Synchronization detection circuit, pulse width modulation...

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

Reexamination Certificate

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Details

C327S145000

Reexamination Certificate

active

07924071

ABSTRACT:
Provided is a synchronization detection circuit including: a multiphase clock generation circuit which includes a phase locked loop circuit that generates multiphase clock signals having a plurality of different phases, based on a reference clock signal, and which generates high-speed multiphase clock signals having a frequency obtained by multiplying a frequency of the reference clock signal, and low-speed multiphase clock signals having a frequency obtained by dividing a frequency of the high-speed multiphase clock signal; and a synchronous clock specifying circuit that specifies a clock signal synchronized with a synchronous signal from among the multiphase clock signals, and generates a synchronous position signal indicating a synchronous position of the synchronous signal, based on a comparison result between the synchronous signal and the high-speed multiphase clock signals and a comparison result between the synchronous signal and representative clock signals selected from the low-speed multiphase clock signals.

REFERENCES:
patent: 6737896 (2004-05-01), Yoshioka
patent: 7088155 (2006-08-01), Takahashi
patent: 7554373 (2009-06-01), Fujino et al.
patent: 7683690 (2010-03-01), Hiraku
patent: 2008/0055697 (2008-03-01), Okazaki
patent: 2006-20109 (2006-01-01), None
patent: 2008-55750 (2008-03-01), None

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