电调谐CCCⅡ-C电流模式二阶带通滤波器  

A new electronically tunable current mode second-order bandpass filter based on CCCⅡ-C

作　　者：宋树祥[1] 王小华[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：《电路与系统学报》2011年第5期52-54,59,共4页Journal of Circuits and Systems

基　　金：国家自然科学基金(61061006);广西师范大学博士启动基金(20091205)

摘　　要：本文提出一种新的特征参数可被直流电流调谐的CCCⅡ-C电流模式二阶带通滤波器。它是在基本带通滤波器的基础上增加一个反馈电流放大器,通过调节放大器的放大系数A来调谐滤波器的截止频率,品质因素等参数。该电路由4个CCCⅡ及2个接地电容元件构成,无需接任何电阻元件,具有很低的有源和无源灵敏度。滤波器的Spectre仿真结果表明所提出的电路设计原理和实现方案正确可行。A new second-order current-mode bandpass filter whose characteristic parameters is electronically tunable by a DC current is introduced.When an external current amplifier is added to a second-order filter cell,the characteristic frequency and Q-factor of the resulting filter can then be modified by acting only on the value of the gain A of this amplifier.Filter circuit only consists of four CCCⅡs and two grounded C elements.The sensitivities of filter are very smal1.All the properties of these new filters are examined.Spectre simulation results of a practical example are given to confirm the theoretical analysis.

关 键 词：电调谐 电流控制的电流传输器 电流放大器 

分 类 号：TN713[电子电信—电路与系统]