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This paper discusses the electrical characteristics of power distribution networks (PDNs) in 3DICs on both system and chip level. In the system-level analysis the global resonance effects in 3D PDNs are highlighted. For chip-level analysis, detailed metal-layer-based power grid model is proposed for the first time for 3D PDNs. With the detailed power grid model, local resonance effects that are unique to 3D PDNs are revealed. The spatial and temporal impacts of distributed current sources on the time-domain noise of 3D PDNs are also explored based on the multi-source worst-case noise calculation algorithm. Simulation results demonstrate the “Rogue Wave” phenomenon in 3D PDNs.