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:
Oct. 04, 1983
Filed:
Nov. 26, 1980
Applicant:
Inventor:
Mitsuo Higuchi, Tokyo, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
331 57 ; 307602 ; 307605 ; 331111 ;
Abstract
An oscillation circuit for providing an oscillation output having a duty ratio different from 50%. The oscillation circuit is adapted to control, for example, a bootstrap circuit included in an EPROM which is erasable by means of ultraviolet rays. The oscillation circuit is comprised of a depletion type MOS transistor used as a resistance in each CR time constant circuit; the gate and the drain or the gate and the source of each depletion type MOS transistor being connected together and the oscillation circuit comprising a delay circuit having its output positively fed back to its input.