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传统的数据采集系统,通常采用单片机或DSP作为主要控制模块,控制ADC,存储器和其他外围电路的工作。随着数据采集对速度性能的要求越来越高,传统采集系统的弊端就越来越明显。单片机的时钟频率较低且需用软件实现数据采集,这使得采集速度和效率降低,此外软件运行时间在整个采样时间中也占很大比例,而FPGA有单片机无法比拟的优势。FPGA时钟频率高内部时延小,全部控制逻辑由硬件完成,速度快,效率高[1]。数字信号处理是以数字形式对信号进行采集,变换,滤波估值,增强,压缩,识别等处理,从而得到符合需要的信号形式。而信号的处理目前有两种方式:使用信号处理器DSP通过软件编程实现;应用FPGA实现。利用软件编程虽然有很大的灵活性,但DSP所有指令的执行时间均为单周期,而且受到串行指令流的限制每个时钟周期所有的操作数有限难以实现高速大规模运算。现在大容量,高速度的FPGA采用硬件描述语言VHDL实现整个系统,允许设计人员利用并行处理技术实现高速信号处理算法并只需单个处理器就能通过模块化设计实现所期望的性能,很好的解决了上述矛盾。趋势:随着便携式设备需求的增长,对FPGA的低压,低功耗的要求日益迫切,芯片向大规模系统芯片靠近,力求在大规模应用中取代ASIC,位增强市场竞争力,各大厂商都在积极推广其知识产权和核心库,动态课重构技术的发展将带来系统设计方法的转变[2]。
FISHER CONTROLS DH7201X1-A3
FISHER CONTROLS DH7202X1-A1
FISHER CONTROLS DM-6001
FISHER CONTROLS DM6001X1
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FISHER CONTROLS 10P53330001
FISHER CONTROLS 120556X152
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FISHER CONTROLS 12P1509X092
FISHER CONTROLS 275
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