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Resonance noise, or power/ground bounce noise, between the power and ground planes of high-speed circuit packages is one of the main concerns of signal integrity or power integrity issues. A novel time-domain approach is proposed to extract the equivalent circuit models of power/ground planes by time-domain reflection and time-domain transmission waveforms. The extracted model can accurately predict the resonance behaviour of power/ground planes over a wide frequency range. These models can be efficiently incorporated into the HSPICE simulator for the consideration of power/ground bouncing noise in high-speed circuits.