Phase alignment methods and apparatus

Details Phase alignment methods and apparatus Phase alignment methods and apparatus

1993-04-08

1995-07-11

Dolinar, Andrew M.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 27, 327156, 327236, H03K 5135, H03L 7087

Patent

active

054324807

ABSTRACT:
In methods and apparatus for controlling a phase relationship of two signals, a supplementary phase adjustment signal is generated. The supplementary phase adjustment signal has a zero value when an actual phase relationship of the two signals deviates from a desired phase relationship by less than a threshold phase deviation, and has a non-zero value when the actual phase relationship deviates from the desired phase relationship by more than the threshold phase deviation. The phase relationship of the two signals is adjusted in response to a sum of the supplementary phase adjustment signal and a phase adjustment signal which is proportional to the deviation of the actual phase relationship from the desired phase relationship. The methods and apparatus are particularly applicable to alignment of clock signals with data signals.

REFERENCES:
patent: 3495184 (1970-02-01), Perkins, Jr. et al.
patent: 4605908 (1986-08-01), Broughton
patent: 5068628 (1991-11-01), Ghoshal
patent: 5235290 (1993-08-01), Bar-David
Patent Abstracts of Japan: Patent No. A56051128 issued on May 8, 1981. Inventor: Yokoya Satoshi. Patentee: Sony Corp.
"Frequency Comparator Performs Double Duty", R. C. E. Thomas, Electrical Design News, vol. 15, No. 21, Nov. 1, 1990, pp. 29-32.

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