This video covers:

Power rail noise is one of the most significant sources of jitter in high-speed systems, phase noise in RF systems, and noise in A/D and D/A converters. Semiconductor manufacturers are responding by continuously improving Power Supply Rejection Ratio (PSRR).

PDN impedances continue to fall, challenging us to measure ever lower impedance values.

These improvements expose a dramatic increase in measurement error. Most of this error is related to Ground Loops.