資源描述：
《2013年簡(jiǎn)易頻率特性測(cè)試儀》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、摘要本設(shè)計(jì)的實(shí)現(xiàn)的簡(jiǎn)易頻率測(cè)試儀中主要包括正交掃頻信號(hào)源的設(shè)計(jì)、被測(cè)網(wǎng)絡(luò)的設(shè)計(jì)、信號(hào)混合電路的設(shè)計(jì)、低通濾波器的設(shè)計(jì)以及模數(shù)轉(zhuǎn)換和顯示模塊的設(shè)計(jì)。利用直接數(shù)字式頻率合成器AD9854實(shí)現(xiàn)正交掃頻信號(hào)源的設(shè)計(jì)，被測(cè)網(wǎng)絡(luò)我們采用LRC諧振電路設(shè)計(jì)實(shí)現(xiàn)，利用AD835設(shè)計(jì)了乘法混合電路，自己利用濾波器設(shè)計(jì)軟件設(shè)計(jì)了濾波器軟件，利用C8051f020單片機(jī)最小系統(tǒng)控制高速AD7862完成模數(shù)的轉(zhuǎn)換，最后在LCD屏上顯示得到的相頻曲線和幅頻曲線。本系統(tǒng)中設(shè)計(jì)中我們及設(shè)計(jì)完成了要求完成任務(wù)外，設(shè)計(jì)了友好人機(jī)交互接口，實(shí)現(xiàn)了頻率可設(shè)置、在實(shí)現(xiàn)的過程中不僅能夠改變頻率，
2、而且可以改變頻率改變的分度值，最重要的是我們不論是改變頻率還是頻率改變的分度值我們都使用了同一個(gè)按鍵，設(shè)置了確認(rèn)鍵讓使用者有一個(gè)良好的體驗(yàn)。關(guān)鍵詞：簡(jiǎn)易頻率測(cè)試儀，AD9854，正交掃頻信號(hào)源，C8051f020單片機(jī)AbstractThedesignofasimplerealizationofthefrequencymeasuringinstrumentmainlyincludesorthogonalfrequencysweepsignalsourcedesign,thetestednetworkdesign,mixedsignalcircuitdes
3、ign,thedesignoflowpassfilterandanalogtodigitalconversionanddisplaymoduledesign.ThedesignofdirectdigitalfrequencysynthesizerAD9854toachieveorthogonalfrequencysweepsignalsource,themeasurednetworkweuseLRCresonantcircuitdesign,themultiplicationofmixedcircuitdesignusingAD835,theiruseo
4、ffilterdesignsoftwaretodesignfiltersoftware,usingC8051f020singlechipminimizesystemcontrolofhighspeedAD7862analog-to-digitalconversion,finallyshowsthephasefrequencycurvetheamplitudefrequencycurveintheLCDscreen.ThissystemdesignintheUSandcompletedthedesignrequirementstocompletetheta
5、sk,friendlyman-machineinterfacedesign,thefrequencycanbesetup,notonlycanchangethefrequencyintheprocessofrealization,indexingandcanchangethefrequencychangevalue,themostimportantiswhetherweareindexingchangefrequencyorfrequencychangevaluesweallusethesamekey,settheconfirmbuttonallowst
6、heusertohaveagoodexperience.ThissystemdesignintheUSandcompletedthedesignrequirementstocompletethetask,friendlyman-machineinterfacedesign,thefrequencycanbesetup,notonlycanchangethefrequencyintheprocessofrealization,indexingandcanchangethefrequencychangevalue,themostimportantiswhet
7、herweareindexingchangefrequencyorfrequencychangevaluesweallusethesamekey,settheconfirmbuttonallowstheusertohaveagoodexperience.Keyword:Thesimplefrequencytester,AD9854,Orthogonal?frequencysweepsignalsource,C8051f020systemI一、方案論證與比較1.方案的比較與選擇本次設(shè)計(jì)的中我們主要考慮正交掃頻信號(hào)源的設(shè)計(jì)，核心MCU的控制設(shè)計(jì)，AD的選擇這
8、三部分。下面就分別對(duì)這三部分的方案做以選擇。(1)正交掃頻信號(hào)源方案一：我們可以
