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:
Nov. 25, 2008
Filed:
Dec. 07, 2006
Dan P. Bernard, Austin, TX (US);
John C. Schiff, Round Rock, TX (US);
Glen A. Wiedemeier, Austin, TX (US);
Dan P. Bernard, Austin, TX (US);
John C. Schiff, Round Rock, TX (US);
Glen A. Wiedemeier, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A protection circuit with a positive field effect transistor coupled to a power source, a negative field effect transistor connected to a pass-gate and a circuit ground, a circuit input terminal, a multi-level source of protection voltage coupled to an external circuit and at least three additional field effect transistors. A drain of the negative field effect transistor couples to a gate of the positive field effect transistor. When the circuit input terminal is low the pass-gate is on; when the circuit input terminal is high the pass-gate is off. Embodiments of the invention also include stacks of three or more field effect transistors.