Edge detector

Details Edge detector Edge detector

1995-05-26

1996-11-19

Chin, Wellington

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375373, H04L 700

Patent

active

055770789

ABSTRACT:
An edge detector has a digital phase locking loop in which one of the signals (e.g., the data signal) is coupled to a delay chain that develops a series of incrementally phase delayed versions of the input. Adjacent phase delayed pairs are selected, one pair at a time, and are compared to the other signal (e.g., the clock signal) to determine if an edge of the clock falls between the edges of the data signal in the selected phase pair, or falls outside the edges of the selected phase pair, on one side or the other thereof. If the clock edge falls outside the selected pair, a control signal selects another pair for comparison and the process is repeated until, for example, the data edges are aligned with the positive going edge of the clock. With a clock frequency equal to twice data frequency, the data can then be sampled on the falling edge of the clock.

REFERENCES:
patent: 4977582 (1990-12-01), Nichols
patent: 5313501 (1994-05-01), Thacker

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