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Reconfigurable operational amplifier

An operational amplifier and amplifier technology, applied in the field of operational amplifiers, can solve the problems of insufficient reusability of reconfigurable operational amplifiers

Active Publication Date: 2021-05-28
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a reconfigurable operational amplifier to solve the problem of insufficient reusability of the prior art reconfigurable operational amplifier

Method used

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Such as image 3 As shown, a reconfigurable operational amplifier includes a telescopic cascode operational amplifier structure. The telescopic cascode operational amplifier structure includes two sets of common-gate PMOS transistor pairs V1 and V2, a A group of common-gate NMOS transistor pairs V3 and a group of common-gate NMOS transistor pairs V4, each group of common-gate PMOS transistor pairs is composed of two common-gate PMOS transistors, and the common-gate NMOS transistor pair V2 It is composed of two NMOS transistors whose gates are connected together, and the NMOS transistor pair V4 with vacant gates is composed of two NMOS transistors with vacant gates;

[0036] Among the two sets of common-gate PMOS transistor pairs V1 and V2, the sources of the two PMOS transistors of the first group of common-gate PMOS transistor pair V1 are conne...

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Abstract

The invention discloses a reconfigurable operational amplifier which comprises a sleeve type cascode operational amplifier structure, and switches are connected between drain electrodes and source electrodes of part of MOS tubes in the sleeve type cascode operational amplifier structure respectively. Two working states of the cascode operational amplifier and the differential single-tube amplifier are switched by controlling on and off of the switch. The reusability of the operational amplifier is greatly improved, extra design overhead is reduced, and due to the fact that the operational amplifier is designed on the basis of a cascode operational amplifier, extra power consumption cannot be increased.

Description

technical field [0001] The invention relates to the field of operational amplifiers, in particular to a reconfigurable operational amplifier. Background technique [0002] In the field of mixed signals, operational amplifiers are widely used. One of the important application areas is the analog-to-digital converter (ADC). Most of the signals in nature are analog signals. The analog-to-digital converter can convert analog signals into digital signals for digital Processor (DSP) processing. At present, some mainstream ADCs such as pipeline ADC and delta-sigma ADC need to use operational amplifiers. The accuracy and speed of ADC are largely restricted by the speed and accuracy of operational amplifiers. . [0003] Pipeline-type analog-to-digital converters mainly occupy the high-speed, medium-high-precision ADC market at present. It is an ADC structure that obtains digital output results through multi-step comparison. Taking the 12-stage pipeline as an example, its basic bloc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20
CPCH03F3/20Y02D30/70
Inventor 幸新鹏刘森基尚雪倩冯海刚王志华李冬梅
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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