基于晶体管电流源的1比特DAC设计  

A Design of 1-bit DAC Based on Transistor Current-source

作　　者：焦鹏[1,2] 吴虹[1] 刘玉清[2] 李子彧[1] 陈乐[1] 

机构地区：[1]南开大学电子信息与光学工程学院,天津300071 [2]驻四九七厂军事代表室,重庆400071

出　　处：《南开大学学报（自然科学版）》2014年第6期1-5,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：国家自然科学基金(60872026);天津市应用基础与前沿技术研究计划(13JCZDJC26000,13JCQNJC01000);高等学校博士学科点专项科研基金(20110031110028)

摘　　要：提出了一种基于晶体管电流源的1比特DAC电路设计,电路由晶体管、电阻等分立器件构成,电路前端是FPGA将数字信息‘1’和‘0’编码为4路TTL电压脉冲,4路TTL电压脉冲分别控制4路晶体管电流源,然后将输出叠加为"阶梯"余弦信号,最后经过低通滤波得到适合基带传输的模拟信号,电路在ADS软件中仿真验证.A design of 1-bit DAC based on transistor current-source has been presented, and the circuit consists of transistors, resistors and other discrete devices. Firstly, 4-way TTL voltage pulses is translated from digital information ＇1＇ and ＇0＇ by FPGA, and then controls 4-channel transistor current-source adding up to ＂ladder＂ cosine signal, finally, analog cosine signals for baseband transmission has been got after low-pass filter. The whole Circuit design is verified in the ADS software simulation.

关 键 词：DAC 晶体管 电流源 

分 类 号：TN929.533[电子电信—通信与信息系统]