CN206272578U - A kind of dual adjustable gain amplifier circuit - Google Patents
A kind of dual adjustable gain amplifier circuit Download PDFInfo
- Publication number
- CN206272578U CN206272578U CN201621392485.4U CN201621392485U CN206272578U CN 206272578 U CN206272578 U CN 206272578U CN 201621392485 U CN201621392485 U CN 201621392485U CN 206272578 U CN206272578 U CN 206272578U
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- Prior art keywords
- amplifying circuit
- gain
- circuit
- coarse adjustment
- fine setting
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Abstract
The utility model discloses a kind of dual adjustable gain amplifier circuit, including primary amplifying circuit, also include that Continual Gain Actuator amplifies the fine setting gain amplifying circuit of regulation and the coarse adjustment gain amplifying circuit of the adjustment digital gain order of magnitude, the input of the output end connection fine setting gain amplifying circuit of the primary amplifying circuit, the output end connection coarse adjustment gain amplifying circuit input of the fine setting gain amplifying circuit.The utility model improves compatibility of the circuit to different range signals as a result of fine setting gain amplifying circuit and the combinational circuit of coarse adjustment gain amplifying circuit；Efficiently solve multiplication factor and amplify the contradiction of precision.
Description
Technical field
The utility model is related to a kind of dual gain adjusting circuit, more particularly to a kind of dual adjustable gain amplifier electricity
Road.
Background technology
At present, accurately check product, particularly medicinal inspection equipment, precision to input signal and model can be received
The requirement enclosed is all higher.Therefore, circuit signal amplify precision and can receive amplitude range size can all have influence on it is whole
Machine to the identification of signal with judge, such as the whole machine of medical cellanalyzer to the identification of signal with judge.
For the amplification of signal, current technology is all expanded using adjustable gain can receive the scope of signal.General
Amplifying circuit realizes the adjustable of gain using adjustable potentiometer.The output resistance of adjustable potentiometer is mainly used as electricity
The feedback resistance on road, feedback resistance is changed by adjusting potentiometer, so as to change the gain amplifier of circuit.
However, prior art has some limitations, i.e., exist between signal enlargement range and signal difference sensitivity
Contradiction.Contradiction is as follows：(1) if in order to amplify small-signal, very big multiplication factor will weaken the precision of adjustable gain；
(2) if to meet the precision of adjustable gain, the amplitude range that can receive signal will be reduced.
Therefore, prior art has yet to be improved and developed.
Utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of dual adjustable gain amplifier electricity
Road, it is intended to solve prior art for that can receive signal amplitude and amplify the contradiction between precision.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of dual adjustable gain amplifier circuit, including primary amplifying circuit, wherein, also amplify including Continual Gain Actuator and adjust
Fine setting gain amplifying circuit and adjustment the digital gain order of magnitude coarse adjustment gain amplifying circuit, the primary amplifying circuit it is defeated
Go out the input of end connection fine setting gain amplifying circuit, the output end connection coarse adjustment gain of the fine setting gain amplifying circuit is amplified
Circuit input end.
Described dual adjustable gain amplifier circuit, wherein, primary amplifying circuit is across resistance amplifying circuit (IV conversion electricity
Road).Input signal acts on the first input end of primary amplifying circuit；Second input end grounding of primary amplifying circuit；It is primary
The output end of amplifying circuit is connected by a resistance with the first input end of primary amplifying circuit.It is described to be used across resistance amplifying circuit
Amplify to realize that low current signal is converted into the primary of voltage signal.Preferably, primary amplifying circuit can be amplified across resistance
Circuit (IV change-over circuits) or amplifying circuit.
Described dual adjustable gain amplifier circuit, wherein, fine setting gain amplifying circuit includes adjustable potentiometer and computing
Amplifier, the first input end for finely tuning gain amplifying circuit is connected by a resistance with the output end of primary amplifying circuit；It is micro-
Adjust gain amplifying circuit the and input end grounding；The output end for finely tuning gain amplifying circuit is increased by adjustable potentiometer with fine setting
The first input end series connection of beneficial amplifying circuit.The adjustable potentiometer refers to digital regulation resistance, the digital regulation resistance be by
Overall electrical resistance mean allocation has numeral write-in port into certain share, and different shares are write by digital form, shows not
Same resistance value.It is described fine setting gain amplifying circuit mainly the adjustable potentiometer come by way of changing feedback resistance come reality
Now to the amplification of signal.The adjustable potentiometer can be digital regulation resistance, mechanical slip rheostat or change resistance resistance
The electronic device of value.
Described dual adjustable gain amplifier circuit, wherein, the coarse adjustment gain amplifying circuit includes the mould of controllable multiselect one
Intend switch and operational amplifier, the first input end of coarse adjustment gain amplifying circuit is by a resistance and fine setting gain amplifying circuit
Output end series connection；Second input end grounding of coarse adjustment gain amplifying circuit；The output end of coarse adjustment gain amplifying circuit passes through one
Individual analog switch is connected with the first input end of coarse adjustment gain amplifying circuit.The coarse adjustment gain amplifying circuit is selected by control eight
One analog switch accesses the feedback resistance of operational amplifier to change, so as to change the gain quantity of whole operational amplification circuit
Level.The analog switch of the multiselect one can be unidirectional and/or two-way, it is also possible to or the multiselect one of other forms is switched.It is excellent
Choosing, the analog switch of the multiselect one is eight to select an analog switch, and described eight select the analog switch to have eight inputs, and one defeated
Go out the tunnel control ports of Duan He tri-.
The dual adjustable gain amplifier circuit that the utility model is provided, has the advantages that：
(1) compatibility of the circuit to different range signals can be improved, same amplifying circuit is used, you can with to by a small margin
Signal is amplified treatment, it is also possible to be amplified treatment to significantly signal, improves operational amplification circuit to different amplitudes
The disposal ability of signal；
(2) two-stage adjustable gain amplifier, one-level is used to be used for improving the precision of gain amplifier, another level increases to improve to amplify
The overall quantity level of benefit, can efficiently solve multiplication factor and amplify the contradiction of precision.
(3) digital regulation resistance that the amplifying circuit is used and the analog switch of multiselect one, can improve operational amplification circuit
Configuration flexibility.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model dual adjustable gain amplifier circuit.
Specific embodiment
The utility model provides a kind of dual adjustable gain amplifier circuit, to make the purpose of this utility model, technical side
Case and effect are clearer, clear and definite, referring to the drawings and give an actual example to the utility model further describe.Should manage
Solution, specific embodiment described herein is only used for explaining the utility model, is not used to limit the utility model.
Refering to Fig. 1, dual adjustable gain amplifier circuit of the present utility model includes primary amplifying circuit 101, secondary amplification
Circuit 102 and three-stage amplifier 103.
The primary amplifying circuit 101 is across resistance amplifying circuit (IV change-over circuits) or amplifying circuit.It is described across resistance
Amplifying circuit is used for realizing the primary amplification that low current signal is converted into voltage signal.Input signal acts on primary amplification electricity
The first input end 20 on road；Second input 21 of primary amplifying circuit is grounded；The output end 23 of primary amplifying circuit passes through one
Individual resistance is connected with the first input end 20 of primary amplifying circuit.
The fine setting gain amplifying circuit 102 includes adjustable potentiometer 201 and operational amplifier.The adjustable potentiometer
201 is a kind of adjustable electronic component, is rotated by a resistive element and one or sliding system is constituted.When the cunning of adjustable potentiometer
When dynamic system slides into the other end by one end, the resistance value that the potentiometer shows is different.Adjustable potentiometer is digital regulation resistance
Or mechanical slip rheostat, can also be the related device for changing resistance.What the adjustable potentiometer in the circuit referred to
Digital regulation resistance, the digital regulation resistance be by overall electrical resistance mean allocation into certain share, and have numeral write-in port, lead to
Cross digital form and write different shares, show different resistance values.The fine setting gain amplifying circuit 102 is mainly by described
, come the amplification that changes the mode of feedback resistance to realize to signal, general this grade of gain amplifier scope is small, essence for adjustable potentiometer 201
Degree is high, and can realize that Continual Gain Actuator is adjusted.Finely tune gain amplifying circuit first input end 24 by a resistance with it is first
The output end 23 of level amplifying circuit 101 is connected；The second input 25 for finely tuning gain amplifying circuit is grounded；Electricity is amplified in fine setting gain
The output end 26 on road is connected by adjustable potentiometer 201 with the first input end 24 of fine setting gain amplifying circuit.
The principle of the coarse adjustment gain amplifying circuit 103 is consistent with fine setting amplifying circuit, mainly including the mould of controllable multiselect one
Intend switch 301 and operational amplifier.Analog switch mainly plays a part of to connect signal or cut-off signal in the electronic device.Multiselect
One analog switch 301 is unidirectional or two-way, or the multiselect one of other forms switchs.Coarse adjustment gain described in the present embodiment
Amplifying circuit 103 uses eight and selects an analog switch, and described eight select the analog switch to have eight inputs, an output end and
Three tunnel control ports；By configuring the low and high level of three tunnel control ports, can with control output end and different input UNICOMs,
So as to play a part of software control.The coarse adjustment gain amplifying circuit 103 selects an analog switch 301 to change by control eight
The feedback resistance of operational amplifier is accessed, so as to change the gain number magnitude of whole operational amplification circuit.The coarse adjustment gain is put
The gain ranging of the big circuit of circuit 103 is big, discontinuously, is used only to adjust the order of magnitude of digital gain.Electricity is amplified in coarse adjustment gain
The first import and export end 27 on road goes out end 26 and connects by a resistance with the input of fine setting gain amplifying circuit；Coarse adjustment gain is amplified
Second input 28 of circuit is grounded；The output end 29 of coarse adjustment gain amplifying circuit is increased by an analog switch 301 with coarse adjustment
The first input end 27 of beneficial amplifying circuit is connected.
The dual adjustable gain amplifier circuit that the utility model is provided can improve compatibility of the circuit to different range signals
Property, using same amplifying circuit, you can be amplified treatment to small amplitude signal, it is also possible to which significantly signal is amplified
Treatment, improves disposal ability of the operational amplification circuit to different range signals；Secondly, using two-stage adjustable gain amplifier, one
Level is used for improving the precision of gain amplifier, and another level improves the overall quantity level of gain amplifier, can efficiently solve amplification
Multiple and the contradiction for amplifying precision.Finally, the amplifying circuit is used digital regulation resistance and the analog switch of multiselect one, Ke Yiti
The configuration flexibility of operational amplification circuit high.
The utility model is described in detail above, for those of ordinary skills, can be according to upper
State it is bright improved or converted, and all these modifications and variations should all belong to the protection of the utility model appended claims
Scope.
Claims (5)
1. a kind of dual adjustable gain amplifier circuit, including primary amplifying circuit, it is characterised in that：Also amplify including Continual Gain Actuator
The fine setting gain amplifying circuit of regulation and the coarse adjustment gain amplifying circuit of the adjustment digital gain order of magnitude, the primary amplifying circuit
Output end connection fine setting gain amplifying circuit input, the fine setting gain amplifying circuit output end connection coarse adjustment gain
Input amplifier.
2. dual adjustable gain amplifier circuit according to claim 1, it is characterised in that：
Fine setting gain amplifying circuit includes adjustable potentiometer and operational amplifier, and the first input end for finely tuning gain amplifying circuit leads to
A resistance is crossed to be connected with the output end of primary amplifying circuit；Finely tune the second input end grounding of gain amplifying circuit；Fine setting increases
The output end of beneficial amplifying circuit is connected by adjustable potentiometer with the first input end of fine setting gain amplifying circuit.
3. dual adjustable gain amplifier circuit according to claim 1, it is characterised in that：The coarse adjustment gain amplifying circuit
Including the analog switch of controllable multiselect one and operational amplifier, the first input end of coarse adjustment gain amplifying circuit by a resistance with
Finely tune the output end series connection of gain amplifying circuit；Second input end grounding of coarse adjustment gain amplifying circuit；Electricity is amplified in coarse adjustment gain
The output end on road is connected by an analog switch with the first input end of coarse adjustment gain amplifying circuit.
4. dual adjustable gain amplifier circuit according to claim 2, it is characterised in that：The adjustable potentiometer is numeral
The electronic device of potentiometer, mechanical slip rheostat or change resistance.
5. dual adjustable gain amplifier circuit according to claim 3, it is characterised in that：
The analog switch of the multiselect one is eight to select an analog switch, and described eight select the analog switch to have eight inputs, and one defeated
Go out the tunnel control ports of Duan He tri-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621392485.4U CN206272578U (en) | 2016-12-16 | 2016-12-16 | A kind of dual adjustable gain amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621392485.4U CN206272578U (en) | 2016-12-16 | 2016-12-16 | A kind of dual adjustable gain amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206272578U true CN206272578U (en) | 2017-06-20 |
Family
ID=59046178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621392485.4U Active CN206272578U (en) | 2016-12-16 | 2016-12-16 | A kind of dual adjustable gain amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206272578U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270410A (en) * | 2018-02-06 | 2018-07-10 | 华中科技大学 | A kind of bandwidth adjustable programmable amplifier multistage with gain and control method |
| CN109991901A (en) * | 2019-04-08 | 2019-07-09 | 奇瑞汽车股份有限公司 | A kind of the number circuit and method of battery management system |
| CN115642889A (en) * | 2022-11-17 | 2023-01-24 | 四川思凌科微电子有限公司 | AGC method and system applied to chrip communication |
-
2016
- 2016-12-16 CN CN201621392485.4U patent/CN206272578U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270410A (en) * | 2018-02-06 | 2018-07-10 | 华中科技大学 | A kind of bandwidth adjustable programmable amplifier multistage with gain and control method |
| CN108270410B (en) * | 2018-02-06 | 2020-05-19 | 华中科技大学 | Bandwidth and gain multi-stage adjustable program control amplifier and control method |
| CN109991901A (en) * | 2019-04-08 | 2019-07-09 | 奇瑞汽车股份有限公司 | A kind of the number circuit and method of battery management system |
| CN115642889A (en) * | 2022-11-17 | 2023-01-24 | 四川思凌科微电子有限公司 | AGC method and system applied to chrip communication |
| CN115642889B (en) * | 2022-11-17 | 2023-06-02 | 四川思凌科微电子有限公司 | AGC method and system applied to chrip communication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20200528 Granted publication date: 20170620 |
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| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20220919 Granted publication date: 20170620 |