毕业论文简易频谱分析仪的设计.doc
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毕业论文简易频谱分析仪的设计.doc
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摘要
频谱分析仪的基本功能是测量信号的幅度/频率响应,可以完成诸如频谱成分分析、失真测量、调制信号谱分析、信号衰减测量、电子组件增益测量等。
其基本工作原理是,扫频本振的频率随锯齿波发生器的输出在一定范围内扫描,使不同频率的输入信号与本振混频后,依次落入分辨率带宽滤波器通带内,进一步放大、检波后加到Y放大器,亮点在屏幕上的垂直偏移正比于该频率分量的幅值。
由于扫描电压在调制振荡器的同时,又驱动X放大器,从而可以在屏幕上显示出被子测信号的频谱。
本系统是根据外差原理设计并实现的频谱分析仪。
利用DDS芯片生成10KHZ步进的本机振荡器,AD835做混频器实现频率的合成,通过滤波器取出各个频点(相隔10KHZ)的值,再配合放大,检波电路收集采样值,经单片机SPCE061A处理,最后送给示波器显示频谱。
测量频率范围覆盖1—30MHZ,该系统也可以根据用户的需要设定显示频谱的中心频率和带宽,还可以识别调幅,调频和等幅波信号。
关键词频谱分析,混频,滤波,外差原理
Abstract
Spectrumanalyzertomeasurethesignalisthebasicfunctionoftheamplitude/frequencyresponsecanbefinishedsuchasspectrumcompositionanalysis,distortionmeasuring,modulationsignalspectrumanalysis,signalattenuationmeasure,electroniccomponentgainmeasurements.Basicworkingprincipleis,sweepfrequencythisthevibrationofthefrequencywiththeoutputofsawtoothwavegeneratorinacertainrangeofdifferentfrequencyscanning,maketheinputsignalandtheresonancefrequencymixing,ordinalfallwithinbandpassfilterbandwidthresolution,furtheramplification,afterdetectionofamplifier,highlightsaddedtoYinscreenisproportionaltotheverticalmigrationoftheamplitudefrequencycomponents.Duetoscanvoltageinmodulationoscillator,andmeanwhile,thuscandriveXamplifierisshownonthescreeninthespectrumofthemeasuredsignalquilt.
Thispaperadoptsheterodyneprincipledesignandrealizethespectrumanalyzer.Use10KHZDDSchipgenerationstepofthismachineoscillators,AD835domixers,throughthefilterremoveeachfrequency(10KHZ)valueapart,coupledwithamplifier,detectioncircuittocollectsamplesvaluesofsunplusSPCE061AprocessingbyMCU,finallysendoscilloscopedisplayspectrum.Measurefrequencyrangecovers1-30MHZaccordingtouserneedtosetthedisplayspectrumofcenterfrequencyandbandwidth,stillcanidentifyam,FMandamplitudewavesignal.
KEYWORDSSpectralanalysis,mixing,smoothing,heterodyneprinciple
11.Haveagoodrest.Ihopeyoufeelb____________soon.
12.Helooksa_____________.Whatdidyousaytohim?
13.Ifyouhaveat_______________,youshouldseeadentist.
14.Don’tthinkmuchofther_____________oftheexam.
15.Youmustlooka_____________yourhealth.
16.Thedoctorsaid,“Openyourm____________andsayAh…”
17.Shehasaf____________.Sheshoulddrinklotsofwater.
18.Chinesedoctorsb_____________weneedabalanceofyinandyangtobehealthy.
19.Heist_______________.Hewantstohavesomewater.
20.---CanIhavealookatyourphotos?
----Yes,ofc_____________.
三、用括号内所给的词的正确形式填空(10分).
21.My_______________lifestylehelpsmegetgoodgrades.(health)
22.Heiskindofunhealthy.He_______________everexercises.(hard)
23.Youshould____________somehotteawithhoney.(drink)
24.Youlooktoo_____________out.Trytorelaxyourself.(stress)
25.Chinesemedicineispopularinmany_______________countries.(west)
26.Mom____________metoeatmorevegetables.(want)
27.Aliceistiredandhasalotof_______________.(head)
28.Youmusttrytoeat_______________meatandexerciseeveryday.(little)
29.Acathasfour_____________.(foot)
30.Whatabout_____________everymorning?
(run)
四、情景交际(每小题1分,共15分)
第I条根据对话内容与上下文,完成对话,每空填一词,缩写算一个词。
A:
Hello.I’ma_______________(31)fromCCTV’sHealthyLivingShow.Canyouhelpme?
B:
________________(32).
A:
MayIaskyousome__________________(33)aboutyourlife?
B:
Idon’t_________________(34).Youcanaskmeanythingyouwant.
A:
Youlookfit(强壮的).Doyou__________________(35)everyday?
B:
Yes.IgorunningeverymorningandthenIcookgoodbreakfast.
A:
That’sgood.How_______________(36)doyoueatfruit?
B:
______________(37)aday.Iusuallyeatfruitforbreakfastanddinner.
A:
Whataboutvegetables?
B:
Ieatvegetableseveryday.ButIdon’tlikeeatingcarrots.Ican’t______________(38)them.Theyareawful.
A:
Really?
Idon’tlikecarrots,either.Doyouofteneatjunkfood,suchaschocolate,potatochipsandsoon?
B:
No,Ihardlyevereatit.It’s________________(39)goodforhealth.
A:
NowIknowwhyyouarefit.Youhaveagoodlivinghabit.Thankyoufor______________(40)
meverymuch.
(B)从方框中选择适当的句子填空,补全对话。
A:
Mum,_____(41)
B:
What’sthematterwithyou?
A:
_____(42)
B:
_____(43)
A:
Aboutonehourago.
B:
Whatdidyoueatforbreakfast?
A:
_____(44)
B:
Anapple?
Nomore?
A:
Nomore.
B:
Oh!
_____(45)Youshouldhavesomeporridge.
五、根据中文意思,完成下列句子,每空填一词,缩写算一个词。
(每小题1分,共10分)
46.关于说英语,有些学生说得挺好。
____________________speakingEnglish,somestudentsspeakwell.
47.你怎么了?
我背疼。
What’sthematterwithyou?
Ihavea____________________.
48.我们可以一周练习一两次钢琴。
Wecanpracticethe
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