practical experiences in mipi d-physm and c-physm receiver ...€¦ · mohamed hafed & steven...
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![Page 1: Practical Experiences in MIPI D-PHYSM and C-PHYSM Receiver ...€¦ · Mohamed Hafed & Steven Chiang Introspect Technology & Trust-Tek Corporation Practical Experiences in MIPI D-PHYSM](https://reader034.vdocuments.mx/reader034/viewer/2022042322/5f0bda807e708231d43289c1/html5/thumbnails/1.jpg)
Mohamed Hafed & Steven ChiangIntrospect Technology & Trust-Tek Corporation
PracticalExperiencesinMIPID-PHYSMandC-PHYSM ReceiverTesting
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©2017MIPIAlliance,Inc.
InTheory…
2
DUTTestInstrument
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InRealLife…
3
IPBring-Up
• TestIPinisolation
• Theoreticalcase(perhaps!)
ComponentBring-Up
• Focusonentirechipfunctionalityincludinginterface
• Othereffectsstarttoappear
ApplicationModuleBring-Up
• Whereisthereceiver?
• Whereisthechannel?
• Whatstimulustouse?
TestRequirementsThroughProductLifecycleStages
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Agenda• Overviewofreceivertest• Illustrationofpracticalmoduleimplementationsand
evaluationplatforms• Recommendationsandbestpractices
4
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PhysicsofSignalTransmission
5
Transmitter
LargeSignalSmallNoise
Channel(cable,connector,flexPCB,package)
Receiver
SmallSignalLargeNoise
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ObjectiveofReceiverTest
6
Generateastressedsignalasifitwentthroughachannel
- ModelISI- ModelDCD- ModelJitter
Receiver
SmallSignalLargeNoise
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MIPID-PHYSM ReceiverSpecification
7
MIPID-PHYSMGenerator
DataRxClockRx
ReferenceChannel
ReferenceChannel
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MIPIC-PHYSM ReceiverSpecification
8
MIPIC-PHYSMGenerator DataRxReferenceChannel
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TheLinearChannelModel
9
Freq
|S21|
ΦS21
Freq
Freq
GrpDelayS21
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TheLinearChannelModel
10
LinearChannel
TimingEdgesLargelyUnaffectedinaLinearChannel
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TheLinearChannelModel
11
LinearChannel
TimingEdgesLargelyUnaffectedinaLinearChannel
Resultsinalmostnon-realisticjitterinjectionrequirements
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PracticalEvaluationBoard…Nonlinear!
12
IC
TestInstrument
FlexFlex
Discontinuity(Connector)
Discontinuity(Connector)BendorViaDiscontinuity
(TestPoint)
Discontinuity(Connector)
Discontinuity(Connector)
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LinearChannelVersusNon-LinearChannel
13
TxEyeDiagram
LinearChannelEyeDiagram(~0.3UIClosure)
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LinearChannelVersusNon-LinearChannel
14
TxEyeDiagram Non-LinearChannelEyeDiagram(~0.4UIClosure)Channelis25%Shorter
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PracticalExperiences:Skew
15
IC
TestInstrument
FlexFlex
BendorVia
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PracticalExperiences:Skew
16
PosNeg
PosNeg
CommonMode
Skewintroducescommon-modenoise(notgoodforreceiver!)Difficult todetectondifferentialscopeeyediagram
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PracticalExperiences:Reflections
17
IC
TestInstrument
FlexFlex
Discontinuity(Connector)
Discontinuity(Connector)
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PracticalExperiences:Reflections
18
Worst-caseexampleofachannelnon-linearity
Signalrisetimeissharp,butreflectionscancausebitflips
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PracticalExperiences:Reflections
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StubCausingCompleteEyeClosure SlowingDataRateRevealsStubWaveform
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PracticalExperiences:Grounding
20
IC
TestInstrument
FlexFlex
Connector
Connector
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PracticalExperiences:Grounding
21
HSeyediagramaffectedbyCMandDiffeffectsLPwaveformsaffectedbycrossinglevelsandreflections
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PracticalExperiences:Inductance
22
IC
TestInstrument
FlexFlex
Discontinuity(TestPoint)
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PracticalExperiences:Inductance
23
Oftenduetotestpoints
Makescorrelationwithspecificationsdifficult
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Recommendations
24
Adoptasystem-levelapproachtotest ifyourevaluationboardlookslikeasystem
Identifystressparameterssuitableforcharacterizingyourdeviceinitsenvironment
Characterizereceiverperformanceacrosssystemconstraintsaswellasthroughideal“linear”channel
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