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1、AndyHoward ApplicationsEngineer 28May,2002LoadPullSimulationUsingADSOutlineOverviewSpecifyingandgeneratingdesiredloadreflectioncoefficientsAssigningarbitraryreflectioncoefficientsattheharmonicfreqs.BiasingthedeviceandrunningasimulationCalculatingdesiredresponses(deliveredpower,
2、PAE,etc.)GeneratingcontourlinesLoadpullsimulationvariestheloadreflectioncoefficientpresentedtoadevice...VaryloadreflectioncoefficientLoadPullSimulationUsingADS28May,20023…tofindtheoptimalvaluetomaximizepowerorPAE,etc.LoadPullSimulationUsingADS28May,20024Specifytheloadreflection
3、coefficientsSimulationsetupiscomplicated,butregionissampledmoreuniformlySimulationsetupistrivialLoadPullSimulationUsingADS28May,20025SweepingrhooveracircularregionSpecifycircularregion,vias11_rhoands11_centervariablesThisisjustastaticfigure.Itdoesnotgetupdatednorcorrespondtothe
4、valuesintheequations.RadiusofcircleCenterofcircleLoadPullSimulationUsingADS28May,20026UseReflectionCoefUtilitydatadisplaytohelpsets11_centerands11_rhoThecirclecenterandradiusareupdatedwhenyoumoveeitherorbothofthemarkersLoadPullSimulationUsingADS28May,20027Twovariablesaresweptto
5、generatethepointswithinthedesiredcircleTheseinitializethesweptvariablesindexs11isthereflectioncoefficientWillexplainStartandStopequationslaterLoadPullSimulationUsingADS28May,20028MoreonthesweptvariablesVariable“imag_indexs11”isthey-axisvalueofsimulatedreflectioncoefficient.Vari
6、able“real_indexs11”isthex-axisvalue.Theimag_indexs11variableissteppeduniformly,whereasreal_indexs11issteppednon-uniformly.Eachpointisadatapair:(real_indexs11,imag_indexs11)m3isatapproximately:(-0.706,0.386)LoadPullSimulationUsingADS28May,20029Sweeplimitsfor“imag_indexs11”Arrowp
7、ointstos11_centerimag(s11_center)ABDistance“A”=Distance“B”=max_rho-max_rho/(lines+1)LoadPullSimulationUsingADS28May,200210Whatis“max_rho”?LengthofvectorC=mag(s11_center)CDLengthofvectorD=1-mag(s11_center)Themax_rhoequationreducestheradiusofthecircleofsimulatedreflectioncoeffici
8、entsifanypartofthecirclewouldotherwisebeoutsidetheSmit
