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:
Aug. 06, 2002
Filed:
Aug. 29, 2001
Thomas A. Gaiser, Amherst, NH (US);
Kenneth J. Stern, Newton, MA (US);
Farhad Vazehgoo, Tynesborough, MA (US);
Vincenzo DiTommaso, Arlington, MA (US);
William L. Walter, Lowell, MA (US);
Edward B. Hilton, Wayland, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A precision SET-RESET logic circuit and operating method separate a latch function from the critical signal path which produces the logic outputs. In a particular implementation the logic circuit includes two differential switch pairs controlled respectively by SET and RESET inputs, with respective enable circuits for the differential pair controlled by the output of the latch circuit. The SET and RESET differential switch pairs respond faster than the latch circuit to a change to the input SET-RESET state. A logic output is initially produced by establishing a first current path through. the differential switches and enable circuits in response to a new logic input, and then latched via a different current path.