Patent · US Expired

Active filter circuit with operational amplifier

US6680645B2 · kind B2 · utility

6Cited by

4References

2Claims

0Family size

Assignee

Micronas GmbH · DE

Inventors

Norbert Greitschus · Balingen, DE
Stefan Noe · Stuttgart, DE

Key dates

Filing date	Oct 15, 2001
Grant date	Jan 20, 2004
Priority date	—
Expiry date	Oct 15, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH03H11/1278
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An at least second-order active filter circuit includes an operational amplifier (Op) whose frequency response, in conjunction with an RC network (R1, R2, C1, C2), serves to set a predetermined low-pass characteristic. The frequency response of the operational amplifier (Op) forms an integral part of this low-pass characteristic.

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