Method and apparatus for supplying synchronization signals secur

Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled

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331 1A, 331 49, 331 57, 327150, 375376, H03L 707

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active

058349804

ABSTRACT:
A method and apparatus for recovering the time base of signals which change at periodic intervals is disclosed. The apparatus comprises gated voltage controlled oscillators (GVCO) that are alternated or exchanged, to reduce phase and frequency deviations in the recovered time base signal, such as the deviations induced by inherent GVCO differences. Each GVCO is stabilized by a respective phase locked loop. The respective GVCOs are gated only in response to a chosen polarity transition in the input signal, to make the circuit more tolerant of waveform distortions. More than two GVCOs may be used to provide improved frequency drift resistance. The circuit uses resynchronization control signals, such as the time slot signal in synchronous switching systems, to indicate resynchronization or reassignment of the GVCOs in gaps in the data transmission. Automatic reassignment is insured when there are periods of non-transitioning data that last longer than the stability of the GVCOs to prevent frequency drift in the recovered clock.

REFERENCES:
patent: 5289138 (1994-02-01), Wang
patent: 5373254 (1994-12-01), Nakauchi et al.
patent: 5463351 (1995-10-01), Marko et al.
patent: 5608357 (1997-03-01), Ta et al.
patent: 5610558 (1997-03-01), Mittel et al.

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