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:
May. 19, 2009
Filed:
Nov. 16, 2007
Jerzy Antoni Teterwak, Colorado Springs, CO (US);
Jerzy Antoni Teterwak, Colorado Springs, CO (US);
Maxim Integrated Products, Inc., Sunnyvale, CA (US);
Abstract
An apparatus and method for reducing distortion from an output of a digital-to-analog converter (DAC). In one implementation, the distortion being reduced is third order harmonic distortion caused by charge transfer effects and instantaneous output impedance drop during switching. Each of the embodiments includes a module adapted to generate a distortion correction signal being a function of the input digital signal, the full scale code of the DAC, the load resistance, the conversion rate of the DAC, and a proportionality constant. In another implementation, the distortion being reduced is higher order harmonic distortion caused by timing skew between a main DAC and a least significant bit (LSB) DAC. Each of the embodiments includes a module adapted to generate a distortion correction signal being a function of the input digital signal, the number of levels covered by the LSB DAC, the conversion rate of the DAC, and the timing skew.