The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2009
Filed:
Dec. 28, 2005
Takeshi Ikeda, Tokyo, JP;
Hiroshi Miyagi, Kanagawa, JP;
Takeshi Ikeda, Tokyo, JP;
Hiroshi Miyagi, Kanagawa, JP;
Niigata Seimitsu Co., Ltd., Jyoetsu-shi, JP;
Abstract
There are included a signal generating circuit () that generates, based on a comparison signal outputted from a phase comparator () and a clock signal outputted from a crystal oscillation circuit () and having a shorter pulse width than the comparison signal, a control signal obtained from a logical product of the two signals; and a charge pump circuit that performs, based on the control signal from the signal generating circuit (), a charging or discharging operation of a capacitor. The charging or discharging operation of the capacitor is gradually performed little by little based on the control signal having the shorter pulse width than the conversional comparison signal, whereby even if the capacitance value of the capacitor is reduced, the substantial time constant can be enlarged, resulting in a stable operation of a frequency synthesizer.