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:
Oct. 05, 2010
Filed:
Mar. 29, 2007
Kazuaki Sogawa, Osaka, JP;
Masayoshi Kinoshita, Osaka, JP;
Yuji Yamada, Osaka, JP;
Junji Nakatsuka, Osaka, JP;
Kazuaki Sogawa, Osaka, JP;
Masayoshi Kinoshita, Osaka, JP;
Yuji Yamada, Osaka, JP;
Junji Nakatsuka, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a PLL circuit, a voltage controlled oscillatorhas two voltage-current conversion circuitsandand a selection circuitfor selecting an output of either one of the voltage-current conversion circuitsand. The output of the voltage-current conversion circuit selected by the selection circuitis inputted to a current controlled oscillator. The one voltage-current conversion circuithas an input thereof connected to an output of a loop filter, while the other voltage-current conversion circuithas an input thereof connected to an input terminalfor evaluating the oscillation characteristics of the voltage controlled oscillator. As a result, time-varying fluctuations in the voltage of the loop filter resulting from a structure in which the input terminal for evaluating the oscillation characteristics of the voltage controlled oscillator is connected to the loop filter via a switch and time-varying fluctuations in the output frequency of the PLL circuit are effectively suppressed.