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:
Oct. 28, 2014
Filed:
Sep. 12, 2013
National Cheng Kung University, Tainan, TW;
National Cheng Kung University, Tainan, TW;
Abstract
A digital to analog converting method insensitive to code-dependent distortions is implemented by a digital to analog converter (DAC) having a plurality of unit current sources. A plurality of binary-weighted input codes are received by the DAC and rotated to generate dynamic element matched (DEM) encoded signals. Between the adjacent DEM encoded signals is a purposely added pre-determined return-to-zero (RTZ) code. When the DAC generates analog outputs according to the alternately received DEM encoded signals and the RTZ codes, a zero-voltage phase during the level transition of the analog outputs is obtained by the RTZ codes. With the DEM encoded signals and the RTZ codes, each level transition is independent. Furthermore, code-dependent problems such as mismatch- and transient-related distortion are mitigated by the DEM encoded signals.