应用MAX264设计程控滤波器  

Programmed control filter based on MAX264

作　　者：陈世夏[1] 李树峰[1] 戚甫峰 桑巧莲[1] 韩丹涛[1] 

机构地区：[1]海军航空工程学院青岛分院航空电子系,青岛266041

出　　处：《电子测量技术》2008年第4期171-174,共4页Electronic Measurement Technology

摘　　要：本设计应用集成芯片MAX264设计一个程控滤波器。该滤波器主要由3个模块组成:前置放大、滤波电路、单片机显示与控制电路等。前置放大采用集成运放AD620构成;滤波器采用MAX264。然后利用单片机对MAX264编程,实现低通、高通及椭圆滤波器。通过测试达到了以下要求:输入正弦电压振幅为10mV时,总增益为40dB,通频带为100Hz～40kHz,;低通和高通滤波器,其-3dB截止频率fc在1～20kHz范围内可调,频率步进为1kHz,低通在2fc处总电压增益不大于30dB;高通在0.5fc处总电压增益不大于30dB;四阶椭圆型低通滤波器,带内起伏≤1dB,-3dB通带为50kHz,-3dB通带误差不大于5%。This design of circuit is composed by 3 modules： a prime amplifier, a filter and the circuit of MCU display and control. In the preamplifier circuit, the small signal-amplifier is composed by proportional operational circuit of integrated amplifier AD620. The gain can be changed through adjusting the feedback-resistor. The filter-circuit consists of MAX integrated amplifier. The high pass and low pass and ellipse-filter are realized by the medium of the MAX264＇s programming. The MCU is able to control the display and data processing model.

关 键 词：放大器 高通 低通 程控滤波 

分 类 号：TH866.3[机械工程—仪器科学与技术]