Computer Engineering and Applications ›› 2015, Vol. 51 ›› Issue (19): 231-235.

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Cascadable current-mode multifunction filter configuration using CCTA

ZHOU Xifeng1, ZENG Rongzhou2, SUN Jing1   

  1. 1.College of Electrical & Information Engineering, Hunan Institute of Engineering, Xiangtan, Hunan 411101, China
    2.The State Key Laboratory of Electronic Thin Films & Integrated Devices, University of Electronic Science & Technology of China, Chengdu 610054, China
  • Online:2015-09-30 Published:2015-10-13

基于CCTA的可级联的电流模式多功能滤波器

周细凤1,曾荣周2,孙  静1   

  1. 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

Abstract: 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 [ω0] and [Q] can be tuned electronically independently over a wide range by varying the bias current([IB]) 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 suitable for IC implementation. The realized circuits are simulated with SPICE to exhibit its performance.

Key words: nth-order filter, Current Mode(CM), Current Conveyor Transconductance Amplifier(CCTA)

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。

关键词: [n]阶滤波器, 电流模式, 电流传输跨导放大器(CCTA)