基于FPGA的高精度电磁信号采集系统设计

摘要

In order to meet the need of transient electromagnetic exploration,a high precision digital recorder mainly made by the high performance 24 bit A/D chipset AD7762 and logic control core FPGA is introduced.The high-speed data channel is built between FPGA and PC through applying the chip CY7C68013-A as the USB2.0 interface chip.PC used LabVIEW as a development platform to complete data display and analysis function.Test results indicated that the system has good performance,scalability and accurate,which meets the needs of data acquisition of electromagnetic exploration.%为了满足瞬变电磁探测中晚期电磁信号采集的要求,选择高性能24位模数转换器AD7762,以FPGA为控制核心实现信号的高精度采集,结合USB2.0接口芯片CY7C68013-A,将采集的数据高速传输至上位机,上位机采用LabVIEW作为开发平台,完成数据显示和分析功能.实验结果表明,基于FPGA的电磁信号采集系统具有良好的性能指标和扩展性,测量准确,能够满足电磁探测数据采集的要求.