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. 08, 2005
Filed:
Mar. 01, 2002
Koju Aoki, Kasugai, JP;
Hiroyuki Sakima, Kasugai, JP;
Koju Aoki, Kasugai, JP;
Hiroyuki Sakima, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method of switching the mode of a PLL circuit which has a high-speed mode and a normal mode, which allows the PLL circuit to be locked up at a high speed. The PLL circuit includes a phase comparator and a charge pump for generating a current depending on a comparison output signal from the phase comparator. The mode switching method includes the steps of detecting whether a current output terminal of the charge pump is in a high impedance state, and switching the mode of the PLL circuit from the high-speed mode to the normal mode or from the normal mode to the high-speed mode when the high impedance state is detected.