Multiple bandwidth FM demodulator
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United States of America Patent
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Apr 3, 1984
Grant Date -
N/A
app pub date -
Oct 13, 1981
filing date -
Oct 13, 1981
priority date (Note) -
Expired
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Abstract
A multiple bandwidth quadrature type FM demodulator employs a double-balanced mixer supplied with a frequency modulated IF signal directly and through one of a selectable plurality of bandpass circuits each having a different bandwidth, having a linear phase shift versus frequency characteristic and producing a 90.degree. phase shift at the IF frequency whereby to produce at the output of the mixer a signal level that varies as a linear function of frequency of the input signal, the demodulator including a bias control circuit for the mixer to establish a normalized output for all filters at full bandwidth modulation and further including circuits for establishing a signal balanced with respect to ground or other reference potential regardless of the filter employed.
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