Bus aligned quadrature FM detector
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United States of America Patent
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Jan 21, 1997
Grant Date -
N/A
app pub date -
Apr 5, 1995
filing date -
Apr 5, 1995
priority date (Note) -
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status (Latency Note)
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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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