Power Integrity Interaction
Power integrity and signal integrity are intimately coupled in modern integrated circuits and high-speed electronic systems. The interaction between power distribution networks and signal paths creates complex phenomena that can significantly impact system performance, timing accuracy, and overall reliability. As switching speeds increase and voltage margins shrink, understanding and controlling these interactions becomes essential for successful system design.
The coupling between power and signal domains manifests in multiple ways: switching currents in signal paths induce voltage fluctuations on power rails, substrate noise couples between circuit blocks, and power supply variations modulate signal timing and amplitude. These effects can cause jitter, crosstalk, logic errors, and other failures that are often difficult to diagnose and mitigate without a thorough understanding of the underlying mechanisms.