Due to higher power and faster switching frequencies a very robust power distribution network is required. To achieve this the power distribution network needs to be modeled accurately at different stages of the design cycle. We present a methodology for the design and analysis of power distribution networks. The methodology covers the need for power grid analysis across all stages of the design process. We present techniques to accurately model the effects on power distribution networks due to parasitic wire capacitances, parasitic capacitances of transistors, explicit decoupling capacitors and inductance from package leads.