In order to realize real-time acquisition and display of analog signals output by micro sensor

a microsensor signal acquisition system based on field programmable gate array（ FPGA） is proposed. The system is composed of a FPGA

a 24 bit high-precision analog-to-digital（ A/D） converter ADS1256 and a host computer.FPGA is used acts as the the controller of the system. The general input/output（ I/O） port of FPGA is programmed by Verilog language to simulate the signal timing of serial perpheral interface（ SPI） bus

and complete the read-write operation control of the ADS1256. By using RS—232 serial communication

the sampled data is transported to the host computer developed in Visual C + + developing environment

and the functions of real-time acquisition

display and data storage of the analog signal of the micro sensors are finally realized. The precision of the acquisition system is tested by acquiring the standard direct current（ DC） voltage signal

and the error is less than 0. 03 %.