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:
Jun. 28, 2005
Filed:
Mar. 29, 2001
Taizo Yamawaki, Tokyo, JP;
Satoshi Tanaka, Kokubunji, JP;
Norio Hayashi, Tamamuramachi, JP;
Kazuo Watanabe, Takasaki, JP;
Robert Astle Henshaw, Cambridge, GB;
Taizo Yamawaki, Tokyo, JP;
Satoshi Tanaka, Kokubunji, JP;
Norio Hayashi, Tamamuramachi, JP;
Kazuo Watanabe, Takasaki, JP;
Robert Astle Henshaw, Cambridge, GB;
Renesas Technology Corp., Toyko, JP;
TTP Com Limited, Royston Hertfordshire, GB;
Abstract
In a PLL circuit, and a wireless mobile station with that PLL circuit, an LPF charging constant current source, a discharging constant current source and a high-speed charging constant current source are connected to an output terminal of a phase comparator with current mode output. When a convergence frequency of the PLL circuit is low, an input voltage of a VCO is increased from OV so as to be converged by using the constant current source. However, when the convergence frequency of the PLL circuit is high, the input voltage of the PLL circuit is temporarily increased to the maximum voltage by using the constant current source. Thereafter, the input voltage is gradually dropped from the maximum voltage so as to be converged by using the constant current source.