Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1995-04-05
1997-01-21
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
455214, 455337, H03D 306
Patent
active
055962980
ABSTRACT:
In a quadrature FM detector, demodulation is performed by a product detector which multiplies an amplitude limited FM modulated information signal by a version of the amplitude limited FM modulated information signal which has been phase shifted by a phase shifting network including a single tuned LC circuit. In order to assure that the LC circuit is tuned to the carrier frequency of the FM signal, the LC circuit is tuned by a variable impedance device in response to a control signal generated by a bus controlled DAC. The control signal is coupled to the variable impedance device at the same pin of an integrated circuit where the LC circuit is coupled to the demodulator.
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Applications Note AN-382 From National Semiconductor Linear Applications Handbook, 1986, pp. 973-985 No month.
LM-1211 Data Sheet From National Semiconductor Special Purposes Linear Devices DataBook, 1989 pp. 2-8 to 2-17 No month.
Hutchinson Daniel M.
Miller Rick W.
Emanuel Peter M.
Grimm Siegfried H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
Wein Frederick A.
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