Edge detector

Details Edge detector Edge detector

1994-06-17

1996-01-23

Chin, Stephen

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

376373, A04L 700

Patent

active

054870950

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: 4677648 (1987-06-01), Zurfluh
patent: 4841551 (1989-06-01), Avaneas
patent: 4984249 (1991-01-01), Long et al.
patent: 5003561 (1991-03-01), Dragotin
patent: 5022056 (1991-06-01), Henderson et al.
patent: 5022057 (1991-06-01), Nishi et al.
patent: 5095498 (1992-03-01), DeLuca et al.
patent: 5313501 (1994-05-01), Thacker

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