基于C8051单片机的微弱信号检测装置的设计

设计并制作一套微弱信号检测装置,用以检测在强噪声背景下的频率500Hz～2kHz、幅度值20mV～2V的微弱正弦波信号的幅度值,并通过单片机显示出来该幅度值.当把微弱信号和噪声组成的混合信号输入由MAX262组成的可编程开关电容滤波器时,通过单片机控制该滤波器的中心频率和Q值,从而使该系统适合不同频率的信号输入.通过窄带滤波后可基本恢复原信号,把该信号经过检波和信号调理后输入A/D转换器进行采样,之后将其在LCD 1602上进行显示.

Design of Weak Signal Detection Device

This paper design and make a weak signal detention device,then use it to detect the amplitude value of a weak sine wave frequency（500Hz-2kHz,amplitude：20mV-2V） in a strong noise background and to display the amplitude value through the MCU.When we input the mixed-signal of a weak sine wave and noise to the programmable switched-capacitance filter which composed by MAX262,then we can control the center frequency and Q value to make this system suitable for different frequency signal.And regain the original signal through the narrow-band tilter,then after make this signal pass the detector and signal conditioning input the signal to A/D to sampling,finally,to display the result on the LCD1602.