Analysis and Modeling of System Performance Based on Random Matching Errors, Gradient Errors, and Finite Output Impedance of Current-source DAC

Abstract With the development of communication technology, performance digital-to-analog converters as last link in signal processing is particularly important. This paper analyzes errors current rudder DAC and their effect on performance. Different compensation methods are proposed to compensate for or eliminate errors. Through system modeling, it concluded that under conditions static parameters DNL<0.5LSB, INL<0.5LSB, dynamic SFDR>90dB SNDR>70dB, random matching error should be less than 0.001, gradient 1E-5 admittance rate 1E-7. The correctness theoretical analysis can verified through modeling simulation, providing accurate guidance direction circuit design greatly shortening cycle.