Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High Precision Fully Differential Amplifier Based on Chopper Technology

A fully differential amplifier, high-precision technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce noise effects, etc., can solve problems such as signal frequency band noise, to eliminate noise, reduce mismatching, and increase bandwidth Effect

Inactive Publication Date: 2016-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional A / D converter is mainly composed of analog circuits, the matching error of circuit components has a great influence on the accuracy of the A / D converter, and will introduce noise in the signal frequency band

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
  • High Precision Fully Differential Amplifier Based on Chopper Technology
  • High Precision Fully Differential Amplifier Based on Chopper Technology
  • High Precision Fully Differential Amplifier Based on Chopper Technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0024] In the design of a fully differential operational amplifier, compared with the single-ended working state, the advantages are that it can effectively suppress common-mode noise, larger output voltage swing, simpler bias circuit, and higher output linearity. Ideally, a fully differential op amp can achieve very high precision. However, in practical applications, due to the mismatch of differential pair tubes, current mirroring errors, and other undesirable characteristics in the low-frequency or DC noise range, offset voltage and 1 / f noise will be introduced at the differential input. In high-gain amplifiers, the output common-mode level is quite sensitive to device characteristics and mismatches, and cannot be stabilized by differential feedback, so common-mode feedback is required for high-gain differential circuits. Compared with traditional sampling...

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 integrated circuit technology, in particular to a high-precision full differential amplifier based on chopper technology, which uses common-mode feedback technology and chopper technology to reduce offset and noise. The high-precision full differential amplifier based on chopper technology of the present invention mainly adopts chopper technology and capacitor common-mode feedback technology, and the chopper module is composed of two multipliers and two operational amplifiers, wherein the two Clock control, the input signal VIN enters the first multiplier for modulation; the modulated signal enters the first operational amplifier for amplification; the output signal is reversed and enters the second multiplier for demodulation; the final demodulated signal enters the second operational amplifier Restore magnification. The beneficial effect of the present invention is that, compared with the existing fully differential amplifier circuit, the present invention realizes low noise, low offset voltage and high precision within the frequency band due to the adoption of capacitive common-mode feedback technology and chopping technology. The invention is particularly applicable to fully differential amplifiers.

Description

technical field [0001] The invention relates to integrated circuit technology, in particular to a high-precision full differential amplifier based on chopper technology, which uses common-mode feedback technology and chopper technology to reduce offset and noise. Background technique [0002] With the development of analog integrated circuit technology, high-speed and high-precision operational amplifiers are widely used. Fully differential operational amplifiers have great advantages over single-ended output operational amplifiers in terms of output swing and input dynamic range, and become a widely used circuit unit. However, the fully differential operational amplifier has the problem of unstable output common-mode level, and it is necessary to design a common-mode feedback circuit to ensure the normal operation of the operational amplifier. Common-mode feedback is often used in two ways: one way is to use a resistor to detect the output common-mode voltage, but this way...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F1/26
Inventor 周泽坤段茂平张晓敏石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com