Frequency search system for a phase locked loop

Details Frequency search system for a phase locked loop Frequency search system for a phase locked loop

1981-09-21

1984-04-17

Miller, Stanley D.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

331 4, 331 14, 331 17, 331 20, 358 25, 455260, H03D 318, H03L 700

Patent

active

044437692

ABSTRACT:
A sampling PLL circuit features a frequency sweep caused by an offset voltage applied to an integrator to avoid false lock ups. At one end of the frequency range the polarity of the offset signal can be reversed. The error voltage can be sampled during a television vertical or horizontal blanking period. Once proper lock up is achieved, the offset signal can be removed.

REFERENCES:
patent: 3775695 (1973-11-01), Hill
patent: 4115745 (1978-09-01), Egan
patent: 4117420 (1978-09-01), DeConinck et al.
patent: 4146843 (1979-03-01), Isobe
patent: 4222074 (1980-09-01), Breithaupt
patent: 4291336 (1981-09-01), Shanley
Anon, "Linear Integrated Circuits Data Book", Fairchild Semiconductor, 1976, pp. 9-26 and 9-37.
Hermsdorfer, O., "TV Demodulator AMF2 Now Combines Envelope and Synchronous Detection", News from Rodhe & Schwarz 77, vol. 17, pp. 9-13, 1977.

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