一种高速高分辨率电流舵D/A转换器的设计  

Design of a High-Speed and High-Resolution Current-Steering D/A Converter

作　　者：唐守志[1,2] 李儒章[2] 石建刚[2] 

机构地区：[1]重庆邮电大学,重庆400065 [2]模拟集成电路重点实验室,重庆400060

出　　处：《微电子学》2010年第5期631-635,639,共6页Microelectronics

摘　　要：基于0.18μm CMOS工艺,设计了一种电源电压为3.3 V/1.8 V(模拟电路部分电源电压为3.3 V,数字电路部分电源电压为1.8 V)、最大刷新率为200 MSPS、分辨率为14位的高速D/A转换器(DAC)。该DAC采用传统的5-4-5温度计码与二进制权重码混合编码的分段电流舵结构。对电路中的关键模块,如运算放大器、带隙基准源,进行了优化设计;给出了整体电路的版图设计。仿真结果显示,采样频率为200 MHz时,DAC的SFDR为87 dB左右。A 14-bit high-speed D/A converter IC with a maximum refresh rate of 200-MSample/s was designed based on 0.18 μm CMOS process.The circuit operates at supply voltage of 3.3 V/1.8 V（analog/digital）.A segmented current steering architecture coded with traditional 5-4-5 thermometer code and binary weighted code was used for the D/A converter.Key blocks of the circuit,such as operational amplifier and bandgap voltage reference,were optimized.Simulation results showed that the DAC had an SFDR of about 87 dB at a sampling frequency of 200 MHz.

关 键 词：CMOS 电流舵 D/A转换器 

分 类 号：TN792[电子电信—电路与系统]