That AC signal energy is contained in the field between the trace and it's return is such a powerful model compared to taking the DC model of "going the lowest impedance path" and just assuming it applies at AC. Very, very, very good talk.
This model also automatically makes clear why you'd want signal-GND-GND-signal instead of a power plane because that side's signals will have coupling into the power plane. It is mentioned explicitly in the video as well.
https://resources.altium.com/p/2-the-extreme-importance-of-p...
That AC signal energy is contained in the field between the trace and it's return is such a powerful model compared to taking the DC model of "going the lowest impedance path" and just assuming it applies at AC. Very, very, very good talk.
This model also automatically makes clear why you'd want signal-GND-GND-signal instead of a power plane because that side's signals will have coupling into the power plane. It is mentioned explicitly in the video as well.