一种相位量化DAC中电流源电路研究  

Study on Circuit of Current Source in Phase Digitizing DAC

作　　者：魏恒[1] 邹振杰[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2015年第6期28-31,共4页Radio Engineering

摘　　要：由于相位量化数模转换器(DAC)转换精度和转换速度的不断提高,因此电流源模块需要满足更高的性能要求。介绍了一种电流源的电路结构,分析了该结构的优缺点,采用了一种减小工艺误差和器件失配的版图设计方法。基于90 nm CMOS工艺模型进行仿真,仿真结果表明,在2 GHz的工作频率下该电流源结构仍能保持较大的输出阻抗特性和较高的输出精度。Owing to the continual enhancement of conversion accuracy and speed of phase digitizing DAC, higher performance current source is demanded.A circuit structure of current source is introduced,the merits and shortcomings are analyzed,and a method for layout design of reducing the process variation and device mismatch is adopted.The simulation is performed based on 90 nm CMOS process,and the results show that this structure has high output impedance and accuracy at 2 GHz clock rate.

关 键 词：相位量化DAC 电流源 输出阻抗 

分 类 号：TN432[电子电信—微电子学与固体电子学]