Development Of High-speed Data Acquisition System Based On FPGA

Along with the fast development of microelectronic technology and computer technology, the digitization of continuous analog signal has been applied to the scientific research, production and living field, and also the data acquisition and process system based on it is applied widely. Because the requirement of performance data acquisition and process system is increasing, it is becoming very popular that has higher accuracy and speed of collecting data.In this paper, I design a high-speed data acquisition system. The system bases on the FPGA performance of high-speed, high density, high systemic stability effectively reducing device size and flexible design. Firstly, I use FPGA as the system core of control and process. Secondly, I finish the storage and transmission of the A/D convert data. Finally, using USB2.0 sends data to computer for processing, analysis and display.The proposed design scheme of high-speed data acquisition system can be divided into hardware design and software design. The systemic hardware circuit design mainly includes power supply circuit, FIFO storage circuit, A/D sampling circuit, A/D cconditioning circuit and USB interface circuit. In each module circuit, I have completed module circuit analysis, schematic design, hardware design and debugging. In the system software design,Using VHDL language has completed the FPGA sequential control. The computer interface is designed by LabVIEW software. Based on the top-down design method of VHDL language, the divided modules completes the FPGA logic function. I use the LabVIEW graphical programming language to design human-machine interface for receiving and displaying the collecting data.Finally, I combine the hardware with software to realize the complete high-speed data acquisition system, and then carry out the systemic debugging. By the test case, it shows that the system accords with design target in acquisition speed and accuracy. The system is small size, easy to take, can be applied in industry measurement and control, communication, medical and signal processing field, has the very high performance-to-price ratio and the widespread application prospect.