Frequency detector of phase locked loop

Details Frequency detector of phase locked loop Frequency detector of phase locked loop

1997-10-31

1999-03-30

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 49, H03K 906

Patent

active

058894187

ABSTRACT:
A frequency detector in a phase locked loop which generates a clock signal for reproducing a signal from a optical disc. 3 T information corresponding to an upper limit of the frequency of the Eight-to-Fourteen Modulation signal is compared with the oscillation clock of the VCO divided by three to reduce the oscillation frequency of the VCO. Additionally, 11 T information corresponding to a lower limit of the frequency of the Eight-to-Fourteen Modulation signal is compared with the oscillation clock of the VCO divided by eleven to increase the oscillation frequency of the VCO thereby providing a VCO which oscillates at a frequency corresponding to the frequency of the Eight-to-Fourteen Modulation signal.

REFERENCES:
patent: 4628282 (1986-12-01), Hikawa et al.
patent: 5012492 (1991-04-01), Sexton et al.
patent: 5302916 (1994-04-01), Pritchett
patent: 5337335 (1994-08-01), Cloetens et al.
patent: 5631582 (1997-05-01), Fujikawa

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