Method and circuit for converting frequency-modulated signals through at least one intermediate frequency into low frequency signals
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United States of America Patent
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Dec 5, 1989
Grant Date -
N/A
app pub date -
Oct 23, 1987
filing date -
Feb 24, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mixer mixes received frequency modulated signals with a frequency provided by a voltage controlled oscillator to generate intermediate frequency signals. The intermediate frequency signals are filtered by a filter and input to a demodulator to generate low frequency signals. A control voltage is derived from the demodulator to control the resonant frequency of the filter in response to the frequency shift of the intermediate frequency signals. A phase rotator is coupled between the demodulator and the oscillator to phase rotate the control voltage of the oscillator. In a preferred embodiment, the phase rotator is an inverter.
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