采用FTFN实现的三输入单输出二阶通用滤波器  

Realization of A Three-Input and Single-Output Second-Order Universal Filter Based on FTFN

作　　者：席燕辉[1] 刘兵华 彭良玉[3] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410077 [2]长沙中联重工科技发展股份有限公司,湖南长沙410013 [3]湖南师范大学物理与信息学院,湖南长沙410081

出　　处：《科技通报》2006年第2期213-216,共4页Bulletin of Science and Technology

基　　金：湖南省教育厅资助科研项目(04C346)

摘　　要：本文提出了一种新的基于四端浮零器FTFN(four-terminal floating nullor)实现的三输入单输出多功能通用滤波器。此电路仅使用了二个四端浮零器,三个接地电阻和二个接地电容。在不改变电路结构的条件下,通过输入端的不同组合能同时实现低通、高通、带通、带阻、全通五种滤波功能。此电路具有如下特点:使用的元件数目最少;输出阻抗很高;电阻电容均接地,易于集成;有源和无源灵敏度都很低;滤波器的特征频率和品质因数能独立调节。A novel second-order current-mode filter with three-input and single-output is presented based-on four-terminal floating nullor （FI＇FN） in this paper. This circuit uses only two four-terminal floating nullors （FTFNs）, three grounded resistors and two grounded capacitors. The device is capable to perform the functions of second-order low pass, high pass, band pass, band stop, all pass filtering by selecting one of the three inputs or their proper combinations without changing the circuit configuration. It has some advantages： minimum components, high output-impedance, low active and passive sensitivities, more convenient integration. The natural frequency and the quality factor can be tuned independently. The results of computer simulation show theoretical analysis is correct.

关 键 词：电流模式 滤波器 四端浮零器 模拟集成电路 

分 类 号：TN713[电子电信—电路与系统]