FM demodulators

Details FM demodulators FM demodulators

1986-08-20

1988-05-24

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329116, 329131, 455232, H03D 300

Patent

active

047468734

ABSTRACT:
Apparatus for obtaining programmable threshold extension of an FM demodulator comprises a limiter preamplifier 4 and a variable gain buffer amplifier 6. The buffer amplifier 6 is provided with an external control node 16 such that the signal level fed from the buffer amplifier 6 to an injection locked oscillator/divider 8 can be programmed in dependence upon a control signal applied to the external control node 16. In this manner threshold extension of the FM demodulator can be selectively applied in dependence upon the noise level in an FM input signal to be demodulated. The limiter preamplifier 4 and the buffer amplifier 6 may form part of an automatic gain control circuit.

REFERENCES:
patent: 4608539 (1986-08-01), Lawton

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