一种轨对轨输入的低压低功耗CMOS电流传输器  

Low-Voltage and Low-Power CMOS Current Conveyor Based on Rail-to-Rail Input Stage

作　　者：彭建华[1,2] 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,四川成都610031 [2]成都华微电子系统有限公司,四川成都610041

出　　处：《微电子学与计算机》2008年第11期72-76,共5页Microelectronics & Computer

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

摘　　要：基于CSMC 0.5μm工艺,在1.5 V供电电压下,设计了一种功耗低、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,通过采用轨对轨的输入结构,有效地提高了信号摆幅;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,并分析了AB输出级晶体管对静态电流的影响作用.HSPICE仿真结果表明,该CCII+的电压跟随误差仅0.0002 dB,-3 dB带宽达到11.7 MHz;电流传输误差为0.0007 dB,-3 dB带宽达到20 MHz,X端输入电阻低于28Ω,电流驱动能力为-0.62 mA^1.07 mA,电路功耗仅为105.68μW.In this paper,a novel CMOS rail-to-rail positive second generation current conveyor（CCII＋） with a 1.5 V power supply is presented which achieves an accurate voltage transfer and dissipates less power.It is based on a two-stage CMOS differential operational amplifier and also provides accurate current and voltage control.It also adopts the rail-to-rail input structure to improve the signal swing.Thanks to 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 properties is effectively improved by using compensation circuit consisting of Miller capacitors and zeroing resistors.In addition, the impact of class AB transistors on the standby current is analyzed.Simulation results using HSPICE with CSMC 0.5 μm technology are also presented,simulation results show that the CCII＋ has achieved a voltage transfer error equal to a 0.0002 dB with-3 dB frequency of about 11.7 MHz and the current transfer error is 0.0007 dB with-3 dB frequency of 20 MHz.Moreover,the resistance at terminal X is as low as 28 Ω,current driving capability is from-0.62 mA to 1.07 mA with a power consumption of only 105.68 μW.

关 键 词：电流传输器 轨对轨 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