基于fpga的dds信号发生器的分析与设计word格式论文.docxVIP

摘要摘要直接数字频率合成（DDS）与传统的频率合成技术相比，具有频率分辨率高，速度快，易于集成等优点，在很大程度上满足了现代电子系统的许多要求，因此在通信设备、电子仪器等领域中得到了广泛的应用。FPGA的优良特性为DDS技术提供了更加先进的技术手段。本文基于DDS原理，利用FPGA技术开发了多波形信号发生器的硬件平台和软件平台。信号发生器的波形数据存储方式采用顺序存储，首先对所有的需要输出信号波形分别提取数据，然后将取样数据依次全部存储在ROM波形表里，通过外围设备拨扭开关选择需要输出的信号波形，利用矩阵键盘设定信号的输出频率，最终将波形信息显示在LCD液晶显示屏上。本设计所选用的实验平台是博创SOPC_2000 嵌入式实验箱，开发平台上的由Altera公司生产的Cyclone II系列FPGA芯片EP2C35F672C8是构建DDS 信号发生器的核心芯片。本设计同时采用原理图输入方式和硬件描述语言Verilog编写用户自定义逻辑，利用SOPCBuilder 开发软件构建系统模块，各硬件模块之间的协调工作是通过嵌入式软核处理器Nios Ⅱ用编程实现控制。采用FPGA软硬件可编程协同设计技术，使得DDS电路在灵活性，可行性，精确性等方面得到了很大提高。关键字DDSFPGA技术顺序存储Nios ⅡAbstractAbstractComparedwiththetraditionalfrequencysynthesizertechnology,thedirectdigital synthesis(DDS)withhighfrequencyresolution,speedandeaseofintegration,largelymeets manyrequirementsofmodernelectronicsystems.Therefore,ithasbeenwidelyappliedinthe fieldofcommunicationequipment,electronicinstrumentsandsoon.Excellentcharacteristics for FPGAprovide more advanced technical means for DDS technology.ThethesisisbasedontheDDStheory.WeuseFPGAtechnologytodeveloptheplatform ofhardwareandsoftwareofamulti-waveformsignalgenerator.Weusesequentialmeansto storethewaveformdataofthesignalgenerator.First,weneedtoextractdataofallsignal waveforms to export. And then,we store all sampling data in the waveform table of ROM.We selecttheoutputsignalwaveformsviatheperipheraldialswitchsandusethematrix keyboardtosetthefrequencyofthesignals.Finally,thewaveforminformationwillbe displayed on the LCD.Borch SOPC_2000 embedded test unit is the experimental platform we chooseforthedesign.TheFPGAchipofEP2C35F672C8ofCycloneIImanufacturedby AlteraCorporationisthecoreoftheDDSsignalgeneratoronthedevelopmentplatform.We usethewayofschematicentryandthelanguageofVerilogtodescripehardwaretowrite user-definedlogic.The systemmodule is built by the softwareof SOPC Builder. Coordination betweenthevarioushardwaremodulesiscontrolledbytheprocessorofembeddedsoft-core ofNiosII.Theprogrammableandcollaborativetechnologyofthehardwareandsoftwareof FPGAforthedesignweuse,greatly