81110A脉冲式发生器

KeysightTechnologies

81110A脉冲/模式发生器系列

TechnicalOverview

Version2.0

Introduction

ThisproductnotedescribeshowR&DengineersinthecommunicationindustryuseKeysightTechnologies,Inc.pulsegeneratorsforthedevelopmentofvideointerfacesforprojectionunits.

SeveraldatacommunicationcompaniesdevelopinterfacesbetweenLocalClockOscillators(LCOs)andvideo,TV,orcomputersforoverheadprojectionunits.Itisveryimportantforthemtostay

up-to-datewiththerapidlychangingvideointerfacesincomputers,andtohavetestequipmentthatcansimulatethesedifferentinterfaces(suchasHDTVinterfaces).Theseinterfacesvaryfrom33MHzto80MHz.

Acriticalindicatorofthequalityoftheirdesignisitssensitivitytoajitteringdistributedclocksignal,bothinfrequencyandamplitude.

03|Keysight|81100FamilyofPulse/PatternGenerators-TechnicalOverview

RequiredequipmentforLab2

1xpulse/patterngenerator(81150Aor81160A)

1xInfiniiumoscilloscope

4xBNCcables

Howtohookuptheinstruments

Connectstrobeout2(pulse/patterngenerator)tochannel3(scope).

Connectoutput1(pulse/patterngenerator)tochannel1(scope).

Connectoutput2(pulse/patterngenerator)tochannel2(scope).

Connecttriggerout2(pulse/patterngenerator)tochannel4(scope).

4

2

3

1

Figure1.ThesetupofaKeysightpulsegeneratorandInfiniiumoscilloscope

IdealH-sync

DistortedH-sync

Jitteringpulse

Figure2.Jitteringdistributedclocksignal

04|Keysight|81100FamilyofPulse/PatternGenerators-TechnicalOverview

DistortedH-sync

Channel1

+

Channel2

Tosimulatejitteringsynchronizationsignalswithapulsegenerator,

weneed:

Twooutputchannelswithchanneladdition

Figure3.

DistortedH-sync

Channel1

+

Channel2

Programmablebitpatternsupto90MHzfrequency

90MHz

1

0

1

0

0

0

1

0

0

0

0

0

1

0

0

0

Figure4.

DistortedH-sync

Channel1

Level1

+

Level2

Channel2

Delay

Variabledelayandvariablelevel

Followthestepsonthenextpagestosetupthecorrectparametervaluesonthefrontpanel.Thenreviewthepulsesontheoscilloscope.

Figure5.

05|Keysight|81100FamilyofPulse/PatternGenerators-TechnicalOverview

STEP1.First,resettheinstrumentbypushingStore/Recallandselecting‘Settodefault”.

STEP2.Enable‘Continuoustriggermode’(select‘cont’)andselect‘PulseWaveform’(‘Pulse’)forchannel1andchannel2.

STEP3.Setchannel1,asshowninFigure6.

Frequency:90MHz

Dutycycle:50%

LeadE:5ns

High:1V

Low:0V

Figure6.Step3.

STEP4.Setchannel2,asshowninFigure7.

Frequency:90MHz

Dutycycle:50%

LeadE:5ns

High:950mV

Low:0V

Figure7.Step4.

STEP5.Choosechannel1;select‘patternmode,’andpush‘EditPattern’tocreateanewchannel.

Figure8.Step5.

06|Keysight|81100FamilyofPulse/PatternGenerators-TechnicalOverview

STEP6.Thenumberofbitsare8.Setthebitsbystartingwiththelastbit.

Note:Patternis10100010.

STEP7.Performsteps5and6for

channel2.

Note:Patternis00001000.

Figure9.Step6.

Figure10.Step7.

STEP8.Reviewthesignalsonchannels1and2.

Figure11.Step8.

07|Keysight|81100FamilyofPulse/PatternGenerators-TechnicalOverview

STEP9.Press‘Coupling,’sothatbothpulsesbeginatthesametime.Addchannelsbychoosingchannel1,push‘utility’andselect‘OutputSetup’.

ViewthepulseonaKeysightMSO9404AInfiniiumoscilloscope.

Figure12.Step9.

STEP10.Varythechannel2delayandleveltojitterthepulse.

STE