Patent · US Active

Capacitive-coupled chopper instrumentation amplifiers and associated methods

US10797661B2 · kind B2 · utility

0Cited by

5References

20Claims

0Family size

Assignee

Maxim Integrated Products, Inc. · US

Inventors

YUAN-XI CHEN · Shanghai, CN
Daihong Fu · Shanghai, CN
Jun Wu · Shanghai, CN

Key dates

Filing date	Oct 25, 2018
Grant date	Oct 6, 2020
Priority date	—
Expiry date	Oct 25, 2038

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2200/459
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A capacitive-coupled chopper instrumentation amplifier includes a first chopper, a first gain stage, a capacitive isolation stage electrically coupled between inputs of the first gain stage and the first chopper, a second gain stage, a second chopper electrically coupled between outputs of the first gain stage and inputs of the second gain stage, clamping circuitry electrically coupled between the inputs of the first gain stage and a reference voltage rail, and a controller. The controller is configured to (a) detect a change in a first common-mode voltage exceeding a threshold value, the first common-mode voltage being a common-mode voltage at the inputs of the amplifier, and (b) in response to detecting the change in the first common-mode voltage exceeding the threshold value, cause the clamping circuitry to clamp the inputs of the first gain stage to the reference voltage rail.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.