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:
Dec. 03, 1996
Filed:
Mar. 30, 1994
Bernd M Rundel, Tucson, AZ (US);
Burr-Brown Corporation, Tucson, AZ (US);
Abstract
A conversion circuit digitizes first and second differential analog signals conducted by first and second conductors for digital processing in a motor control system. The conversion circuit includes an analog-to-digital conversion circuit. The analog-to-digital conversion circuit includes a CDAC having a charge summing conductor connected to an input of a bit decision comparator and first and second simultaneously sampled differential sample and hold MSB circuits connected to the charge summing conductor. The first and second differential analog signals are simultaneously sampled and held in the first and second differential sample and hold MSB circuits, respectively, and then are sequentially converted to digital numbers by the analog-to-digital conversion circuit. The first and second analog signals are processed as differential signals all the way from the analog input of the conversion circuit to inputs of a bit decision comparator in the analog-to-digital conversion circuit, and thereby maintain a high level of common mode noise rejection. Programmable reference voltage levels are supplied to the analog-to-digital conversion circuit to accommodate a wide range of amplitudes of the first and second differential analog signals.