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A circuit for canceling the input current of an operational amplifier

An operational amplifier, input current technology, applied in the direction of amplifier input/output impedance improvement, amplifier improvement to reduce temperature/power supply voltage changes, differential amplifiers, etc., can solve the problems of poor application effect of the input stage, and achieve low offset voltage and noise low, reducing the effect of input current

Active Publication Date: 2022-06-03
成都芯翼科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is a kind of counteracting circuit of operational amplifier input current, is used to solve the technical problem that the application effect of the input stage of operational amplifier in the prior art is relatively poor

Method used

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  • A circuit for canceling the input current of an operational amplifier
  • A circuit for canceling the input current of an operational amplifier

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Experimental program
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Effect test

Embodiment

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[0064] Among them, represents the emitter current of the fourth PNP transistor Q9.

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Abstract

The invention discloses an input current offset circuit of an operational amplifier, comprising: a differential input stage, an input current offset circuit and an output stage; the first end of the differential input stage is connected to the first end of the input current offset circuit and then connected to a positive and negative The input terminal, the second terminal of the differential input stage is connected to the second terminal of the input current offset circuit and then connected to the power supply, and the third terminal of the differential input stage is connected to the third terminal of the input current offset circuit and then connected to the bias voltage. The fourth end of the input stage is connected to the fourth end of the input current offset circuit and then grounded; the fifth end of the differential input stage is connected to the first end of the output stage, and the second end of the output stage is connected to the voltage output end. The invention greatly reduces the input current of the differential input stage, and realizes that the input impedance of the operational amplifier approaches infinity.

Description

A circuit for canceling the input current of an operational amplifier technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a cancelling circuit for an input current of an operational amplifier. Background technique Operational amplifiers are widely used in various electronic circuits or integrated circuits, and operational amplifiers are used in different electronic products. The device plays a very important role as the basic core device. Operational amplifiers are used in a wide variety of circuits without The same application scenario will "idealize" the common parameters of the op amp, such as idealizing its input resistance to infinity is large, idealizing the output resistance to be very small, while idealizing the input offset voltage to zero. However, these idealized parameters are difficult to achieve in practice because the input stage of an operational amplifier is There are often bipolar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F1/30H03F1/26H03F1/56
Inventor 洪锋明
Owner 成都芯翼科技有限公司