摘要
以AT89S52单片机作为控制核心,设计一个高性能的程控滤波器。放大电路采用由单片机AT89S52、DAC0832和集成运放组成的程控放大电路,可实现对放大器增益的设置,同时实现增益的步进可调,增益变化范围为0～60 dB;显示部分采用OCM2×16字符点阵系列模块,以实现设置参数显示功能;低通选用二阶低通贝赛尔滤波电路,高通采用压控二阶高通滤波电路,选用X9312数字电位器来控制截止频率f_0在1～20 kHz可调。经实验调试,较好地实现了预定的功能,系统的可靠性和性价比较高。
The system AT89S52 as the control core,designe a high-performance programmable filter.Amplifier circuit compose of AT89S52,DAC0832 and integrated op-amp amplifier circuit program control.It realize on the amplifier gain settings,and achieve the gain-step adjustment from 0 dB to 60 dB.LCD module using the OCM2×16 of dot-matrix characters display the setting parameters.Low-pass filter use low-pass Bessel filter circuit.High-pass filter use voltae-controlled voltage source second-order high-pass filter circuit.Using X9312 digital potentiometer controlle cut-off frequency from 1 kHz to 20 kHz.The experiment to debug the system to better achieve predetermined functions.The higher system reliability and cost-effective.
出处
《国外电子测量技术》
2010年第3期39-44,共6页
Foreign Electronic Measurement Technology
