宽频二阶程控低通滤波器的设计  

Design of the broadband programmed second-order low-pass filter

作　　者：张维昭[1] 马胜前[1] 冉兴萍[1] 

机构地区：[1]西北师范大学物理与电子工程学院甘肃省原子分子物理与功能材料重点实验室,甘肃兰州730070

出　　处：《电子技术应用》2011年第7期97-99,共3页Application of Electronic Technique

基　　金：国家自然科学基金项目(20927004)

摘　　要：设计了一种宽频二阶程控低通滤波器。二阶低通滤波电路由模拟乘法器、电流反馈运算放大器、可编程电阻网络及电容构成,充分利用了模拟乘法器和电流反馈运算放大器的优点,并通过主控电路调节数模转换电路的输出电压和低通滤波电路可编程电阻网络的值,实现截止频率程控。该滤波器具有截止频率高、信号处理范围宽、速度高等特点。The paper designs a kind of broadband programmed second-order low-pass filter. The second-order low-pass filter is composed of analog multiplier and current feedback operational amplifier.At the same time, main control unit can control the ouput voltage of A/D circuit and the resistance value of programmable digital resistance network. So the cutoff frequency of filter can be accurately controlled continuously.The filter has features of high cutoff frequency, wide range and high speed of signal processing, and it is suitable for intelligent signal processing.

关 键 词：宽频 程控滤波器 乘法器 电流反馈放大器 

分 类 号：TN713[电子电信—电路与系统]