目 录 引言···························································1 1 FPGA和VHDL概述·············································1 FPGA发展历程·················································1 VHDL语言介绍·················································3 2 多通道采样系统的组成········································3 3 总体方案设计与论证··········································4 3.1 方案设计·····················································4 3.1.1方案一·····················································4 3.1.2方案二·····················································4 3.1.3方案三·····················································4 3.2方案比较·····················································4 4 单元电路的设计··············································5 4.1音频放大、滤波部分············································5 4.1.1音频放大部分················································5 4.1.2有源滤波器的设计·············································6 4.2 AD采样电路···················································8 4.2.1芯片介绍····················································8 4.2.2芯片应用···················································11 4.3 FPGA控制部分·················································11 4.3.1通道选择模块···············································11 4.3.2 AD7892控制部分·············································12 4.3.3延时模块的设计·············································17 4.3.4串并输出选择控制············································18 4.3.5 FIFO模块··················································18 4.3.6 AD采样系统顶层电路设计······································19 4.4 FPGA的硬件设计··············································20 4.4.1 EP1K30TC144-3芯片介绍·······································20 4.4.2芯片组成描述···············································20 4.4.3芯片工作电压设计············································21 4.4.4芯片配置介绍···············································22 4.4.5电路设计注意事项············································24 4.4.6硬件电路设计技巧············································25 5 软件介绍···················································25 5.1 MAX+PlusⅡ··················································25 5.2Electronics Workbench(EWB) ····································25 5.3Protel99SE···················································26 6 整机调试···················································26 6.1 硬件电路的调试步骤···········································26 6.1.1音频放大部分调试············································26 6.1.2滤波部分调试···············································27 6.1.3LM317稳压块调试·············································27 6.1.4FPGA硬件电路调试············································27 6.1.5AD采样模块调试··············································28 6.2 联机调试····················································28 6.3调试注意事项·················································28 7 结论·······················································29 谢辞··························································30 参考文献······················································31 附录··························································32
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