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1、.摘要本設(shè)計的實現(xiàn)的簡易頻率測試儀中主要包括正交掃頻信號源的設(shè)計、被測網(wǎng)絡(luò)的設(shè)計、信號混合電路的設(shè)計、低通濾波器的設(shè)計以及模數(shù)轉(zhuǎn)換和顯示模塊的設(shè)計。利用直接數(shù)字式頻率合成器AD9854實現(xiàn)正交掃頻信號源的設(shè)計，被測網(wǎng)絡(luò)我們采用LRC諧振電路設(shè)計實現(xiàn)，利用AD835設(shè)計了乘法混合電路，自己利用濾波器設(shè)計軟件設(shè)計了濾波器軟件，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)計中我們及設(shè)計完成了要求完成任務(wù)外，設(shè)計了友好人機(jī)交互接口，實現(xiàn)了頻率可設(shè)置、
2、在實現(xiàn)的過程中不僅能夠改變頻率，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按鍵，設(shè)置了確認(rèn)鍵讓使用者有一個良好的體驗。關(guān)鍵詞：簡易頻率測試儀，AD9854，正交掃頻信號源，C8051f020單片機(jī)..AbstractThedesignofasimplerealizationofthefrequencymeasuringinstrumentmainlyincludesorthogonalfrequencysweepsignalsourcedesign,thetestedne
3、tworkdesign,mixedsignalcircuitdesign,thedesignoflowpassfilterandanalogtodigitalconversionanddisplaymoduledesign.ThedesignofdirectdigitalfrequencysynthesizerAD9854toachieveorthogonalfrequencysweepsignalsource,themeasurednetworkweuseLRCresonantcircuitdesign,themultip
4、licationofmixedcircuitdesignusingAD835,theiruseoffilterdesignsoftwaretodesignfiltersoftware,usingC8051f020singlechipminimizesystemcontrolofhighspeedAD7862analog-to-digitalconversion,finallyshowsthephasefrequencycurvetheamplitudefrequencycurveintheLCDscreen.Thissyst
5、emdesignintheUSandcompletedthedesignrequirementstocompletethetask,friendlyman-machineinterfacedesign,thefrequencycanbesetup,notonlycanchangethefrequencyintheprocessofrealization,indexingandcanchangethefrequencychangevalue,themostimportantiswhetherweareindexingchang
6、efrequencyorfrequencychangevaluesweallusethesamekey,settheconfirmbuttonallowstheusertohaveagoodexperience.ThissystemdesignintheUSandcompletedthedesignrequirementstocompletethetask,friendlyman-machineinterfacedesign,thefrequencycanbesetup,notonlycanchangethefrequenc
7、yintheprocessofrealization,indexingandcanchangethefrequencychangevalue,themostimportantiswhetherweareindexingchangefrequencyorfrequencychangevaluesweallusethesamekey,settheconfirmbuttonallowstheusertohaveagoodexperience.Keyword:Thesimplefrequencytester,AD9854,Ortho
8、gonal?frequencysweepsignalsource,C8051f020system..一、方案論證與比較1.方案的比較與選擇本次設(shè)計的中我們主要考慮正交掃頻信號源的設(shè)計，核心MCU的控制設(shè)計，AD的選擇這三部分。下面就分別對這三部分的方案做以選擇。(1)正交掃頻信號源方案一：
