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:
Jan. 29, 2002
Filed:
Oct. 24, 2000
Ryoichi Yamada, Yokosuka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a frequency synthesizer device in which a frequency-division ratio control circuit and other circuits are integrated on the same semiconductor substrate, a power supply for supplying a power to the frequency-division ratio control circuit is provided separately from a power supply for supplying a power to other circuits. A power supply voltage supplied from the power supply to the frequency-division ratio control circuit is set lower than a power supply voltage supplied to other circuits. The noise generated by the frequency-division ratio control circuit can be reduced by setting the power supply voltage lower, and also C/N degradation can be reduced. Since the noises can be suppressed even if the frequency is increased, a lock-up time can be reduced and the lower power consumption can be attained.