Power integrity covers all the issues associated with supplying low noise DC voltages to the active devices, and all the interconnects in the power distribution network (PDN) from the VRM to the on-die rail. This includes on-die capacitance, package lead inductance, on-package decoupling capacitors, multiple plane cavities, on-board decoupling capacitors, bulk decoupling capacitors, VRM design, parallel resonance structures and interactions in the entire PDN ecology.
