CN203225708U - Instrumentation amplifier circuit - Google Patents
Instrumentation amplifier circuit Download PDFInfo
- Publication number
- CN203225708U CN203225708U CN 201320187961 CN201320187961U CN203225708U CN 203225708 U CN203225708 U CN 203225708U CN 201320187961 CN201320187961 CN 201320187961 CN 201320187961 U CN201320187961 U CN 201320187961U CN 203225708 U CN203225708 U CN 203225708U
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- Prior art keywords
- resistance
- operational amplifier
- resistor
- signal output
- amplifier
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Abstract
The utility model discloses an instrumentation amplifier circuit which comprises a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor. An inverted input end of the first operational amplifier is a first voltage input end, a non-inverting input end of the first operational amplifier is respectively connected with a first end of the third resistor and a first end of the fifth resistor, a signal output end of the first operational amplifier is respectively connected with a first end of the first resistor and a second end of the third resistor, and a second end of the fifth resistor is respectively connected with a first end of the fourth resistor and an inverted input end of the second operational amplifier. The instrumentation amplifier circuit is simple in structure, low in cost and high in power, and has popularization and utilization value.
Description
Technical field
The utility model relates to a kind of amplifying circuit, relates in particular to a kind of instrument amplifier circuit.
Background technology
Amplifying circuit is very common in the field of electronics, its essence is with the smaller input signal of energy to control another energy, makes in the load of output and obtains the bigger signal of power ratio.The citation form of amplifying circuit has three kinds: the common emitter amplifying circuit, common-base amplification circuit and common collector amplifying circuit by the combination of these three kinds of citation forms, have formed multiple amplifier.Using now the widest is integrated amplifier based on transistor (bipolar transistor or field-effect transistor) amplifying circuit.Because the restriction of material and transistor parameter, the voltage that this kind amplifying circuit can drive is low, and power is little, can not meet customer need.
The utility model content
The purpose of this utility model with regard to be to provide in order to address the above problem a kind of simple in structure, cost is low, high-power instrument amplifier circuit.
In order to achieve the above object, the utility model has adopted following technical scheme:
A kind of instrument amplifier circuit, comprise first operational amplifier, second operational amplifier, the 3rd operational amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, the inverting input of described first operational amplifier is first voltage input end, the in-phase input end of described first operational amplifier is connected with first end of described the 3rd resistance and first end of described the 5th resistance respectively, the signal output part of described first operational amplifier is connected with first end of described first resistance and second end of described the 3rd resistance respectively, second end of described the 5th resistance is connected with first end of described the 4th resistance and the inverting input of described second operational amplifier respectively, the in-phase input end of described second operational amplifier is second voltage input end, the signal output part of described second operational amplifier is connected with second end of described the 4th resistance and first end of described the 6th resistance respectively, second end of described the 6th resistance is connected with the in-phase input end of described the 3rd operational amplifier and first end of described the 7th resistance respectively, the second end ground connection of described the 7th resistance, the inverting input of described the 3rd operational amplifier is connected with second end of described first resistance and first end of described second resistance respectively, second end of described second resistance is connected with the signal output part of described the 3rd operational amplifier, and the signal output part of described the 3rd operational amplifier is voltage output end.
The beneficial effects of the utility model are:
A kind of instrument amplifier circuit of the utility model simple in structure, cost is low, and power is big.
Description of drawings
Fig. 1 is the circuit diagram of a kind of instrument amplifier circuit of the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of instrument amplifier circuit of the utility model, comprise the first operational amplifier IC1, the second operational amplifier IC2, the 3rd operational amplifier IC3, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7, the inverting input of the first operational amplifier IC1 is first voltage input end, the in-phase input end of the first operational amplifier IC1 is connected with first end of the 3rd resistance R 3 and first end of the 5th resistance R 5 respectively, the signal output part of the first operational amplifier IC1 is connected with first end of first resistance R 1 and second end of the 3rd resistance R 3 respectively, second end of the 5th resistance R 5 is connected with first end of the 4th resistance R 4 and the inverting input of the second operational amplifier IC2 respectively, the in-phase input end of the second operational amplifier IC2 is second voltage input end, the signal output part of the second operational amplifier IC2 is connected with second end of the 4th resistance R 4 and first end of the 6th resistance R 6 respectively, second end of the 6th resistance R 6 is connected with the in-phase input end of the 3rd operational amplifier IC3 and first end of the 7th resistance R 7 respectively, the second end ground connection of the 7th resistance R 7, the inverting input of the 3rd operational amplifier IC3 is connected with second end of first resistance R 1 and first end of second resistance R 2 respectively, second end of second resistance R 2 is connected with the signal output part of the 3rd operational amplifier IC3, and the signal output part of the 3rd operational amplifier IC3 is voltage output end.
Claims (1)
1. instrument amplifier circuit, it is characterized in that: comprise first operational amplifier, second operational amplifier, the 3rd operational amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, the inverting input of described first operational amplifier is first voltage input end, the in-phase input end of described first operational amplifier is connected with first end of described the 3rd resistance and first end of described the 5th resistance respectively, the signal output part of described first operational amplifier is connected with first end of described first resistance and second end of described the 3rd resistance respectively, second end of described the 5th resistance is connected with first end of described the 4th resistance and the inverting input of described second operational amplifier respectively, the in-phase input end of described second operational amplifier is second voltage input end, the signal output part of described second operational amplifier is connected with second end of described the 4th resistance and first end of described the 6th resistance respectively, second end of described the 6th resistance is connected with the in-phase input end of described the 3rd operational amplifier and first end of described the 7th resistance respectively, the second end ground connection of described the 7th resistance, the inverting input of described the 3rd operational amplifier is connected with second end of described first resistance and first end of described second resistance respectively, second end of described second resistance is connected with the signal output part of described the 3rd operational amplifier, and the signal output part of described the 3rd operational amplifier is voltage output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320187961 CN203225708U (en) | 2013-04-15 | 2013-04-15 | Instrumentation amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320187961 CN203225708U (en) | 2013-04-15 | 2013-04-15 | Instrumentation amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203225708U true CN203225708U (en) | 2013-10-02 |
Family
ID=49252698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320187961 Expired - Fee Related CN203225708U (en) | 2013-04-15 | 2013-04-15 | Instrumentation amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203225708U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509626A (en) * | 2015-11-25 | 2016-04-20 | 上海工程技术大学 | Instrument amplification circuit for micro displacement testing |
-
2013
- 2013-04-15 CN CN 201320187961 patent/CN203225708U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509626A (en) * | 2015-11-25 | 2016-04-20 | 上海工程技术大学 | Instrument amplification circuit for micro displacement testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20140415 |