CN203026930U - Circuit for solving voltage overload of input port of operational amplifier - Google Patents
Circuit for solving voltage overload of input port of operational amplifier Download PDFInfo
- Publication number
- CN203026930U CN203026930U CN 201220633751 CN201220633751U CN203026930U CN 203026930 U CN203026930 U CN 203026930U CN 201220633751 CN201220633751 CN 201220633751 CN 201220633751 U CN201220633751 U CN 201220633751U CN 203026930 U CN203026930 U CN 203026930U
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- China
- Prior art keywords
- diode
- input port
- circuit
- phase end
- operational amplifier
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Amplifiers (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The utility model discloses a circuit for solving voltage overload of an input port of an operational amplifier. A diode D1 and a diode D2 which are reversely connected in parallel are connected at the same phase end and the opposite phase end of the circuit, the anode of the diode D1 is connected with the opposite phase end, the cathode of the diode D1 is connected with the same phase end, the cathode of the diode D2 is connected with the opposite phase end, and the anode of the diode D2 is connected with the same phase end. According to the utility model, the voltage difference is 0.7V by means of the voltage characteristics of the diodes after electrification, and the diodes are used for clamping high voltage to protect the input port of the operational amplifier.
Description
Technical field
The utility model relates to the applied technical field of amplifier, particularly a kind of circuit that solves amplifier input port voltage overload.
Background technology
General amplifier input is not connected to any protection, and its shortcoming is in circuit, if prime output has a little abnormal amplifier input terminal voltage rated value that surpasses, can cause amplifier to be burnt or the amplifier performance change.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of circuit that solves amplifier input port voltage overload, utilizes the characteristic of diode, and after conducting, voltage stabilization within the specific limits.
To achieve these goals, the technical solution adopted in the utility model is:
A kind of circuit that solves amplifier input port voltage overload is connected to diode D1 and the diode D2 of reverse parallel connection at its in-phase end and end of oppisite phase, the anode of diode D1 connects backward end, and negative electrode connects in-phase end, and the negative electrode of diode D2 connects end of oppisite phase, and anode connects in-phase end.
Compared with prior art, the utility model utilizes the volt of diode to press characteristic, and after conducting, pressure reduction at 0.7V, uses diode clamp to live high voltage, the input port of protection amplifier.
Description of drawings
Accompanying drawing is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is carried out more detailed explanation.
As shown in the figure, the utility model is a kind of circuit that solves amplifier input port voltage overload, this amplifier is the dual power supply amplifier, signal inputs to in-phase end after resistance R 1, backward end passes through R2 ground connection of point, and in-phase end and end of oppisite phase are connected to diode D1 and the diode D2 of reverse parallel connection, the anode of diode D1 connects backward end, negative electrode connects in-phase end, and the negative electrode of diode D2 connects end of oppisite phase, and anode connects in-phase end.
When adopting this structure, can see, when the pressure reduction of the Vin+ of input and Vin-during less than 0.7V, diode D1 and D2 cut-off, the amplifier input terminal voltage is unaffected, the amplifier normal operation.
When the pressure reduction of the Vin+ of input and Vin-during greater than 0.7V, diode D1 and D2 conducting, the input terminal voltage clamper has been protected input port at 0.7V.Guaranteed the reliability application of amplifier.
Claims (1)
1. a circuit that solves amplifier input port voltage overload, is characterized in that, is connected to diode D1 and the diode D2 of reverse parallel connection at its in-phase end and end of oppisite phase, the anode of diode D1 connects backward end, negative electrode connects in-phase end, and the negative electrode of diode D2 connects end of oppisite phase, and anode connects in-phase end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633751 CN203026930U (en) | 2012-11-26 | 2012-11-26 | Circuit for solving voltage overload of input port of operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633751 CN203026930U (en) | 2012-11-26 | 2012-11-26 | Circuit for solving voltage overload of input port of operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203026930U true CN203026930U (en) | 2013-06-26 |
Family
ID=48650882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220633751 Expired - Fee Related CN203026930U (en) | 2012-11-26 | 2012-11-26 | Circuit for solving voltage overload of input port of operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203026930U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326344A (en) * | 2013-07-03 | 2013-09-25 | 华北电力大学 | Overvoltage limiting circuit |
-
2012
- 2012-11-26 CN CN 201220633751 patent/CN203026930U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326344A (en) * | 2013-07-03 | 2013-09-25 | 华北电力大学 | Overvoltage limiting circuit |
| CN103326344B (en) * | 2013-07-03 | 2015-10-28 | 华北电力大学 | A kind of overvoltage limiting circuit |
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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: 20130626 Termination date: 20131126 |