Low-temperature drift detuning self-calibration operational amplifier circuit and design method thereof

A technology of operational amplifiers and design methods, applied in differential amplifiers, improved amplifiers to reduce temperature/supply voltage variations, DC-coupled DC amplifiers, etc. Effects of high voltage gain, low temperature coefficient, low DC offset

Active Publication Date: 2013-06-26
西安航天民芯科技有限公司
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the core module of all power supply products, the reference voltage source has been plagued by insufficient driving ability. Using an operational amplifier as the driving stage can improv

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-temperature drift detuning self-calibration operational amplifier circuit and design method thereof
  • Low-temperature drift detuning self-calibration operational amplifier circuit and design method thereof
  • Low-temperature drift detuning self-calibration operational amplifier circuit and design method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Such as figure 1 As shown, a low-temperature drift offset self-calibration operational amplifier circuit and its design method include a gain stage and an output stage, wherein the gain stage includes 2 gain units and 6 switches; the output stage includes: a bias module composed of a current source , three capacitors, six switches, four P-type MOS tubes and five N-type MOS tubes, figure 2 Given the specific circuit diagram of the gain unit, the gain unit consists of three stages:

[0022] The first stage is the transconductance stage, and the transconductance stage includes: the first P-type MOS transistor MP1, the second P-type MOS transistor MP2, and the third P-type MOS transistor MP3; the first P-type MOS transistor MP1 is the transconductance stage current source , the second P-type MOS transistor MP2 and the third P-type MOS transistor MP3 are P-type differential pair transistors, which constitute the transconductance device of the gain unit and convert the inpu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a low-temperature drift detuning self-calibration operational amplifier circuit and a design method of the low-temperature drift detuning self-calibration operational amplifier circuit. The low-temperature drift detuning self-calibration operational amplifier circuit comprises two gain units, a biased module, three capacitors, a current source, six switches, four P-type metal oxide semiconductor (MOS) pipes and five N-type MOS pipes, wherein each gain unit comprises a capacitor, two resistors, a switch, ten P-type MOS pipes and four N-type MOS pipes. A folded cascade structure is adopted to be used as a gain stage of an amplifier so that high voltage gain and a high power supply rejection ratio can be obtained. Due to the fact that the MOS capacitor is adopted to store, operate and amplify detuning information caused by technology variation, and the detuning information is successively and automatically calibrated when a closed loop is used, low direct current detuning is achieved. A lower temperature coefficient is achieved by adoption of a temperature compensation technology. A high drive capability is obtained by adoption of push-pull output of an AB class.

Description

technical field [0001] The invention belongs to the field of power supplies, in particular to a low-temperature drift offset self-calibration operational amplifier circuit and a design method, which are mainly used in DC / DC converters, AC / DC converters, LED drivers, class D power amplifiers, and high-precision current limiting switch, battery protection chip, etc. Background technique [0002] In recent years, the consumer electronics market has continued to expand, and the field of integrated circuit power supplies has also expanded rapidly. With the increasingly high performance requirements of products, the performance requirements of power supply ICs have also become more and more stringent. As the core module of all power supply products, the reference voltage source has been plagued by insufficient driving ability. Using an operational amplifier as the driving stage can improve the driving ability of the reference voltage source. However, the offset of the operational ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H03F1/30H03F3/45
Inventor 孙权王晓飞袁晓云
Owner 西安航天民芯科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap