一种高阶通用对数滤波器的设计方法  

An Approach to Designing Higher-Order Universal Log-Domain Filters

作　　者：张玲[1] 曾以成[1] 杨红姣[1] 

机构地区：[1]湘潭大学光电工程系智能光电技术研究所,湖南湘潭411105

出　　处：《微电子学》2010年第3期378-381,共4页Microelectronics

基　　金：国家自然科学基金资助项目(60972147);湖南省教育厅一般项目(08C865)

摘　　要：提出一种高阶通用对数滤波器的设计方法。通过分析与利用n阶通用电流模式滤波器的传递函数,建立一种新的系统状态空间表达,使用模块化的结构设计方法,先设计单元模块电路,然后再按一定规则组合成整体电路。设计的整体电路能实现低通、高通、带通和带阻等多种滤波功能,且电路结构简单、易于集成、无源灵敏度很低。Pspice仿真表明,设计方法是可行的。A synthesis approach was proposed for higher order universal log-domain filter.A new state-space description of the system was built by analyzing and utilizing transfer functions of the n-th-order universal current mode filter.Corresponding circuits of each item,designed with the method of modular structure,were integrated into one circuit according to certain rule.Low-pass,high-pass,band-pass and notch filters could be realized with the proposed circuit,which is simple in structure and easy for integration,and has low passive sensitivity.Pspice simulation demonstrated the effectiveness of the design approach.

关 键 词：通用滤波器 对数滤波器 BJT 跨导线性单元 状态空间 

分 类 号：TN713.8[电子电信—电路与系统]