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. 13, 1985
Filed:
Nov. 16, 1983
Peter S Duryee, Lynnwood, WA (US);
John M Anholm, Jr, Snohomish, WA (US);
John Fluke Mfg. Co., Inc., Everett, WA (US);
Abstract
A calibration circuit for a recirculation of remainder analog-to-digital (A/D) converter heuristically solves a multiple variable conversion equation. Input analog calibration and analog reference signals are compared in a comparator, and when the two signals have a predetermined relationship, the comparator generates an indicator signal. A microprocessor determines a first pattern of digital reference signals that, together with digital calibration signals generated by the microprocessor, causes the comparator to generate the indicator signal and a second pattern of digital reference signals that, together with the input analog calibration signals, causes the comparator to generate the indicator signal. The difference between the first and second patterns of digital reference signals is stored as conversion coefficients.