Dive into an in-depth video lecture on PCB track impedance and Time-Domain Reflectometry (TDR) presented by Eric Bogatin. Explore key concepts such as characteristic impedance, reflections in PCB tracks, and the reasons behind using 50-ohm impedance. Learn about differential pairs, closely and loosely coupled differential impedance, and how to conduct TDR simulations and measurements on various PCB tracks and coaxial cables. Gain insights into the practical applications of TDR in PCB design, understand when small impedance changes matter, and discover why ground is sometimes removed under pads. This comprehensive presentation offers clear explanations and demonstrations to enhance your understanding of impedance in PCB layout, essential knowledge for every PCB designer.
What Every PCB Designer Needs to Know About PCB Track Impedance - TDR - Eric Bogatin
Overview
Syllabus
What is this video about
What TDR is and what it does?
What is characteristic impedance
Why reflections are bad
Why do we use 50 ohm in pcb tracks?
Are lower impedance tracks more immune to noise?
Can you use any impedance for differential pairs?
What is difference between closely and loosely coupled diff impedance
Experimenting with TDR simulation
Measuring and explaining TDR on a simple pcb track
Can we do TDR on a real board?
Measuring and explaining TDR on a pcb track with different width
Answer: Why we sometimes remove ground under pads
Measuring a coaxial cable with TDR
Why you may need TDR are where it is used
Do we really need to care about small changes in impedance? When?
Taught by
Robert Feranec
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