order VGA module, the second level VGA module that connect successively ... N level VGA module, and wherein N is not less than 1 integer;
With the AD signal gathering unit that described VGA modules at different levels are connected, the output of described VGA module is connected with the input of described AD collecting unit;
With the gain control module that described AD signal gathering unit is connected, described gain control module is connected with the output of described AD signal acquisition module by input;
The multichannel DA signal output module being connected with described gain control module, described gain control module is connected with the input of described multichannel DA signal output module by the first output, and described DA output module output is connected with the gain control end of described each VGA module;
Be located at the switch element between each adjacent two-stage VGA module, the input of described switch element is connected with the output of higher VGA module in described any two-stage VGA module, the output of described switch element is connected with the input of more rudimentary VGA module, and described switch element is connected with the second output of described gain control module by its control end.
Embodiment mono-
As shown in Figure 2, it is a kind of cascade connection type AGC system that the present embodiment provides, and comprises photoelectric conversion module, single VGA module, high-speed AD adopts module, multichannel DA signal output module, gain control module accurately, switch module (as relay, optocoupler mos pipe etc.).
The first order is amplified: the output pin S1 of photoelectric conversion module connects the input pin S2 of VGA module, carry out signal amplification, the output pin S3 of VGA module connects AD signal acquisition module input pin S13, carry out AD collection of simulant signal, then the output pin S14 of AD signal acquisition module connects the input pin S15 of gain control module.
Gain control module now starts judgement: if now, the value that signals collecting arrives, is needed a certain fixed value, keeps this yield value.
If now, the value that signals collecting arrives, surpasses a certain fixed value, needs to reduce yield value, the input pin S11 of the output pin S12 connecting multi-channel DA signal output module by gain control module, control the magnitude of voltage of its output pin S10, then, the S10 of DA signal output module connects the input pin S9 of VGA module, control and reduce its yield value, then AD signal acquisition module is at collection signal, and so circulation, until export a certain fixed value.
If now, the value that signals collecting arrives, do not reach a certain fixed value, the S12 connecting multi-channel DA signal output module input pin S11 of gain control module, controls the magnitude of voltage of multichannel DA output to VGA module, control the yield value that increases VGA, then if AD signal acquisition module collection signal again, increases yield value through circulation repeatedly, gradually the value that signals collecting arrives, be needed a certain fixed value, keep this yield value.
Embodiment bis-
As shown in Figure 1, it is a kind of cascade connection type AGC system that the present embodiment provides, and comprises photoelectric conversion module, N level VGA module, high speed N AD adopts module, multichannel DA signal output module, gain control module accurately, N-1 switch module (as relay, optocoupler mos pipe etc.).
The first order is amplified: the output pin S1 of photoelectric conversion module connects the input pin S2 of first order VGA module, carry out signal amplification, the output pin S3 of first order VGA module connects first order AD signal acquisition module input pin S13, carry out AD collection of simulant signal, then the output pin S14 of first order AD signal acquisition module connects the input pin S15 of gain control module.
Gain control module now starts judgement: if now, the value that signals collecting arrives, is needed a certain fixed value, keeps this yield value.
If now, the value that signals collecting arrives, do not reach a certain fixed value, the S12 connecting multi-channel DA signal output module input pin S11 of gain control module, controls the magnitude of voltage of multichannel DA output to first order VGA module, control the yield value that increases first order VGA, then if AD signal acquisition module collection signal again, increases yield value through circulation repeatedly, gradually the value that signals collecting arrives, be needed a certain fixed value, keep this yield value.
If it is maximum that the yield value of first order VGA module has reached, also do not reach a certain fixed value of output, open switch module, carry out second level VGA module and amplify.
Amplify the second level: if signal amplifies through first order VGA module, cannot meet a certain fixed value of output, just open first order switch module.The output pin S17 of gain control module connects the input pin S16 of first order switch module, gain control module control switch module is opened switch, the output pin S3 of first order VGA module connects first order switch module input pin S4, the output pin S5 of first order switch module connects the input pin S6 of the VGA module of the second level, carry out signal amplification, second level VGA output pin S7 connects the input pin S19 of second level AD signal acquisition module, carry out AD signals collecting, the output pin S20 of second level AD signal acquisition module connects gain control module input pin S21, gain control module is carried out the judgement of signals collecting, whether reach a certain fixed value.
The S12 connecting multi-channel DA signal output module input pin S11 of gain control module, controls the magnitude of voltage of multichannel DA output to second level VGA module, controls the yield value that increases second level VGA module.So circulation is gone down.If now, the value that signals collecting arrives, is needed a certain fixed value, keeps this yield value.
If do not reach a certain fixed value, just carry out the VGA module of the third level and amplify.Concrete steps are identical with the step that the VGA module of the second level is amplified.
Embodiment tri-
As shown in Figure 3, the present embodiment provides a kind of cascade connection type AGC system, and it comprises:
N level VGA module, comprises the first order VGA module, the second level VGA module that connect successively ... N level VGA module, and wherein N is not less than 1 integer;
One multichannel AD signal acquisition module 3, multichannel AD signal acquisition module 3 comprises N input, comprise first input end, the second input .... N input, each input of multichannel AD signal acquisition module 3 is corresponding one by one with described VGA modules at different levels respectively;
With the gain control module 1 that multichannel AD signal acquisition module 3 is connected, gain control module 1 is connected with the output of multichannel AD signal acquisition module 3 by input;
Multichannel AD signal acquisition module 3 is connected with gain control module 1 by an output;
The multichannel DA signal output module 2 being connected with gain control module 1, gain control module 1 is connected with the input of multichannel DA signal output module 2 by the first output, and DA output module output 2 is connected with the gain control end of described each VGA module;
One variable connector is selected module 4, variable connector selects module 4 to comprise N-1 input, a N-1 output and a control end, first input end, the second input .... N input, the first output, the second output .... N output, described each input is connected with the output of higher VGA module in described each arbitrary neighborhood two-stage VGA module respectively, described each output is connected with the input of VGA module more rudimentary in described each arbitrary neighborhood two-stage VGA module respectively, and described control end is connected with the second output of described gain control module.Be that first input end is connected with the output of first order VGA module, the first output is connected with the input of second level VGA module, and the second input is connected with second level VGA output, and the second output is connected with the input of third quarter VGA module, by that analogy.
The first order is amplified: the output pin of photoelectric conversion module connects the input pin of first order VGA module, carry out signal amplification, the first input pin of the output pin connecting multi-channel AD signal acquisition module 3 of first order VGA module, carry out AD collection of simulant signal, then the first output pin of multichannel AD signal acquisition module 3 connects the first input pin of gain control module.
Gain control module 1 now start judgement: if now, signals collecting to value be needed a certain fixed value, keep this yield value.
If now, the value that signals collecting arrives, do not reach a certain fixed value, the first output connecting multi-channel DA signal output module 2 inputs of gain control module 1, control multichannel DA signal output module 2 output voltage values to first order VGA module, control the yield value that increases first order VGA, then if multichannel AD signal acquisition module 3 collection signal again, increases yield value through circulation repeatedly, gradually the value that signals collecting arrives, be needed a certain fixed value, keep this yield value.
If it is maximum that the yield value of first order VGA module has reached, also do not reach a certain fixed value of output, open variable connector and select module, carry out second level VGA module and amplify.
Amplify the second level: if signal amplifies through first order VGA module, cannot meet a certain fixed value of output, just open variable connector and select module 4.The second output pin of gain control module 1 connects the control pin that variable connector is selected module 4, gain control module 1 is controlled variable connector and is selected module 4 to select to connect first input end and the first output, first input end connects first order VGA module, the first output connects second level VGA module, the 2nd VGA module is carried out signal amplification, the second input pin of second level VGA output pin connecting multi-channel AD signal acquisition module 3, carry out AD signals collecting, the second output pin of multichannel AD signal acquisition module 3 connects gain control module 1 second input pin, gain control module 1 is carried out the judgement of signals collecting, whether reach a certain fixed value.
The first output connecting multi-channel DA signal output module 2 input pins of gain control module 1, control multichannel DA signal output module output voltage values to second level VGA module, control the yield value that increases second level VGA module.So circulation is gone down.If now, the value that signals collecting arrives, is needed a certain fixed value, keeps this yield value.
If do not reach a certain fixed value, just carry out the VGA module of the third level and amplify.Concrete steps are identical with the step that the VGA module of the second level is amplified.
A kind of cascade connection type AGC system that the utility model provides, being used for realizing automatic gain controls, in a certain scope of input signal, output signal can not change along with the variation of input signal, make AGC system be output as a certain fixed value, through AD sampling module, be sent to gain control module, the large small magnitude of input signal can be detected, DA outputs to the gain control tubulation pin of VGA, can be automatic, the size of ride gain accurately, if input signal amplitude is very little simultaneously, gain not, can automatically open switch module, form cascade connection type AGC system, increase gain ranging, to reach, be output as a certain fixed value, solve small-signal and cannot be amplified to a certain fixed value, expanded the scope of input signal.
Above embodiment is only for illustrating content of the present utility model, and except above-mentioned execution mode, the utility model also has other execution mode, and all employings are equal to replaces or technical scheme that equivalent deformation mode forms all drops in protection range of the present utility model.
Claims (10)
1. a cascade connection type AGC system, is characterized in that, comprising:
N level VGA module, comprises the first order VGA module, the second level VGA module that connect successively ... N level VGA module, and wherein N is not less than 1 integer;
With the AD signal gathering unit that described VGA modules at different levels are connected, the output of described VGA module is connected with the input of described AD collecting unit;
With the gain control module that described AD signal gathering unit is connected, described gain control module is connected with the output of described AD signal acquisition module by input;
The multichannel DA signal output module being connected with described gain control module, described gain control module is connected with the input of described multichannel DA signal output module by the first output, and described DA output module output is connected with the gain control end of described each VGA module;
Be located at the switch element between each adjacent two-stage VGA module, the input of described switch element is connected with the output of higher VGA module in described any two-stage VGA module, the output of described switch element is connected with the input of more rudimentary VGA module, and described switch element is connected with the second output of described gain control module by its control end.
2. cascade connection type AGC system as claimed in claim 1, it is characterized in that, described AD signal gathering unit comprises a multichannel AD signal acquisition module, described multichannel AD signal acquisition module comprises N input, and the input of described AD signal acquisition module is corresponding one by one with described VGA modules at different levels.
3. cascade connection type AGC system as claimed in claim 1, it is characterized in that, described AD signal gathering unit comprises N the AD signal acquisition module connecting one to one with described VGA modules at different levels, described each AD signal acquisition module input is connected with the output of described VGA modules at different levels respectively, and described each AD signal acquisition module respectively output by is separately connected with described gain control module.
4. cascade connection type AGC system as claimed in claim 1, it is characterized in that, described switch element comprises a variable connector selection module, described variable connector selects module to comprise N-1 input, a N-1 output and a control end, described each input is connected with the output of higher VGA module in described each arbitrary neighborhood two-stage VGA module respectively, described each output is connected with the input of VGA module more rudimentary in described each arbitrary neighborhood two-stage VGA module respectively, and described control end is connected with the second output of described gain control module.
5. cascade connection type AGC system as claimed in claim 4, is characterized in that, described gain control module comprises 1 the first output, 1 the second output and N input.
6. cascade connection type AGC system as claimed in claim 1, it is characterized in that, described switch element comprises N-1 switch module, described each switch module is located at respectively between arbitrary neighborhood two-stage VGA module, described each switch module is connected with the output of higher VGA module in described each arbitrary neighborhood two-stage VGA module by its input, described each switch module is connected with the input of VGA module more rudimentary in described each arbitrary neighborhood two-stage VGA module by its output, described each switch module is connected with the second output of described gain control module by its control end respectively.
7. cascade connection type AGC system as claimed in claim 6, is characterized in that, described gain control module comprises 1 the first output, N-1 the second output and N input.
8. cascade connection type AGC system as claimed in claim 1, is characterized in that, described DA signal output module comprises an input port and N output port.
9. cascade connection type AGC system as claimed in claim 1, is characterized in that, it comprises a plurality of DA signal output module, and the output of described each DA signal output module adds up to N, and described each DA signal output module is connected with described gain control module respectively.
10. cascade connection type AGC system as claimed in claim 1, is characterized in that, also comprises a photoelectric conversion module, and described photoelectric conversion module output is connected with described first order VGA module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289822A (en) * | 2019-06-27 | 2019-09-27 | 电子科技大学 | A kind of broadband Larger Dynamic auto-gain circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110289822A (en) * | 2019-06-27 | 2019-09-27 | 电子科技大学 | A kind of broadband Larger Dynamic auto-gain circuit |
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Address after: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee after: INNO INSTRUMENT (CHINA). Inc. Patentee after: INNO INSTRUMENT, Inc. Address before: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee before: INNO INSTRUMENT (WEI HAI) Inc. Patentee before: INNO INSTRUMENT, Inc. |
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Address after: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee after: INNO INSTRUMENT (WEI HAI) Inc. Patentee after: INNO INSTRUMENT, Inc. Address before: 264200 Shandong city of Weihai province Weihai Dalian District Road No. 71 Patentee before: DH INFOTECH (WEIHAI) Inc. Patentee before: INNO INSTRUMENT, Inc. |
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Granted publication date: 20140115 Termination date: 20200729 |