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. 29, 1978
Filed:
Aug. 31, 1977
James F Dubil, Warrenton, VA (US);
Howard N Leighton, Rockville, MD (US);
Raymond J Wilfinger, Lagrangeville, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A charge transfer device capacitive ratio voltage multiplication circuit has been devised which solves the problem of cumulative DC bias offset by adding a DC signal compensation branch to prevent the accumulation of DC offset potential. The circuit can be expanded to form a weighted sum of multiple inputs which does not incur any corresponding DC bias offset, by making the sum of the characteristic capacitances of each of the multiple inputs equal to the characteristic capacitance of the output portion of the charge transfer device circuit. The circuit allows arithmetic operations to be performed on input signals solely in the charge domain without the necessity of converting charge to voltage to charge, thereby avoiding losses, distortions, offsets and a reduction in dynamic range which would otherwise result.