关键词: 电流舵数模转换器, 失配, 静态误差模型

Abstract: High-resolution current steering digital-to-analog converter (DAC) is one of the key issues in the design of current source transistor matching characteristics. The common method to obtain the matching characteristics of transistors is Monte Carlo simulation, which is time-consuming and related to the performance of the CPU, and has low design efficiency. Theoretical analysis and formula derivation are carried out for the static mismatch of the current steering DAC. According to the characteristics of the static mismatch, the static error model of the current steering DAC is constructed based on MATLAB, which is used to evaluate the influences of the random mismatch of the current source transistors on the integral nonlinearity yield of the DAC. It has the characteristics of high accuracy and high efficiency.

Key words: current steering digital-to-analog converter, mismatch, static error model