General steps to follow when performing a PDN simulation using signal integrity analysis software

Create a schematic of your power distribution network (PDN), including all power components, voltage regulators, decoupling capacitors, and power/ground planes.

Define the electrical parameters for all components in your schematic, such as resistance, inductance, and capacitance.

Define your simulation's voltage and current sources, including the input and load currents.

Choose the simulation type and settings, such as DC, AC, or transient analysis.

Run the simulation and analyze the results, including voltage drop, current flow, and impedance.

As necessary, iterate on your design and simulation, changing the schematic or parameters until you achieve the desired PDN performance.