FM demodulation and frequency tuning for a phase-locked loop

Details FM demodulation and frequency tuning for a phase-locked loop FM demodulation and frequency tuning for a phase-locked loop

1997-05-22

1998-12-15

Grimm, Siegfried H.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

329326, 331 11, 331 14, 331 17, 331 25, 331 34, 455214, 455260, H03D 306, H03L 7099

Patent

active

058501649

ABSTRACT:
The invention provides a demodulation PLL wherein: the first position of a switch, which is controlled by a control circuit, respectively connects the outputs of a mixer and a LP filter to high gain and low gain inputs of an oscillator when frequency signals at the inputs of the mixer have not converged sufficiently, i.e. during the PLLs tuning mode; the second position of the switch respectively connects the outputs of the mixer and the LP filter to the low gain and high gain inputs of the oscillator when the frequency signals at the inputs of the mixer and the signal levels on the input and output of the filter have converged sufficiently, i.e. during the PLLs demodulation mode.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4479091 (1984-10-01), Yoshisato
patent: 4816770 (1989-03-01), Naumann
patent: 5272453 (1993-12-01), Traynor et al.
patent: 5335364 (1994-08-01), Heinonen
patent: 5446411 (1995-08-01), Horsfall et al.

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