Phase locked loop FM demodulator with variable bandwidth loop fi

Details Phase locked loop FM demodulator with variable bandwidth loop fi Phase locked loop FM demodulator with variable bandwidth loop fi

1981-12-03

1984-10-23

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 331 17, 331 23, 455266, H03D 300, H03L 708

Patent

active

044790910

ABSTRACT:
In an FM demodulation circuit which demodulates an FM signal by the use of a phase-lock loop constructed of a phase comparator, a loop filter and a voltage-controlled oscillator, the loop filter is a variable loop filter whose loop band width is varied in correspondence with the modulation band width and the carrier
oise ratio of the input signal by a base band processing circuit.

REFERENCES:
patent: 3911232 (1975-10-01), Itoh
patent: 4009450 (1977-02-01), Holcomb et al.
patent: 4077015 (1978-02-01), Carson et al.
patent: 4121170 (1978-10-01), Hartmann et al.
patent: 4123718 (1978-10-01), Lampert et al.
patent: 4433308 (1984-02-01), Hirata

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