Phase-locked loop demodulator having loop filter controlled by l

Details Phase-locked loop demodulator having loop filter controlled by l Phase-locked loop demodulator having loop filter controlled by l

1992-03-05

1993-04-20

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329307, 329346, 331DIG2, 375 81, 455260, H03D 300, H03L 7093

Patent

active

052046346

ABSTRACT:
A phase-locked loop demodulator comprises a mixer and a loop filter between an input and an output. A voltage-controlled oscillator is connected between its output and an input of the mixer. The demodulator further comprises a lock-on detector circuit whose output signal is adapted to increase the static loop gain after lock-on by modifying the characteristics of the filter.

REFERENCES:
patent: 3983501 (1976-09-01), Lindstrom
patent: 4575684 (1986-03-01), Stamm
patent: 4937536 (1990-06-01), Reinhardt et al.
patent: 5072192 (1991-12-01), Noguera et al.
Patent Abstracts of Japan, vol. 010, No. 150 (E403) May 31, 1986 & JP-A-61 009 021 (Sony KK) Jan. 16, 1986.
Patent Abstracts of Japan, vol. 7, No. 182 (E-192) (1327) Aug. 11, 1983 & JP-A-58 186 010 (Mitsubishi Denki K.K.), May 25, 1983.
Patent Abstracts of Japan, vol. 005, No. 133 (E-071) Aug. 25, 1981 & JP-A-56 069 934 (Pioneer Electronic Corp) Jun. 11, 1981.

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