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. 12, 2007
Filed:
Feb. 17, 2005
Masatake Irie, Takatsuki, JP;
Masatake Irie, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A frequency synthesizer includes a VCO (), measures an oscillation frequency of each of multiple bands with a predetermined voltage (V) applied to the VCO (), and stores the measurement result to a storage circuit (). The synthesizer compares a frequency division ratio from a PLL control circuit () with the measured oscillation frequency stored to the storage circuit, and selects one band from VCO () based on the comparison result. The synthesizer causes the VCO () to oscillate on the selected band with a fixed voltage, and determines a frequency band to be used for phase-locked operation in actual based on an error between the oscillation frequency and a reference frequency.