When a Signal Hits The End of a PCB Track - What happens? | Reflections by Eric Bogatin

Ringing caused by reflections can be fixed. What is happening and what to do? Explained by Eric Bogatin. Thank you Eric.

Links:

• Software used in the video: https://www.bethesignal.com/bogatin/vrpw3016-yoshi-animations-reflections-p-1072.html
• Signal Integrity Academy (use FEDSI - 3 months free): https://www.bethesignal.com/bogatin/3monthsubscription.php
• FEDEVEL courses: https://courses.fedevel.com/

Chapters: 00:00 Understanding reflections 01:06 Electrically Short vs. Long 02:52 The tool we are using explained 03:48 Simulating: Electrically short 08:04 Reflections on classic CMOS and standard board 10:41 Simulating: Electrically long (e.g. DDR3 / DDR4) 15:16 50 OHM impedance is not 50 OHM resistance 16:39 Simulating a buffer example 18:32 Why we get reflections 20:37 What happens when there is a reflection 25:44 Why reflection disappears 30:08 Frequency of ringing 31:49 How to eliminate reflections 35:37 Signal level change caused by termination 39:25 Source termination

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• Robert ... https://www.youtube.com/watch?v=vFRtFiDz9wM