Patent · US Active

High-current sensing scheme using drain-source voltage

US9671438B2 · kind B2 · utility

3Cited by

6References

25Claims

0Family size

Assignee

QUALCOMM Incorporated · US

Inventors

Chuang Zhang · Fort Collins, US
Zhengming Fu · San Diego, US
Nan Chen · San Diego, US

Key dates

Filing date	Nov 5, 2014
Grant date	Jun 6, 2017
Priority date	—
Expiry date	Jun 19, 2035

Classification

Technology area (CPC G)Physics
CPC primaryG01R19/32
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In one embodiment, a method for measuring current is described herein. The method comprises shorting first and second inputs of an amplifying circuit to generate a first output signal, and converting the first output signal into an offset cancelation value. The method also comprises passing a current through a power switch, wherein the current generates a voltage drop across the power switch, applying the voltage drop across the first and second inputs of the amplifying circuit to generate a second output signal, and converting the second output signal into a current value. The method further comprises subtracting the offset cancelation value from the current value to generate an offset-compensated current value.

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