基于MAX261的程控滤波器

Digital Programmable Filter Based on MAX261

提出了一种以MAX261为核心,结合PIC16F877单片机的程控滤波器的基本原理与实现方案。该程控滤波器由电源电路模块、系统控制及显示模块、放大电路模块、滤波电路模块4个模块构成。对中心频率f0、Q值和工作模式进行编程控制,滤波特性好,实现了截止频率的步进调节要求,可以控制实现信号的放大倍数调节。同时利用LCD液晶显示模块实现程控滤波器性能参数的显示,整个系统性价比比较高,具有很强的实用性。

A kind of basic principle and solution to the programmed wave filter was brought forward, it was based on MAX261 and combined with the PIC16F877 monolithic machine. The programmed control wave filter was made up of four modules, power circuit module, control system and demonstration module, amplyfication module and wave filter power circuit module, which programmed and controlled the process of the f0 and Q factor. The programmed control wave filter, taking advantage of the LCD mode and competitive price was of good quality and good practical value, which can filter waves frequency efficiently, prevent the step-by-step adjustment of frequency and control the amplification adjustment of signals.