FM demodulator using a switched capacitor phase shifter

Details FM demodulator using a switched capacitor phase shifter FM demodulator using a switched capacitor phase shifter

1996-12-10

1998-05-12

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329336, 455214, 455337, H03D 306

Patent

active

057511888

ABSTRACT:
In order to process an input signal exhibiting a frequency modulation about an intermediate frequency, the demodulator includes a first mixer for producing a first signal exhibiting the frequency modulation about a transposition frequency lower than the intermediate frequency; a switched-capacitor phase-shifter receiving the first signal so as to produce a second signal exhibiting, with respect to the first signal, a phase-shift varying substantially linearly with frequency about the transposition frequency; two substantially identical low-pass filters receiving the second signal and the first signal respectively; and a second mixer for mixing the signals produced by the first and second low-pass filters, in order to deliver a baseband output signal.

REFERENCES:
patent: 4455539 (1984-06-01), Wurzberg
patent: 4616186 (1986-10-01), Jansen
patent: 4975653 (1990-12-01), Kennedy et al.
--Patent Abstracts of Japan--vol. 009, No. 089, Apr. 1985 -59-219005 Dec. 10, 1984.

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