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:
Feb. 10, 2004
Filed:
Jul. 13, 2000
Abstract
A computing circuit capable of computing an absolute difference with high-speed analog computation, a computing apparatus capable of computing the sum of absolute differences and a semiconductor computing circuit achievable with simple circuitry and suitable for use in such a computing circuit or apparatus. The computing circuit capable of computing the absolute difference includes a large input selection circuit which outputs either a first signal or a second signal whichever is larger, a small input selection circuit which outputs either the first and second signals whichever signal is smaller, and a subtraction circuit which subtracts the output of the small input selection circuit from the output of the large input selection circuit The subtraction circuit includes a capacitor a first switch provided between a first terminal of the capacitor and the output of the large input selection circuit a second switch provided between the first terminal of the capacitor and the output of the small input selection circuit and a third switch provided between a second terminal of the capacitor and a terminal connected to a prescribed potential. The computing apparatus capable of computing the sum of absolute differences includes a plurality of such computing circuits, and computes the sum of the outputs of the computing circuits by using a summing circuit.