FM discriminator circuit

Details FM discriminator circuit FM discriminator circuit

1975-05-21

1976-06-01

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

307221C, 329103, H03K 906

Patent

active

039612759

ABSTRACT:
A bucket brigade device (BBD) circuit is used to delay the output of the limiter in an FM receiver for use in a coincidence-type FM demodulator to which the undelayed limiter output is also supplied. The BBD circuit is stepped forward by a fixed frequency oscillator of a frequency conversion stage additional to the tunable converter of the receiver and the amount of delay is determined by a frequency division operation as well as the BBD length. The fixed frequency oscillator can be used also for automatic fine tuning and an arrangement for disabling the BBD stepping provides a good form of muting or blanking. The circuits are integrable in monolithic form.

REFERENCES:
patent: 3778727 (1973-12-01), Williams

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