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Final PresentationStas G. Alex A.

guided by Meir Nakar

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Goals

• Introduction to Signal Integrity

• Build a PCB to demonstrate SI phenomena

• Prepare an experiment lab

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Phases & Goals

Theory Study and Practice

Hardware and Software Tools (TDR, ICX)

SI Design – Exercise Preparation

Schematic, Layout and Fabrication

PCB Wide Set of Measurements and Simulations

Building an Academic High Speed Experiment Lab

1st se me st er

2nd semester

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Theory

Signal integrity concepts :

• Capacitance and inductance

• Crosstalk: mutual capacitance and mutual inductance

• Termination: end, middle and source

• Other termination topologies: bifurcated linesDaisy chaining

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Hardware and Software Tools

SMA Cable Transmission line

End of a cableConnection to a board

TDR ICX

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SI Design

Ten test-cases demonstrate various SI phenomena

Each case has specific topology

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Schematic, Layout and Fabrication

Schematic

Layout

Fabrication

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0

0.05

0.1

0.15

0.2

0.25

0.0E+00 5.0E-10 1.0E-09 1.5E-09 2.0E-09 2.5E-09 3.0E-09 3.5E-09

TDR

ICX

TDR: 17.5%ICX: 19.5%

PCB Measurments and Simulations

End Termination

ICX vs TDR

risetime: 628 ps

9PCB Measurments and Simulations

0.1

0.15

0.2

0.25

0.3

0.0E+00 5.0E-10 1.0E-09 1.5E-09 2.0E-09 2.5E-09 3.0E-09 3.5E-09

350p

628p

200p

1000p

2000p

min |r| = 4%max |r| = 31.5%

End Termination

TDR

reflection vs risetime

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0

0.1

0.2

0.3

0.4

0.0E+00 1.0E-09 2.0E-09 3.0E-09 4.0E-09 5.0E-09 6.0E-09

TDR

ICX

PCB Measurments and Simulations

middle termination:

ICX (rise time = 0.35n):

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Lab Structure...

ICX practiceTDR practiceTheory and questio

nsTDR studyICX study

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• Introduction to the signal integrity world

• Basic elements: capacitance and inductance

• Reflection• Terminations• Transmission

line topologies• Questions

Theory and Questions

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TDR Study

• General overview• TDR vs. Oscilloscope• Precautions• TDR capabilities and

functions

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ICX Study & Practice

• ICX as a simulation tool• Building circuits in ICX

electrical editor:– Inserting new devices– Creating connections

• Changing parameters in ICX:– Resistance of line– Device model

• Basic simulations

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ICX Practice ...

• 1st part ~3 hours• Three test cases:

– Capacitance experiment– Reflection - end termination– Bifurcated lines

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Tasks and simulations

Comprehensive questions

Summary questions

Detailedinstructions

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TDR Practice...

• 2nd part of the lab ~5 hours• Four test-cases:

– End termination– Bifurcated lines– Capacitance measure– Inductance measure

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TDR Practice (Continued)

• Assignments

• Step by step instructions

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TDR Practice

• Assignments and questions

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Recommendations

• Performing the lab by a group that Signal Integrity field is new for them,so are TDR and ICX tools