Portable data acquisition system based on FPGA and USB

Nowadays, along with the development of technology of the high-speed Analog to Digital Converter (ADC) and Field Programmable Gate Array (FPGA), the design and the implementation of high-speed and highaccuracy data acquisition system is also becoming economic and feasible. In this paper, we designed a high-speed, high-precision, portable data acquisition and processing system in Altera Corporation cyclone II FPGA platform, and achieved the communication between the system and PC via USB2.0 interface. The whole system is divided into four parts: the A/D module, the FPGA module, the USB module and the LABVIEW (Laboratory Virtual Instrument Engineering Workbench) module. We used AD9467 as the core chip of the A/D module, and the characteristics and specific circuit design of AD9467 are explained in detail; the FPGA module is the core of the entire system, which is not only the center of the signal conditioning but also the control center to ensure the whole system to work in an orderly manner. We also introduced the concrete realization of the design of clock part, LVDS converter module and USB control module. The programming language used verilog hardware description language. And then we introduced the design of the USB module in detail where the Lab VIEW module was the module of human-computer interaction that introduced the concrete realization of the PC display software using G language. Finally, we debugged and tested the entire system, the results show that the design can work very well and meet the requirements of the system design.