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:
Feb. 13, 2007
Filed:
Jul. 30, 2004
Takahiro Nakamura, Tokyo, JP;
Kenichi Ohhata, Kagoshima, JP;
Toru Masuda, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A frequency generator which can perform stable frequency oscillation unaffected by temperature variation. A frequency generator having a differential amplifier () having an LC resonance circuit () as a load and buffer circuits () feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter () converting an output voltage of a reference voltage generator () and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF. An oscillation frequency stable to temperature variation can be obtained.