Class AB amplifier for sampling and controlling background noise based on operational amplifiers

An operational amplifier and amplifier technology, applied in amplifiers, improving amplifiers to reduce noise effects, electrical components, etc., can solve problems such as reducing product competitiveness and increasing cost, and achieve the effect of reducing noise floor and eliminating positive feedback

Pending Publication Date: 2019-02-15
上海海栎创科技股份有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will increase the cost and reduce the competitiveness of the product.

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
  • Class AB amplifier for sampling and controlling background noise based on operational amplifiers
  • Class AB amplifier for sampling and controlling background noise based on operational amplifiers
  • Class AB amplifier for sampling and controlling background noise based on operational amplifiers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0036] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

[0037] In the MOS...

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 class AB amplifier for sampling and controlling background noise based on operational amplifiers. The class AB amplifier comprises the structure that the output end of a first current sampling circuit is connected with the negative input end of a first operational amplifier, and the input end of the first current sampling circuit is connected with the source of a first P-type bias MOS tube; the output end of a second current sampling circuit is connected with the positive input end of the first operational amplifier, and the input end of the second current sampling circuit is connected with the drain of a P-type voltage-limiting MOS tube; the output end of the first operational amplifier is connected with the grid of the P-type voltage-limiting MOS tube; the output end of a third current sampling circuit is connected with the negative input end of a second operational amplifier, and the input end of the third current sampling circuit is connected with the drain of an N-type voltage-limiting MOS tube; the output end of a fourth current sampling circuit is connected with the positive input end of the second operational amplifier, and the input end of the fourth current sampling circuit is connected with the source of a first N-type bias MOS tube; and the output end of the second operational amplifier is connected with the grid of the N-type voltage-limiting MOS tube. According to the scheme of the invention, the background noise of the class AB amplifier can be reduced without eliminating the positive feedback by additionally using a high-voltage MOSdevice or a specially-developed MOS device for reducing the substrate current.

Description

technical field [0001] The invention relates to the field of class AB amplifiers, in particular to a class AB amplifier based on operational amplifier sampling to control floor noise. Background technique [0002] The Class A amplifier conducts 100% of the time, so a higher linearity can be obtained, but the static bias current of the Class A amplifier is relatively large. In the center of the load point, when there is no signal or only intermittent signal, there will be a considerable power loss, so the efficiency is lower. Compared with Class A amplifiers, Class B amplifiers have a complementary output structure. The two transistors cannot work at the same time, and the static bias current is basically 0, so the efficiency is higher. At the same time, because each device works for half a cycle, the on-time Only 50%, there is a large crossover distortion, which seriously affects the performance of the amplifier. [0003] The output device of the class AB amplifier works f...

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 Applications(China)
IPC IPC(8): H03F1/26
CPCH03F1/26H03F2200/372
Inventor 秦鹏举卢昌鹏
Owner 上海海栎创科技股份有限公司
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