Patent ID: 7079823
Filing Date: 2006-07-18
Classification: H03D,H03H

Abstract:
1. A bandpass filtering method for a bandpass filter comprising: performing two frequency transpositions in parallel on an input signal (SE) for filtering using respective first and second upstream mixing signals (SM filtering the two transposed signals respectively by two lowpass filters (F performing respective frequency transpositions on first and second filtered transposed signals (STF taking a sum or a difference of the first and second filtered transposed signals (STF selecting the frequency of the downstream mixing signals (SMV wherein a common oscillator (LO) is used which is coupled with a first phase shifter (MTM) to produce the upstream mixing signals and which is coupled with a second phase shifter (MTV) to produce the downstream mixing signals, and the phase shifters are used in opposite manner on first and second signal branches (VT