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:
Dec. 18, 2007
Filed:
Sep. 30, 2005
Satoru Doi, Ota, JP;
Satoru Doi, Ota, JP;
Sanyo Electric Col, Ltd., Osaka, JP;
Abstract
An oscillation frequency control circuit comprises a frequency counter that counts to measure a frequency of an oscillating signal outputted from an oscillation circuit which produces the oscillating signal of the frequency corresponding to analog control voltages inputted, a plurality of D/A converters that produce the analog control voltages respectively corresponding to digital values inputted, a digital value generator that generates the digital values according to control signals inputted, and an operation circuit that compares the frequency measured by the frequency counter with a reference frequency and produces the control signals, which are inputted to the digital value generator, corresponding to the comparing result.