基于新颖CCCⅡ的电流模式采样保持电路设计  

Design of a Current-Mode Sample-and-Hold Circuit Based on CCCⅡ

作　　者：李湛[1] 王春华[1] 彭关超[1] 王会杰[1] 

机构地区：[1]湖南大学计算机与通信学院,湖南长沙410082

出　　处：《微电子学与计算机》2011年第9期55-58,共4页Microelectronics & Computer

基　　金：国家自然科学基金项目(60676021)

摘　　要：设计了一种新颖的第二代电流控制电流传输器(CCCⅡ).该模块电路采用了CMOS复合管构成的跨导线性环结构,并通过外加偏置电流IB的方法来控制CCCⅡ X端的寄生电阻RX.当偏置电流源IB=10μA时,X端的寄生电阻RX=2.16kΩ,与理论值的误差只有1.32%.基于提出的CCCⅡ实现了一种电流模式的采样保持电路.基于TSMC 0.18μm CMOS工艺,采样时钟频率为100MHz时,该采样保持电路对正弦电流信号采样保持有着很高的采样精度,其正确性通过PSPICE的仿真结果得以验证.This paper proposed a novel current controlled second generation current conveyor（CCCⅡ）.The CCCⅡ is based on translinear loop of compound CMOS transistors,which adjust the parasitic resistance with the outside biasing current IB.When the biasing current IB is 10 μA,the parasitic resistance of terminal X is 2.16 kΩ.The error compared with the theoretical value is only 1.32%.Based on this CCCⅡ,a current mode sample-and-hold circuit is proposed.When the frequency of the sampling clock signal is 100 MHz,the circuit can achieve excellent sampling accuracy in TSMC 0.18 μm CMOS process.The working principle of the circuit is discussed,and the simulation results confirm the theory analysis.

关 键 词：电流模式 复合管 跨导线性环 采样保持电路 

分 类 号：TN432[电子电信—微电子学与固体电子学]