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. 21, 2006
Filed:
Dec. 08, 2004
Turker Kuyel, Austin, TX (US);
Turker Kuyel, Austin, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A system and method of calibrating a digital-to-analog converter (DAC) such as a resistor string DAC that reduces costs by making more efficient use of integrated circuit chip area, without requiring analog calibration circuits. The DAC calibration system includes a main DAC to be calibrated, a memory, and calibration logic circuitry for performing arithmetical operations. The memory stores a predetermined number of digital code values in respective memory locations, which are indexed by corresponding voltage values. The digital code values represent DAC input code values which, when applied to the main DAC, would generate the corresponding index voltage values as DAC output voltage levels. The stored DAC input code values and the corresponding DAC output voltage levels, which are determined using an external tester, define piecewise linear (PWL) breakpoint code values of a PWL approximation of the DAC transfer function.