A compensatory method and device for DC offset voltage of amplifier

A technology of DC offset and compensation method, applied in the direction of differential amplifier, DC-coupled DC amplifier, etc., can solve the problem that the offset voltage cannot be eliminated, and achieve the effect of simple structure and small circuit scale

Inactive Publication Date: 2008-07-09
APEXONE MICROELECTRONICS
View PDF2 Cites 58 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these techniques, the offset voltage of the final output stage caused by the asymmetry of the components in the signal path cannot be eliminated.

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
  • A compensatory method and device for DC offset voltage of amplifier
  • A compensatory method and device for DC offset voltage of amplifier
  • A compensatory method and device for DC offset voltage of amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The specific implementation manners according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The amplifier DC offset voltage compensation device according to the first embodiment of the present invention is shown in FIG. 1 . In FIG. 1 , 100 denotes an amplifier, here a fully differential amplifier, which consists of an adder unit 101 and other modules 102 . 200 represents an offset voltage compensation block (Offset cancellation block), which is composed of a comparator 201 (comparator), a register and decoder (registor&decoder) module 202, and a current compensation block 203 (current compensation block). If the output signal of the amplifier is not a pure analog signal, a low pass filter (not shown here) can be further inserted before the comparator 201 .

[0028] Because the DC offset voltage is constant with or without the input signal. Therefore, this method compensates the input offset voltage t...

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 provides a compensating method of the switching frequency of a amplifier which comprises the following steps: two output end polarities is compared in the state in which the amplifier has no signal outputting; the inputting end current of the amplifier is adjusted according to the electrode; repeated circle is carried out until achieving the requirement of stopping the cycle. The invention also provides a compensating device of the DC offset voltage of the amplifier which comprises a comparator, a register, a decoding module and a current compensation module. The invention has the advantages of simple structure, low cost, small power-consumption. Meanwhile, the invention is used both for a signal amplifier and an amplifier system, which can limit the imbalance voltage to be in small scope.

Description

technical field [0001] The invention relates to a method and a device for compensating the DC offset voltage of an amplifier. Background technique [0002] When there is no signal input to the operational amplifier, there is a certain voltage difference at the output terminal, which is called DC offset voltage (DCoffset). Due to the differences in the industrial production of integrated circuits, the existence of asymmetry and mismatch, the offset voltage inevitably exists. In an op amp with a certain gain, a small mismatch can result in a large offset voltage at the output stage. [0003] In the power amplifier chip, if the DC offset voltage is too large, on the one hand, it will cause a large static power consumption flowing through the load, which limits its application in portable products; on the other hand, the excessive offset voltage may also affect the chip’s Other properties lead to too low yield in the production process. [0004] Most of the existing technolog...

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): H03F3/45
Inventor 万幸
Owner APEXONE MICROELECTRONICS
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