在电路误差、电路占用芯片面积相互折中和妥协的前提下提出了一种8+4结构的电流驱动型数模转换器.采用Q2randomwalk方法设计了一个新型的双中心对称的电流矩阵,确保数模转换器的线性度.分析并求出了最佳电平交叉点,设计了电平钳位锁存器对开关电平限幅,DAC动态性能得到改善.在12位分辨率下,刷新率达到300MHz以上. A 8 + 4 structure current-driven digital-to-analog converter is proposed on the premise of the circuit error, the circuit area occupied by the chip compromise and compromise with each other.A new bimodal symmetrical current matrix is ​​designed by Q2randomwalk method, The linearity of the analog-to-digital converter is analyzed and the best level crosspoint is analyzed and the level clamp of the level clamp is designed to limit the switching level and the dynamic performance of the DAC is improved. At 12-bit resolution, the refresh rate Reach 300MHz above.