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. 09, 1999
Filed:
Feb. 24, 1997
Atsushi Matsuda, Kawasaki, JP;
Yuji Segawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An oscillation circuit for producing an output whose frequency accords with an input voltage value, comprises a first constant current source whose current has a value according to the input voltage value; a charge capacitor to be charged by the first constant current source; a comparator having one input terminal connected to a charge terminal of the charge capacitor to be charged and an other input terminal supplied with a first reference voltage, for comparing inputs to both input terminals with each other and outputting an output signal having a high level or a low level; and first switch means for pulling down a potential of the charge terminal of the charge capacitor to a second reference voltage lower than the first reference voltage under control by an output of the comparator.