Phase detector and timing extracting circuit using phase detecto

Details Phase detector and timing extracting circuit using phase detecto Phase detector and timing extracting circuit using phase detecto

1998-03-16

2000-05-16

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 24, 327 27, 327197, H03D 1300

Patent

active

06064236&

ABSTRACT:
Disclosed are a phase detector for detecting the phase difference between a data signal and a clock signal, and a timing extracting circuit for controlling the phase of the clock signal so that the phase relationship between the clock signal and the data signal is optimal by using the phase detector. The phase detector includes an edge detector for generating an edge signal at the rising edge and the falling edge of the data signal, and a D flip flop (D-FF) for storing and outputting the logical value of the clock signal at the time of generation of the edge signal, and holding the logical value until the generation of the next edge signal, thereby outputting a signal corresponding to the phase difference between the data signal and the clock signal. A clock generator in the timing extracting circuit having a PLL structure controls the phase of the clock signal so that the difference becomes optimal.

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patent: 5455540 (1995-10-01), Williams
patent: 5793680 (1998-08-01), Okajima

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