基于CCTA的可级联的电流模式多功能滤波器

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。

Cascadable current-mode multifunction filter configuration using CCTA

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.