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. 04, 2003
Filed:
May. 01, 2002
Turker Kuyel, Rowlett, TX (US);
Kumar Lakshmi Parthasarathy, Ames, IA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A calibrated digital-to-analog converter (DAC) ( ′) has a main DAC ( ) having a digital input and an analog output. An on-chip memory ( ) stores measured INL values of the main DAC at a few selected input codes, and digital interpolation ( ) is used to approximate INL error values at all input codes ( ). To cancel the INL errors of the main DAC, outputs of this digital interpolation are sent to a calibration DAC ( ), which has an analog output subtracted from the analog output of the main DAC. This subtraction can also be done in the digital domain, removing the need for a calibration-DAC when a main DAC with higher bit-count is designed.