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. 23, 1996
Filed:
Nov. 15, 1993
Hamid Partovi, Westboro, MA (US);
Donald A Draper, San Jose, CA (US);
Intergraph Corporation, Huntsville, AL (US);
Abstract
A carry indicating circuit selectively generates a carry-in signal indicating whether the addition of a first plurality of bits results in a carry. A first carry chain circuit selectively generates a first carry-out signal indicating whether the addition of a second plurality of bits together with a carry from the addition of the first plurality of bits results in a carry, and a second carry chain circuit selectively generates a second carry-out signal indicating whether the addition of the second plurality of bits without a carry from the addition of the first plurality of bits results in a carry. Selection circuitry, coupled to the carry indicating circuit and to the first and second carry chain circuits, selects either the first carry-out signal or the second carry-out signal in response to the carry-in signal. The first and second carry chain circuits and/or the selection circuitry each includes a first transistor connected to a second transistor so that the first and second transistors may be initially biased in a nonconducting state when a first node is at a first voltage potential and a second node is at a second voltage potential, the first voltage potential being different from the second voltage potential. Altering circuitry is provided for altering the voltage potential at the first and second nodes for causing the first and second transistors to be in a conducting state and for accelerating the voltage at the first and second nodes to final voltage potentials.