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

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 problems such as noise (large flicker noise, overall performance limitations of amplifiers, etc.), achieve high gain, ensure stability, and increase gain Effect

Active Publication Date: 2016-10-12
BOE TECH GRP CO LTD
View PDF11 Cites 6 Cited by
  • 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

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
  • Two-stage operational amplifier
  • Two-stage operational amplifier
  • Two-stage operational amplifier

Examples

Experimental program
Comparison scheme
Effect test

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...

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 discloses a two-stage operational amplifier, comprising a bias voltage generation unit, a first-stage operational amplifier unit and a second-stage operational amplifier unit. The first-stage operational amplifier unit comprises a foldable cascode amplifier circuit and a cross coupling load. The cross coupling load is connected with a load differential pair in the foldable cascode amplifier circuit. The cross coupling load comprises two transistors. The two transistors in the cross coupling load and the two transistors in the corresponding load differential pair form two current mirror structures. The two current mirror structures are crossly coupled. According to the technical scheme of the amplifier, through addition of the cross coupling load to the load differential pair in the foldable cascode amplifier circuit, the gain of the two-stage operational amplifier is increased through adoption of a positive feedback negative conductance gain enhancement technology; and moreover, through reasonable setting of the parameters of the mos transistors in the foldable cascode amplifier circuit, the noises of the two-stage operational amplifier can be reduced.

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

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): H03F1/14H03F1/26H03F3/45
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
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