公开(公告)号：EP1256167B1

公开(公告)日：2003-10-22

申请号：EP00993559.4

申请日：2000-12-19

申请人： Agilent Technologies, Inc. (a Delaware corporation)

发明人： HORNAK, Thomas

IPC分类号： H03H17/00

CPC分类号： H03H11/22

公开(公告)号：EP1256167A2

公开(公告)日：2002-11-13

申请号：EP00993559.4

申请日：2000-12-19

申请人： Agilent Technologies, Inc. (a Delaware corporation)

发明人： HORNAK, Thomas

IPC分类号： H03H17/00

CPC分类号： H03H11/22

摘要： A polyphase filter passes a desired frequency and attenuates an image frequency in many communication systems. The invention is an error correction circuit that compensates the polyphase filter for low open loop gain operational amplifiers. When multiple polyphase filters are used in communication circuits on a single integrated circuit (IC), the open loop gain of the operational amplifiers is limited by the IC's ability to dissipate power. The error correction circuit reduces the dependency of the polyphase filter performance on the low open loop gain of its operational amplifiers and hence, on temperature and IC process parameters.