Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

1997-02-28

1999-11-23

Pham, Chi H.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375371, 375327, H03D 324

Patent

active

059913509

ABSTRACT:
A PLL circuit includes a phase comparator, a processor and a VCO. The phase comparator compares the phase of an output signal to that of a source signal to produce M-bit phase difference data. The processor processes the M-bit phase difference data to produce N-bit phase difference data by reducing a quantization error included in the M-bit phase difference data in a synchronous and steady state based on a difference between the M-bit phase difference data and previous M-bit phase difference data which was received from the phase coarator at a previous sampling instant. The oscillator generates the output signal based on the N-bit phase difference data.

REFERENCES:
patent: 5446767 (1995-08-01), Nakagawa et al.
patent: 5477177 (1995-12-01), Wong et al.
patent: 5486792 (1996-01-01), Girardeau, Jr.
patent: 5638010 (1997-06-01), Adams
patent: 5701602 (1997-12-01), Shidoma
patent: 5727038 (1998-03-01), May et al.

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