Amplifier circuit

An amplifier circuit and operational amplifier technology, applied in high-frequency amplifiers, electrical components, transmission systems, etc., can solve the problem that the output OIP3 is difficult to reach a high level, and achieve the effect of improving performance

Inactive Publication Date: 2014-05-07
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the distortion current i m1 and i m2 The existe

Method used

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  • Amplifier circuit
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Embodiment Construction

[0017] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Such as image 3 The circuit diagram of the present invention shown, a kind of amplifier circuit, comprises input transconductance circuit and output circuit, and described input transconductance circuit comprises operational amplifier OPA, emitter resistance R S and the first transistor Q 1 , the inverting terminal of the operational amplifier OPA is connected to the first transistor Q 1 emitter, the first transistor Q 1 The emitter via the emitter resistor R S After grounding, the first triode Q 1 The base of the operational amplifier OPA is connected to the output terminal, and the non-inverting terminal of the operational amplifier OPA is used as the input terminal of the amplifier circuit, and the output circuit includes a second triode Q 2 , the second transistor Q 2 The emitter is connected to the first transistor Q 1 coll

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Abstract

The invention discloses an amplifier circuit which comprises an input transconductance circuit, an output circuit and a distortion offset feedback loop, wherein the distortion offset feedback loop comprises a third triode, a fourth triode, a fifth triode, a sixth triode, a first resistor and a second resistor, wherein a base electrode of the third triode is connected with that of the fourth triode; an emitting electrode of the third triode is connected with that of the fourth triode; the emitting electrode of the fourth electrode is connected with a bias voltage; a base electrode of the second triode is respectively connected with a collecting electrode of the second triode and a base electrode of the third triode; a base electrode of the fifth triode is connected with that of the six triode; the collecting electrode of the fifth triode is respectively connected with a base plate of the fifth triode and a collecting electrode of the fourth triode; an emitting electrode of the fifth triode is grounded by virtue of the first resistor; a collecting electrode of the six triode is connected to the emitting electrode of the second triode; an emitting electrode of the sixth triode is grounded by virtue of the second resistor. According to the amplifier circuit, a distortion offset technology is adopted, so that the OIP3 output performance is improved.

Description

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Claims

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Application Information

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Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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