Principles of Power Integrity for PDN Design--Simplified: Robust and Cost Effective Design for High Speed Digital Products

Chapter 4. Inductance and PDN Design

4.1 Why Do We Care About Inductance in PDN Design?

The goal for the power distribution design to a meet a target impedance profile. We can simulate impedance with the right models for the components and interconnects of the PDN, and model all interconnects as transmission line segments, which can themselves be approximated as L and C elements at low enough frequency. The L, or inductance, of a signal conductor and its return path conductor is a fundamental electrical description that applies to all interconnects. We can also approximate other discrete components with L and C elements.

Inductive properties dominate impedance of real interconnects, especially at high frequency. Even at low frequency, the interaction ...