Bandpass filter with carrier frequency reduction

Details Bandpass filter with carrier frequency reduction Bandpass filter with carrier frequency reduction

2006-01-11

2009-06-30

Pan, Yuwen (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S256000, C455S264000

Reexamination Certificate

active

07555273

ABSTRACT:
A bandpass filtering method in which two frequency transpositions are performed in parallel on an input signal (SE) for filtering using respective first and second upstream mixing signals (SM1, SM2). A common oscillator (LO) is used which is coupled with a first phase shifter (MTM) to produce upstream mixing signals and which is coupled with a second phase shifter (MTV) to produce downstream mixing signals. Phase shifters are used in opposite manner on first and second signals so that each of said first and second signals (VT1, VT2) receives the phase-advanced output signal from one of the two phase shifters and the phase-delayed output signal from the other of the two phase shifters.

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International Search Report for PCT/FR00/01448: English translation attached, 6 pp., Dec. 7, 2000.

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