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:
Apr. 29, 1997
Filed:
Feb. 09, 1996
Tadashi Kawahara, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, East Hills, NY (US);
Abstract
The present invention provides a constant current circuit for suppressing operation of parasitic thyristor and for preventing short-circuit of IC, even if high voltage such as a thunder is applied to a power source which increases a power supply potential Vcc momentarily. A constant current circuit of the present invention comprises a first current mirror circuit having a first pair of transistors, a second current mirror circuit having a second pair of transistors, and a MOS type capacitor being connected between the collector electrodes of said first pair of transistors and being formed in a second well area of the semiconductor substrate which is adjacent to the first well area where the first and the second mirror circuits are formed thereon.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile