Charge pump circuit

Details Charge pump circuit Charge pump circuit

2008-01-29

2008-01-29

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S157000

Reexamination Certificate

active

07323914

ABSTRACT:
Adverse effects of switching noise produced by a charge pump circuit on a displayed image are prevented. In a synchronizing separation circuit18,a synchronizing signal is separated from a video signal. The separated synchronizing signal is subjected to ½ frequency division in a flip-flop20to obtain a clock signal having a period which is two times as much as one horizontal period, and this clock signal is utilized to control switching of the charge pump circuit. As a result, a timing at which each switch in the charge pump is changed over can be set in a period close to a horizontal synchronizing signal without a video signal, thereby preventing noise from affecting the video signal.

REFERENCES:
patent: 4802739 (1989-02-01), Iwamoto
patent: 5574407 (1996-11-01), Sauer et al.
patent: 5699018 (1997-12-01), Yamamoto et al.
patent: 5895328 (1999-04-01), Pahio
patent: 5982836 (1999-11-01), Sakae et al.
patent: 6021056 (2000-02-01), Forbes et al.
patent: 6140881 (2000-10-01), Kim
patent: 6876185 (2005-04-01), Niratsuka
patent: 7009857 (2006-03-01), Chen et al.
patent: 2003/0085742 (2003-05-01), Jain
patent: 2003/0201805 (2003-10-01), Holland et al.
patent: 2005/0104651 (2005-05-01), Hashimoto
patent: 7-298607 (1995-11-01), None
English Patent Abstract of JP7298607 from esp@cenet, published Nov. 10, 1995, 1 page.

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