一种低压高线性度电流差分跨导放大器  

Design of a low voltage highly linear CDTA

作　　者：何小莲[1] 宋树祥[1] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004

出　　处：《电子元件与材料》2016年第4期61-65,共5页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.61361011);广西高校优秀青年骨干教师培养计划资助项目(No.GXQG022014002);广西自然科学基金资助项目(No.2014jj AA70058)

摘　　要：基于TSMC 180 nm工艺库,设计了一款低电压高线性度的电流差分跨导放大器(CDTA,在电路的设计中采用了具有自适应尾电流源偏置结构来提高其线性度。利用Cadence和Spectre软件进行电路设计与仿真。结果显示,在系统典型应用环境下,当Z端的电压在–1.4^+1.3 V变化时,X端的电流变化范围达到–100^+100μA;I_Z/I_P,I_Z/I_N的–3 d B带宽分别为230.5 MHz和236.4 MHz;Z端和X端阻抗分别为8 M?和2.3 M?。该CDTA具有低输入阻抗和高输出阻抗、低电压、高线性度的良好性能,已用于增益可调的有源滤波器设计。Based on TSMC 180 nm process,a low voltage highly linear current differencing transconductance amplifier（CDTA）was designed.The cross-coupled self adapting tail current source bias structure was used to improve linearity in the design of the circuit.Using Cadence for circuit design and Spectre software for circuit simulation,the CDTA was simulated.The results show that under the environment of typical applications in the chip system,with the power supply Z port voltage changes in –1.4-＋1.3 V,X port current varies linearly from –100 μA to 100 μA.The –3 d B bandwidths of I_Z/I_P and I_Z/I_N are 230.5 MHz and 236.4 MHz,respectively.Impedances of Z port and X port are 8 M？ and 2.3 M？,respectively.The proposed CDTA has low input and high output impedances,low voltage and high linearity properties.The CDTA has been successfully applied in high order active filter with tunable gain.

关 键 词：电流差分跨导放大器 电流模电路 有源滤波器 通用双二阶滤波器 高阶滤波器 线性度 

分 类 号：TN43[电子电信—微电子学与固体电子学]