Patent ID: 8872687
Filing Date: 2014-10-28
Classification: H03M

Abstract:
1. A digital to analog converting method insensitive to code-dependent distortions, the method being implemented by a digital to analog converter (DAC) having a plurality of unit current sources and two output nodes, the method comprising the steps of: receiving a plurality of binary-weighted input codes and generating a respective random rotation number for each binary-weighted input code, wherein each binary-weighted input code is interpreted as a unit current control code for selecting and controlling the plurality of the unit current sources; rotating each unit current control code of each binary-weighted input code according to the respective random rotation number for generating rotated digital codes; inserting a pre-determined return-to-zero (RTZ) code after each rotated digital code; and producing analog signals by the plurality of the unit current sources selected and controlled by the rotated digital codes and the pre-determined RTZ code.