一种高速10位温度计码DAC的设计  

5 V 10 Bit High Speed Segmented Current Steering CMOS DAC

作　　者：刘凡[1] 吴金[1] 黄晶生[1] 薛海卫[2] 姚建楠[1] 

机构地区：[1]东南大学无锡分校,江苏无锡214028 [2]中国电子科技集团58所,江苏无锡214035

出　　处：《电子器件》2007年第1期283-286,共4页Chinese Journal of Electron Devices

摘　　要：在研究高速D/A转换器的基础上,设计了一种5V10bit高速分段式温度计码D/A转换器.设计的5-1-4温度计译码电路以及对版图布局的优化,使得DAC的DNL和INL最小,该电路的核心由三段式温度计编码控制的47个电流源构成.基于上华0.5μm工艺,采用HSPICE仿真工具对其进行仿真,得到在200MHz的采样频率下对50Ω负载满量程输出为45mA,非线性误差为DNL<0.5LSB,INL<0.75LSB.A 5 V, 10 bit high speed segmented current steering digital to analog converter was designed. A 5-1-4 thermometer decoder circuits and optimized layout array were designed to reduce DNL and INL. The core of the circuit contains the 47 thermometer coding current cells. Based on the CSMC 0. 5 tan mixed signal CMOS technology, the DAC simulation results by HSPICE can deliver up to 45 mA full scale current into a 50Ω load with less nonlinearity error of DNL〈0. 5LSB, INL〈0. 75LSB at 200 MHz sample rate.

关 键 词：DAC 电流模式 匹配 温度计编码 

分 类 号：TN402[电子电信—微电子学与固体电子学]