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:
Feb. 07, 1989
Filed:
Aug. 11, 1987
Richard K Hester, Whitewright, TX (US);
Michiel de Wit, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An A/D converter includes a positive array of binary weighted capacitors with a common top plate (12) and a negative array of binary weighted capacitors with a common top plate (32). The positive and negative arrays are input to a differential amplifier (10) for measuring the differential voltage across the top plates. During the sample time, a differential input voltage is sampled on the bottom plates of the capacitors and the top plates of the capacitors are disposed at the common mode voltage of the input signal. This limits the input voltage across the capacitors to one-half the differential voltages of the input signal. During the hold mode and the redistribution mode, this presents a predetermined common mode input voltage to the amplifier (10) which is independent of the input signal.