基于STM32的多功能滤波器系统设计

Design of Multifunctional Filter System Based on STM32

为了解决传统滤波器功能单一、结构固定不可调节且对弱信号响应能力不足等问题,设计了一种多功能滤波器.该滤波器以STM32为控制核心,采用高精度仪表放大器和有源滤波器,实现了在较宽频带内对弱信号的放大和滤波功能.结果表明,该滤波器具有较高的电压增益与通频带宽,同时具有低通、高通、带通及陷波等滤波功能,增益与截止频率、中心频率及陷波频率步进可调,且误差低于3%.系统整体结构紧凑,稳定性强,具有良好的人机交互界面,可应用于各类滤波场合.

In order to solve the problems of the general filter,such as single function,fixed structure,unadjustable and inadequate response to weak signals,a multifunctional filter was designed.The filter adopted STM32 as the control core,and used high-precision instrument amplifier and active filter.It could amplify and filter weak signals in a wide band.The results show that the filter has high voltage gain and passband width,and has the filtering functions of low pass,high pass,band pass and notch.The gain and cutoff frequency,center frequency and notch frequency can be adjusted step by step,with less than 3% errors.The whole system has advantages of compact structure,strong stability and good man-machine interaction interface,which can be applied in various filtering occasions.