FM detector with improved distortion and gain characteristics

Details FM detector with improved distortion and gain characteristics FM detector with improved distortion and gain characteristics

1985-10-24

1987-04-07

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329126, 329133, 329145, 375 80, 455214, H03D 304, H03D 306

Patent

active

046564322

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.

REFERENCES:
patent: 3991377 (1976-11-01), Salazar et al.
patent: 4506228 (1985-03-01), Kammeyer

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