Design And Realization Of A 500MSPS Data Acquistion Module Based On VXIbus

This paper introduces a 500MSPS data acquisition module based on VXIbus.The module is designed based on high speed A/D conversion and FPGA techniques .High speed data acquisition ,fast data transfer and agile control have been realized with this module.The VXIbus C-size and I,Q channels are employed in this module design,and the sampling rate in each channel reaches 500MHz.The memoty deep of the system is 2MB each channel and CPU is high-speed embedded CPU(PowerPC).The timing and logic function are fulfilled by FPGA.After the disscusion of signal adjusted,the detailed scheme of this module design have been showed.In this design,there is much logic function design,and it is very strict with the hardware language program.So the basic flow of hardware program design and several very important methods of high speed logic function design,which is described by VHDL,areintroduced.Also,expatiated the inner modules structure of FPGA for forepart circuit ,the keystone and difficulties of the design.The design of high-speed PCB is another difficuty of realizing high-speed data acquisition system,and it is very important.The timing simulating results of several pivotal modules are depicted.High-speed signal paths are terminated to match the characteristic impedance.The design undergoes integrity analysis and software simulation. The test results of this module shows that the ENOB is more than 6bits and the SNR is more than 33dB.Also,the test indicates that the system works normally and stably.So hardware design is successful and it can satisfy applications in the field of high-speed digital signal processing.