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. 23, 2010
Filed:
Oct. 02, 2007
Yukinori Akamine, Kokubunji, JP;
Manabu Kawabe, Hachioji, JP;
Satoshi Tanaka, Kokubunji, JP;
Yasuo Shima, Ome, JP;
Ryoichi Takano, Takasaki, JP;
Yukinori Akamine, Kokubunji, JP;
Manabu Kawabe, Hachioji, JP;
Satoshi Tanaka, Kokubunji, JP;
Yasuo Shima, Ome, JP;
Ryoichi Takano, Takasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A PLL circuit equipped with a loop gain detecting circuit that can suppress the change of the loop gain. When detecting the loop gain, the frequency of the input signal to the second input (IN-) of the phase detector is first changed, and the response corresponding to the change is detected by the output of the voltage locked oscillator. The detection is performed by connecting the output of the voltage locked oscillator with the counter and connecting the output of the counter with the integrator. The phase locked loop characteristics are optimized by performing feedback for the detection result on the value of the charge pump current.