Strongly recommended · for advanced
What your Differential Pairs Wish You Knew with Rick Hartley - AltiumLive Keynote
Why people recommend it
Rick Hartley's talk on routing differential pairs, recommended for understanding reference planes, return currents and termination at high speeds.
Watch for: Best after his grounding talk; aimed at USB and faster signals
In their words
For further learning on this matter, I highly recommend Rick Hartley's two talks - "The Extreme Importance of PC Board Stackup" and "What your differential pairs wished you knew".
Polynomial on electronics.stackexchange.com, Jan 2023. CC BY-SA.
In a keynote by Rick Hartly titled "What your Differential Pairs Wish You Knew", it is suggested that especially at high speeds, it is necessary to terminate the differential pair not with one resistor, but two resistors with a capacitor going to the same reference plane as the signals.
Anas Malas on electronics.stackexchange.com, Nov 2022. CC BY-SA.
On the other hand, a lot of old, experienced PCB design engineers laugh at those app notes, and say it's not true.
Rocketmagnet on electronics.stackexchange.com, Mar 2021. CC BY-SA.
