FM detector with improved distortion and gain characteristics
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United States of America Patent
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Apr 7, 1987
Grant Date -
N/A
app pub date -
Oct 24, 1985
filing date -
Oct 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An FM detector includes a Hilbert transforming means and a pair of detector circuits which respectively detect an input FM signal and a Hilbert transform of the input FM signal produced by the Hilbert transforming circuit. Output signals of the two detector circuits are applied to a combining circuit, such as an adder circuit, to provide a detection output signal. With this construction, a second harmonic component which is inevitably produced during the detection operation is cancelled, so that a detector output signal, free of the so-called Aliasing distortion, is obtained even if an overlap between the baseband component and the second harmonic component occurs. Further, the gain characteristic of the detector is greatly improved.
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