基于CCTA的可级联的电流模式多功能滤波器  

Cascadable current-mode multifunction filter configuration using CCTA

作　　者：周细凤[1] 曾荣周[2] 孙静[1] 

机构地区：[1]湖南工程学院电气信息工程学院,湖南湘潭411101 [2]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《计算机工程与应用》2015年第19期231-235,共5页Computer Engineering and Applications

基　　金：湖南省教育厅项目(No.11C0321);湖南省自然科学基金(No.14JJ6040);湖南工程学院博士启动基金

摘　　要：通过级联积分器单元的方式,设计了一种基于电流传输跨导放大器(CCTA)的可级联的电流模式多功能高阶滤波结构。通过选择合适的输入电流,该结构能够同时实现低通、带通、高通和带阻等功能,其品质因素Q和角频率ω0都可以通过调整CCTA的偏置电流(IB)来实现电调谐。此n阶滤波器仅仅包含n个CCTA和n个接地电容,具有最少的有源和无源器件数目,电路结构简单,非常适合制作全集成IC。最后采用PSPICE仿真验证了所设计电路的性能。A cascadable current-mode multifunction filter using CCTA is proposed. By properly selecting the applied input currents; it can simultaneously realize low-pass, band-pass, all-pass, and high-pass and band-reject responses from one topology without any component matching conditions. Both of the parameter coo and Q can be tuned electronically inde- pendently over a wide range by varying the bias current（ 18 ） of the CCTA without affecting each other. Additionally, the proposed nth-order filter is only composed by n CCTAs and n grounded capacitors. So the configuration has the least number of passive and active components;the proposed configuration enjoys having Simple structure, and it is highly suit- able for IC implementation. The realized circuits are simulated with SPICE to exhibit its performance.

关 键 词：N阶滤波器 电流模式 电流传输跨导放大器(CCTA) 

分 类 号：TN911.71[电子电信—通信与信息系统]