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:
Nov. 28, 1995
Filed:
Nov. 15, 1993
Marc Wingender, Grenoble, FR;
Stephane Le Tual, St Egreve, FR;
Thomson-CSF Semiconducteurs Specifiques, Paris, FR;
Abstract
The invention concerns precision analogue-digital converters. For the fine conversion, supplying the low order bits (B0 to Bk) for an analogue voltage Vin to be converted, three ordinary differential amplifiers (ADA, ADB, ADC) are used connected to three voltage references VR(i-1), VR(i), VR(i+1). These three amplifiers supply differential output voltages (VAa, VAb, VBa, VBb, VCa, VCb) that vary as a function of Vin according to normal transfer functions for differential amplifiers. Intersection points of these various transfer curves are detected in interpolation circuits (firstly CIT1, then CIT2, etc). These intersection points are used as intermediate voltage references between the main references. Comparators (CMP0 . . . CMPk), placed at the output of interpolation circuits supply bits (B0 to Bk) indicating the value of Vin with respect to each of these intermediate references.