一种AB类输出的高精度CMOS正向电流传输器  

A High Accuracy CMOS Current Conveyor Based on Class AB Output Stage

作　　者：彭建华[1] 陈向东[1] 杜广涛[1] 

机构地区：[1]西南交通大学信息科学与技术学院

出　　处：《微电子学》2008年第2期294-297,301,共5页Microelectronics

基　　金：国家自然科学基金资助项目(60572026);四川省学术与技术带头人培养基金重点资助项目(Q024131103010018);西南交通大学科技发展基金资助项目(2006A05)

摘　　要：基于CSMC0．5μm工艺，在两级CMOS运放的基础上，设计了一种结构简单、电压跟随能力强和电流传输精度高的第二代正向电流传输器（CCII＋）。设计中，通过采用AB类推挽输出方式，达到了降低静态功耗和提高电流驱动能力的目的；应用密勒电容与调零电阻串联的补偿方式，有效地改善了CCII＋的频率响应特性；分析了AB输出级晶体管对静态电流的影响。HSPICE仿真结果表明，在1．5V供电电压下，该CCII＋的电压跟随误差仅为0．0534dB，-3dB带宽达到201MHz；电流传输误差为0dB，-3dB带宽达到54．4MHz，X端输入电阻低于0．57Q，电流驱动能力为-0．2～1．2mA，电路功耗为2．54mW。A novel CMOS class AB positive second generation current conveyor （CCII＋） with a 1.5 V power supply was presented, which achieves an accurate voltage transfer by CSMC 0. 5 μm technology. It is based on a two-stage CMOS differential operational amplifier and also provides accurate current and voltage control. With its simple circuit topology with a class AB output stage, the proposed CCII＋ has a high current driving capability and low power consumption. The frequency response property was effectively improvedl by using compensation circuit consisting of Miller capacitors and zeroing resistors In addition, the impact of class AB transistors on the standby current was analyzed. Results from HSPICE simulation based on CSMC＇ s 0. 5 l_an technology showed that the CCII＋ had a voltage transfer error of 0. 0534 dB with -3 dB frequency bandwidth of about 201 MHz , and a current transfer error of 0 dB with -3 dB frequency bandwidth of 54. 4 MHz. Moreover, the resistance at terminal X was as low as 0. 57 Ω, and cttrrent driving capability was from -0. 2 mA to 1. 2 mA with a power consumption of only 2. 54 roW.

关 键 词：电流传输器 AB类推挽输出 CMOS 

分 类 号：TN432[电子电信—微电子学与固体电子学] TN722.5