Method and apparatus for determining an instantaneous phase diff

Details Method and apparatus for determining an instantaneous phase diff Method and apparatus for determining an instantaneous phase diff

1995-09-05

1996-09-03

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 16, 331 18, 327 7, 327 9, 327105, 327156, 455260, H03L 7091, H03L 718

Patent

active

055527507

ABSTRACT:
A method and apparatus determine an instantaneous phase difference (207) between a reference signal (103) and a controlled signal (120). The reference signal (103) is derived by frequency dividing a first signal by a counter (106) including an output (107) having K sequential states, wherein K is an integer value equal to the frequency of the first signal (103) divided by the frequency of the desired reference signal, and wherein the output (107) changes by no more than one bit between any adjacent states of the K sequential states. The output (107) of the counter (106) is recorded (206) at a time concurrent with a first predetermined event occurring in the controlled signal (120), thereby generating a recorded count value that is free from metastability induced errors. The recorded count value is decoded (208) to produce a sequential state number S.sub.E corresponding to the first predetermined event. The instantaneous phase difference (207) is then calculated (210) from S.sub.E, K, and other predetermined constants.

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