具有高频补偿的CMOS MOCCII  

A novel MOCCII with high frequency compensation

作　　者：王春华[1] 何海珍[1] 胡明祥[1] 曹捷[1] 周玲[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：《电路与系统学报》2009年第6期63-70,共8页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60676021);湖南省自然科学基金(04JJ3039)

摘　　要：为了使MOCCII(多端输出的第二代电流传输器)能工作于高频段,本文提出了一种具有高频补偿的CMOS MOCCII电路。对于电流传输函数IZ/IX及I Z/IX,采用在电流镜中加一个可调电阻方法,使得电流镜的传输函数由一阶系统变成可调极点的二阶系统,调节电阻大小,使得极点远离S平面原点,从而提高电流镜频带宽度。对于电压传递函数VX/VY,在X与Y之间加并行差分对,以增加等效跨导,提高VX/VY的频带宽度,同时,在X与Y之间的负载电流镜中加入一个电阻,以进一步提高VX/VY的频带宽度。仿真表明,VX/VY的-3dB截止频率由补偿前的544MHz提高到补偿后的1.053GHz;IZ/IX及I Z/IX的-3dB截止频率分别由补偿前的510MHz、400MHz提高到补偿后的1GHz。最后,作为应用,给出了由补偿前后MOCCII所构成的电流模式滤波器。In order to make MOCCII （second generation current conveyor with multiptle outputs）, the paper presents a novel CMOS MOCCII circuit with high frequency compensations. For the current transfer function IZ/IX and IZ/IX, we introduce an adjustable resistance in the current mirrors, which makes the current mirrors from first order system become second order one with adjustable poles, and by controlling the resistance, lets the poles keep away from the origin in the complex plane S, consequently improves the bandwidth of the current mirrors. For the voltage transfer function VX/VY, we add the parallel differential pairs between the terminals X and Y to increase the equivalent transconductance, and improve the bandwidth of VX/VY. At the same time, a resistance is introduced in the load current mirrors between X and Y to enhance the bandwidth of VX/VY greatly. The simulation results indicate that the -3dB cut-off frequency of VX/VY has been improved from 544MHz before the compensation to 1.053GHz after compensation, and the -3dB cut-off frequencies of IZ/IX and IZ/IX have respectively been improved from 510MHz,400MHz before compensation to 1GHz after compensation.

关 键 词：模拟集成电路 MOCCII 有源滤波器 差分对 

分 类 号：TN432[电子电信—微电子学与固体电子学] TN710.2