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Loop operation amplification circuit resisting to PV change

An operational amplifier circuit and circuit technology, which is applied in the field of high-precision operational amplifier design, can solve problems such as loop operational amplifier oscillation and precision changes, and achieve the effect of improving stability and accuracy

Inactive Publication Date: 2018-03-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The change of the bias will cause the risk of oscillation of the loop op amp, and at the same time, the accuracy will also change, which is not desirable in the design of the op amp

Method used

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  • Loop operation amplification circuit resisting to PV change
  • Loop operation amplification circuit resisting to PV change
  • Loop operation amplification circuit resisting to PV change

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Embodiment Construction

[0019] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, the present invention provides a loop operational amplifier circuit resistant to PV changes, which is in image 3 The improvement on the basis of the loop operational amplifier shown is mainly to add a capacitor between the output of the second-stage inverter and the input of the third-stage inverter. When the phase is reset, a fixed bias voltage is used to provide the third The input of the first stage is set with a DC bias, and when the phase is amplified, the bias circuit is disconnected, and the third stage and the second stage are coupled through a capacitor.

[0021] The loop operational amplifier circuit provided by the present invention includes a three-stage cascaded inverter and a bias circuit, wherein the three-stage cascaded inverter includes a first NMOS transistor NM1, ...

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Abstract

The invention discloses a loop operation amplification circuit resisting to PV change. The loop operation amplification circuit includes a three-level cascading inverter, and a biasing circuit connected between a second level inverter and a third level inverter of the three-level cascading inverter. The loop operation amplification circuit directly applies a biasing voltage for controlling the stability and precision of operation amplification to a grid of the third level inverter, and is spaced from a second level inverter output through a capacitor; in a resetting phase, a second level output and a third level input have DC bias voltage; and in a working phase, the second level output and the third level input are AC-coupled through a capacitor, bias change due to techniques and power supply voltage change can be avoided, and the stability and precision of loop operation amplification can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-precision operational amplifier design, in particular to a circuit structure of loop operational amplifier bias technology. Background technique [0002] With the gradual reduction of the size of the integrated circuit process, the intrinsic gain of the MOS transistor decreases, and at the same time, the power supply voltage decreases, making the design of high-gain operational amplifiers more and more difficult; in addition, most traditional operational amplifiers have relatively high power consumption. It also limits its scope of application. The loop op amp was first proposed by Benjamin Hershberg in 2012 and is used in pipeline analog-to-digital converters. Loop operational amplifiers have low power consumption, simple structure, and easy size reduction, so they have high research prospects. [0003] The stability and accuracy of the loop op amp are closely related to its bias circuit. Now the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/16
CPCH03F1/30H03F3/16
Inventor 吴建辉王鹏孙杰李红包天罡王甫锋
Owner SOUTHEAST UNIV