小信号处理电路的设计与实现

he real-time signal capture， processing and transmission are widely used inindustry control，automotive industry and transportation industry.The accuracy requirements of the signal processing getting higher and higher.As the representative of Micro-signal processing，this paper presents a circuit to acquisition，precision conditioning and enlarge，analog to digital transfer and the real-time transmission the signal from the thermistor pt100.The design of the constant current source，conditioning and enlarge，analog to digital transfer，transmission and display model have gived in this paper.the design of the process model have been introduced in detail. This design are focused on the accurate of signal processing，real-time of transmission and anti-electromagnetic interface. This circuit can work well in high temperature and electromagnetic interface.It is evidenced that the design are work Reliability in dickly environment and suit for the marine Diesel engine system，industrial contron and so on.