Digital loop filter and digital PLL circuit using the same

Details Digital loop filter and digital PLL circuit using the same Digital loop filter and digital PLL circuit using the same

1993-03-03

1995-09-12

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375371, 331 1R, 327159, H03D 324

Patent

active

054504520

ABSTRACT:
A digital loop filter includes a first loop filter for generating first phase control information at variable time intervals on the basis of phase error information indicating a phase difference between a first signal and a second signal. A second loop filter detects a frequency deviation between the first and second signals from the phase error information and generates second phase control information with a period inversely proportional to the frequency deviation. An adder generates finalized phase control information obtained by adding the first phase control information and the second phase control information to each other.

REFERENCES:
patent: 4780759 (1988-10-01), Matsushima et al.
patent: 4888564 (1989-12-01), Ishigaki
patent: 4920474 (1990-11-01), Kennedy et al.

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