摘要
针对空气离子的不稳定性,设计了一种抗干扰能力强的程控增益微电流放大电路系统,包括I-V转换电路、前置放大电路和低通滤波电路。系统采用STM32实现对数字电位器及继电器的自动控制,根据空气离子浓度的变换来自动调节增益,从而得到最佳的AD转换量程,最终精确得出空气离子浓度值。
Aimed at air ion instability,this paper designed a kind of micro-current amplifier circuit system.The system has stronger capacity of resisting disturbance.It was controlled by program.It included I-V conversion circuit,amplifier circuit and a low-pass filter circuit.It used STM32 to acheieve the contorl of digital potentiometer and relay.According to the air ion concentration,STM32 can automatically adjust the gain of operational amplifier.Then it will get the optimal AD conversion range.Finally it precisely get that air ion concentration value.
出处
《仪表技术与传感器》
CSCD
北大核心
2013年第3期64-65,68,共3页
Instrument Technique and Sensor
关键词
程控增益
微电流
前置放大电路
低通滤波电路
gain controllable
micro-current
amplifier circuit
low-pass filter circuit
