摘要
系统以MSP430为主控制芯片,实施对微弱信号输出的AD采样,并借助1602液晶将结果显示以提高人性化的操作。对于微弱信号及噪声源的处理,主要是使用反相求和比例运算器、Ⅱ型纯电阻衰减网络、射极跟随器、选频放大网络及精密整流路来组成信号检测电路,从而将稳定的直流信号输出给MSP430主控芯片。当输入正弦波信号VS的频率在100Hz-10kHz范围内、幅度峰峰值在20mV-200mV范围内时,以上模块可检测并显示正弦波信号的幅度值,且误差不超过5%。
The system is based on MSP430 and it can sample the weak signal,which can show the results to improve human＇s operation by using 1602 LCD.It uses inverse proportion sum unit, pure resistance attenuation network,emitter follower, frequency selective amplification network and precision rectifier circuit to stabilize output to the dc signal,which will be transferred to MSP430.When the input sine wave signal Vs＇s frequency is between 100Hz and 10kHz,amplitude peak value is between 20 mv to 200 mv range,the above module can detect and display sine wave signal amplitude value,whose error is under 5%
出处
《现代科学仪器》
2013年第5期87-90,共4页
Modern Scientific Instruments
关键词
微弱信号检测
衰减网络
选频放大
精密整流
Weak signal detection
Attenuation network
Frequency selective
Amplification precision rectification
