Clock shaping device and electronic instrument using the same

Details Clock shaping device and electronic instrument using the same Clock shaping device and electronic instrument using the same

2006-06-06

2006-06-06

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S099000

Reexamination Certificate

active

07057430

ABSTRACT:
A clock shaping device includes a first clock signal selection portion that selects between a reception clock signal and a back-up clock signal based on a detected loss in the reception clock signal. A second clock signal selection portion selects between a clock signal received from the first clock signal selection portion and a clock signal received from a quartz crystal oscillation circuit based on a detected loss in the back-up clock signal. A voltage controlled oscillation circuit has a frequency that varies with a control voltage being supplied and outputs a feedback loop output signal. A phase comparison portion generates a phase difference signal based on a comparison between the feedback loop output signal and a clock signal outputted from the second clock signal selection portion. A loop filter smoothes the phase difference signal and outputs the phase difference signal in the form of the control voltage.

REFERENCES:
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patent: 4868524 (1989-09-01), Costlow et al.
patent: 5260979 (1993-11-01), Parker et al.
patent: 5477330 (1995-12-01), Dorr
patent: 5642069 (1997-06-01), Waite
patent: 5828243 (1998-10-01), Bagley
patent: 6362670 (2002-03-01), Beaulieu
patent: 6765424 (2004-07-01), Zampetti et al.
patent: 08-274633 (1996-10-01), None
patent: 09-307432 (1997-11-01), None
Patent Abstract of Japan regarding Publication No. 08-274633 published Oct. 18, 1996.
Patent Abstract of Japan regarding Publication No. 09-307432 published Nov. 28, 1996.

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