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:
Oct. 01, 1991
Filed:
May. 18, 1990
Eliot Mayer, Tewksbury, MA (US);
Louis R Poulo, Andover, MA (US);
Jeffrey L Sauer, Lynn, MA (US);
Hans J Weedon, Salem, MA (US);
Analogic Corporation, Peabody, MA (US);
Abstract
An autozero compensation system for autozeroing the output of a data conversion circuit comprising a floating point amplifier and an analog-to-digital converter. The autozero compensation system comprises a source for generating a desired offset voltage, a plurality of digital counters, one for each gain setting of the amplifier, for storing values which are functions of the offset voltages for the gain settings, and a comparator for comparing the output of the A/D converter with the desired offset. Periodically, each of the counters in the autozero circuit is updated for each gain setting by setting the analog input of the amplifier to system ground and the gain of the amplifier set to each of the gain settings, so that the output of the comparator is used to update each of the counters. The outputs of the counters are each converted to analog form by a D/A converter and used to provide the offset correction voltage to the floating point amplifier.