Linearized FM quadrature detector
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United States of America Patent
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-
Mar 1, 1983
Grant Date -
N/A
app pub date -
Feb 2, 1981
filing date -
Feb 2, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an FM receiver a multiplier is driven from the IF limiter. The limiter also drives a single tuned circuit which produces a quadrature signal that drives a second port in the multiplier. When the quadrature signal is multiplied by the IF signal an FM detector results. The center frequency is determined by the frequency of the quadrature relationship and the extent of the resultant output curve is determined by the Q of the tuned circuit. The output response is linearized by varying the current in the multiplier as a function of the IF signal deviation.
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