Patent · US Expired

Amplifier circuit with offset compensation, in particular for digital modulation devices

US6710645B2 · kind B2 · utility

16Cited by

4References

9Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Martin Isken · Neu-Ulm, DE
Josef Schmal · Hersbruck, DE
Bernd Memmler · Riemerling, DE
Gunther Trankle · Berlin, DE

Key dates

Filing date	May 11, 2001
Grant date	Mar 23, 2004
Priority date	—
Expiry date	May 11, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2203/45696
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An offset voltage at an output of a differential amplifier is compensated for by a control circuit having a digital setting device. The control circuit has a control device which is controlled by an offset voltage of the differential amplifier and which feeds an offset compensation signal into the differential amplifier. Compared with analog compensation with an external storage capacitor, temporal drift effects do not distort the offset compensation on the differential amplifier. The described principle can be applied, for example, in radio frequency receiver circuits.

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