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:
Mar. 30, 2010
Filed:
Mar. 30, 2007
Yasuyuki Kimura, Maebashi, JP;
Satoshi Shimizu, Maebashi, JP;
Masakatsu Yokota, Takasaki, JP;
Ken Suyama, Mamaroneck, NY (US);
Aleksander Dec, Tarrytown, NY (US);
Yasuyuki Kimura, Maebashi, JP;
Satoshi Shimizu, Maebashi, JP;
Masakatsu Yokota, Takasaki, JP;
Ken Suyama, Mamaroneck, NY (US);
Aleksander Dec, Tarrytown, NY (US);
Renesas Technology Corp., Tokyo, JP;
Epoch Microelectronics, Inc., Hawthorne, NY (US);
Abstract
A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.