FPLL having AFC filter with limited phase shift

Details FPLL having AFC filter with limited phase shift FPLL having AFC filter with limited phase shift

1995-01-27

1997-06-10

Peng, John K.

Television

Receiver circuitry

Automatic frequency control

348727, 331 34, 4551922, 375326, 375344, 375374, 375375, H04N 550, H04N 5455

Patent

active

056381409

ABSTRACT:
An AFC filter for an FPLL comprises a filter formed of a network of resistors and capacitors exhibiting a predetermined phase response characteristic. The phase response characteristic is limited with increasing frequency to a value of about 90.degree. during a start-up interval.

REFERENCES:
patent: 4823399 (1989-04-01), George
patent: 4945415 (1990-07-01), McGinn

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