Pcb Designers Signal Integrity Guide.pdf

PCB Designer’s
SI Guide
A basic guide for SI and crosstalk for a PCB designer
Preface
What the heck is SI?
Why and what should I Simulate?
What is the strategy for SI Analysis?
Is crosstalk happens when you talk in the mobile?
What do you mean by transmission line?
Topology??? Are you kidding?
Delay?? How about a schedule change?

This is a collection of articles, which are found in web and other sources trying to answer your
questions. Hope it will be helpful
Table of Content
Basics of SI___________________________________________________________________5
When Speed is important? _____________________________________________5
Acceptable Voltage and timing values ________________________________5
Signal Integrity______________________________________________________5
Waveform Voltage Accuracy_______________________________________5
Timing_________________________________________________________5
Speed of currently used logic families ____________________________________5
Transition Electrical Length (TEL) __________________________________6
Critical length___________________________________________________6
What is Transmission Line? ________________________________________6
What is moving in a Transmission line?_______________________________6
Power Plane Definition____________________________________________6
The concept of Ground ____________________________________________7
STRIPLINE circuit with ic field _____________________________7
RLC Transmission Line Model _________________________________________8
What is Impedance? ______________________________________________8
A Practical impedance equation for microstrip _________________________8
What is relative dielectric constant Er? _______________________________9
2 Interconnections for High Speed Digital Circuits _________________________