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:
Sep. 23, 2003
Filed:
Oct. 09, 2002
Applicant:
Inventors:
Frederic Boutaud, Belmont, MA (US);
Sean M. FitzPatrick, Westford, MA (US);
Paul D. Krivacek, Winchester, MA (US);
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/037 ;
U.S. Cl.
CPC ...
H03K 3/037 ;
Abstract
Described is a Schmitt trigger cell that can be disabled under conditions of unknown gate voltages (e.g., floating or toggling input) such that the core is isolated from the Schmitt trigger input. This is accomplished by circuitry that disables current flow through those transistors whose gate voltages are unknown during such conditions and that forces a known output onto the output terminal.