Mixer.docx

Mixer.docx

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Mixer

ExperimentReport

CourseName:

CE3510

No.ofexperiments:

4st

Subject:

Mixer

Program:

TEL-0801

ID:

200810016

Name:

jinjieqin

Date:

2011.05.05

JNU-LambtonCollege

PurposeofExperiment:

FamiliarwiththeoperationofADS2008.

Towellknownthemixer’sworkingprinciple.

2.Apparatusused

Personalcomputer

SoftofADS2008

MixerapplicationdesignedADS

3.Dataprocess&principlesofExperiment

Figure1isamicrostripbalancedmixer,thepowerof3dBbranchlinehybridcircuitusingdirectionalcoupler,intheportmatchconditions,1,2asisolatedarm,1to3,4portsandfrom2to34-portpowersplitandphasedifferenceis90°.

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图1

LettheRFsignalandlocaloscillatorportswereaddedfromtheisolated1,2-arm,theinitialphaseis0°,takingintoaccountthesametransmissionpathdoesnotaffecttherelativephaserelationship.Throughthedirectionalcoupler,addedtotheD1,D2onthevoltagesignalandlocaloscillatorare:

VoltageofD1

1-1

1-2

VoltageofD2

1-3

1-4

Canbeseen,thesignalandlocaloscillatorarerespectivelyassignedtothetwodiodephase,itisknownasthetypeofbalancedmixertypemixer.BythegeneralformulaofmixingcurrentandtakingintoaccounttheRFvoltageandphasevoltageoftheoscillatorcanbeobtainedinthemixercurrentofD1:

SimilarlythemixercurrentofD2：

When

，usedtherelationshipof

，weget：

Themaintechnicalindicatorsare:

1,thenoisefactorandtheequivalentphasenoise（singlesidebandnoisefigure,DSBnoisefigure）;

2,theconversiongain,IFoutputandRFinputofthecomparison;

3,dynamicrange,thisisthemixertoworkwhenthemicrowaveinputpowerrange;

4,thedual-bandthird-orderintermodulationandlinearity;

5,theoperatingfrequency;

6,isolation;

7,thelocaloscillatorpowerandoperatingpoint.

Designgoals:

RF:

3.6GHz,LO:

3.8GHz,noise:

<15.

2.thespecificdesignprocess

2.1CreatingaNewProject

◇startADS

◇SelectMainwindows

◇Menu-File-NewProject,thenfollowthepromptstoselecttheprojectpathandsavetheinputfilename

◇click"ok"Thiswillcreateanewproject.

Press朗读

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pressppr

，Createanewschematicwindow,andbegantodesignmixer.

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◇

◇

◇

◇

◇

◇

◇

◇2.23dBdirectionalcoupler“Tlines-Microstrip”

◇choose

，changedtheparameters，

◇，

◇Thisisamicrostripsubstrateparameters,includingthephysicalmeaning,canrefertotheADSwiththehelpofdocumentation.

Choice,whichisamicrostriptransmissionline,choose,thisisaSanchakou.

Gooddesignaccordingtothefollowingschematicdiagram

Figure23dBcoupler

One50ohmtransmissionlinewidthw=0.98mm,aquarterwavelengthlengthof10.46mm,35ohmtransmissionlinewidthisw=1.67mm,aquarterwavelengthlengthof10.2mm.MTEEisathree-portdevice,therearethreeparametersW1,W2,W3arespecificallydefined,canhelpdocumentthereferenceADS.

SelectCategory"Simulation-S_Param"andtheemulatorandthe"Term"pu

t

图3

◇Doubletouched

，changedtheparametersfrom3GHzto5GHzscaned。

。

◇Savedit。

◇press“F7”tostart。

◇At“DataDisplay”windows，press

，Asshownbelow,lookatthecouplingport。

图4

Resultasshowbelow:

Figure5,thephasedifferencebetweenoutputports

Thesamewayyoucanseethephasedifferenceoutputport,inputportisolation,inputreturnlossandsoon.

Figure6,thephasedifferenceoutput

Figure7,inputportreturnloss

F

Figure8inputandoutputportisolation

ConclusionandDisscusion:

Thisisamicrostripbalancedmixerismainlycomposedofseveralparts:

3dBdirectionalcoupler,thediodeinputandoutputimpedancematchingcircuit,twodiodes,theoutputlow-passfilter.Inthisarticle,wefirstintroducethe3dBdirectionalcouplersimulation,someofwhichcanrefertootherinformationtheory,toknowtheprinciples,youcanusesoftwaretocalculateanumberofsmallwidth,thesoftwarewheresometeachersChanantibiotics.Followedbytheintroductionofalow-passfilterdesignandsimulation,itisrelativelysimplefortheoutputofIFfilter.Followedbydesignandsimulation,respectively,thespectrumofthisMixer,noise,gain-powercurveoftheoscillator,theRFfrequency-thenoisefactorcurveandsoon.Throughouttheprocess,thecircuitschematicarethesame,changeonlytheportconfiguration,theconfigurationoftheemulatorthereisavariableconfiguration.Severaloflaw.MixerfortheHBSimulationtosimulateaportisrequiredRFinputport,2portisIFinputport,3portistheLOinputport.Enterthepartofthegeneraluseofthepowersource,theoutputloadistousethe"Term".