FM Demodulator
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United States of America Patent
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-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Feb 4, 1982
filing date -
Feb 20, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An FM demodulator in which an incoming FM signal (2a sin(.omega.+.delta..omega.)t) is demodulated to baseband (.delta..omega.) by applying it to first and second mixers (12, 14). The output (b sin .omega. t) of a local oscillator (16) is applied to one (14) of the mixers and is also applied to the other (12) of the mixers via a 90.degree. phase shifter (18). The phase of the output of one of the mixers is shifted so as to be in phase or in antiphase to the other and is applied together with the output of the other of the mixers to a signal divider (22), the output of which comprises the baseband signal which is substantially independent of fading.
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