Phase-locked loop circuit having ring oscillator

Details Phase-locked loop circuit having ring oscillator Phase-locked loop circuit having ring oscillator

1994-05-24

1996-02-06

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

331 34, 331 57, 331187, 327159, H03D 324

Patent

active

054901820

ABSTRACT:
A phase-locked loop circuit has a ring oscillator comprising a plurality of 1st, 2nd, . . . , nth inverter chains composed of series-connected 21, 22, . . . , 2n inverters (n.gtoreq.2), respectively, an (n+1)th inverter chain composed of an odd number of series-connected inverters, and a plurality of 1st-nth selectors associated with the 1st-nth inverter chains, respectively, for selectively outputting input signals to and output signals from the 1st-nth inverter chains, the 1st-nth inverter chains being combined respectively with the 1st-nth selectors in respective combinations, the combinations and the (n+1)th inverter chain being connected in a ring configuration. A phase comparator compares an input clock signal and an oscillated clock signal from the ring oscillator in phase, and applies an output signal to a control circuit which controls the 1st-nth selectors to synchronize the oscillated clock signal with the input clock signal.

REFERENCES:
patent: 5331294 (1994-07-01), Watanabe et al.
patent: 5349311 (1994-09-01), Mentzer

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