Two-Stage Operational Amplifier

An operational amplifier and operational amplification technology, applied in the direction of amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of amplifier overall performance limitations, noise (large flicker noise, etc.), achieve high gain, increase gain, and ensure stability Effect

Active Publication Date: 2019-11-26
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the existing two-stage operational amplifier can provide high gain, its own noise (flicker noise and thermal noise) is relatively large, which limits the overall performance improvement of the amplifier.

Method used

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  • Two-Stage Operational Amplifier
  • Two-Stage Operational Amplifier
  • Two-Stage Operational Amplifier

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Embodiment Construction

[0078] In order for those skilled in the art to better understand the technical solution of the present invention, a two-stage operational amplifier provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0079] figure 1 A schematic structural diagram of a two-stage operational amplifier provided for an embodiment of the present invention, such as figure 1 As shown, the two-stage operational amplifier includes: a bias voltage generation unit 1 , a first-stage operational amplification unit and a second-stage operational amplification unit.

[0080] Wherein, the bias voltage generating unit 1 is connected to the first-stage operational amplifier unit 2 and the second-stage operational amplifier unit 4, and is used to provide corresponding bias to the first-stage operational amplifier unit 2 and the second-stage operational amplifier unit 4. Voltage.

[0081] The first-stage operational amplification unit 2 is connecte...

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Abstract

A two-stage operational amplifier is provided to comprise a bias voltage generator, a first stage operational amplifier and a second stage operational amplifier, wherein the first stage operational amplifier comprises a folded cascode amplifier circuit and a cross coupling load, the cross coupling load is coupled to a load differential pair in the folded cascode amplifier circuit, the cross coupling load comprises two transistors, the two transistors in the cross coupling load and two transistors in the load differential pair constitute two current mirror structures, which are cross coupled. In the solution, the cross coupling load is added to the load differential pair in the folded cascode amplifier circuit, to increase gain of the two-stage operational amplifier by using positive feedback and negative conductance gain enhancement technology; while parameters of MOSFETs in the folded cascode amplifier circuit are properly set to reduce noise of the two-stage operational amplifier.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a two-stage operational amplifier. Background technique [0002] Operational amplifiers are an important part of many analog systems and mixed-signal systems, and high DC gain is undoubtedly an important design indicator for operational amplifiers. Since operational amplifiers are generally used to implement a feedback system, the magnitude of the open-loop DC gain determines the accuracy of the feedback system using operational amplifiers. [0003] At present, a two-stage operational amplifier based on a folded cascode structure can provide a relatively large output voltage swing while providing a relatively high gain. Specifically, the first-stage amplifier is used to achieve high gain and provide proper swing, and the second-stage amplifier is used to increase the output swing. However, although the existing two-stage operational amplifier can provide high gain, its own noise (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/14H03F1/26H03F3/45
CPCH03F1/14H03F1/26H03F3/45417H03F2203/45096H03F1/0205H03F3/3022H03F3/45192H03F3/45636H03F2203/45644H03F1/02H03F2203/45051
Inventor 孙高明郑喆奎栗首
Owner BOE TECH GRP CO LTD
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