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:
Jan. 02, 2001
Filed:
Apr. 27, 2000
Yasuhiro Hashimoto, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A trimming circuit for a semiconductor device performs both simulated fuse breakage and actual fuse breakage by selectively short-circuiting an adjusted device. The trimming circuit includes a switch connected in parallel with the adjusted device. Activating the switch causes the adjusted device to be by-passed or short-circuited. A first external terminal is connected to the switch to apply a first control signal to the switch. A second external terminal is provided for receiving a second control signal. A fuse circuit is connected between a high potential power supply and a low potential power supply and between the first and second external terminals. For hypothetical fuse breakage, the first control signal is activated to activate the switch and by-pass the adjusted device. For actual fuse breakage, the second control signal is activated such that it has a potential greater than the first control signal so that a current flows through the fuse circuit, thereby breaking the fuse. When the fuse is broken, the switch is activated, thereby causing the adjusted device to be by-passed.