Patent ID: 6236847
Filing Date: 2001-05-22
Classification: H03D,H03H

Abstract:
A Receiver comprising:a frequency converter for deriving from an input signal of the receiver a plurality of intermediate polyphase signals,a polyphase filter for deriving filtered polyphase signals from the intermediate polyphase signals,a further frequency converter for deriving a plurality of further intermediate polyphase signals from the filtered polyphase signals, anda further polyphase filter for deriving further filtered polyphase signals from the further intermediate polyphase signals, one of the polyphase filter and the further polyphase filter being arranged for attenuating signals above a first frequency, and another of the polyphase filter and the further polyphase filter being arranged for attenuating signals below a second frequency, wherein said first frequency and said second frequency are substantially zero so that said polyphase filter, said further frequency converter and said further polyphase filter form a bandpass filter having a cut off frequency that does not depend on values of components of said polyphase filter and said further polyphase filter, and is determined by said local oscillating frequency of said further frequency converter.