Analytical calculation of pattern-dependent simultaneous switching outputs (SSO) due to power supply fluctuations

An equivalent circuit model for simultaneous switching output (SSO) drivers is constructed. The simultaneous differential equations for the pattern-dependent SSO waveforms are built from the model and analytically solved. The analytical solutions are validated by comparison with the HSPICE simulation results. The effects of the number of pull-up and pull-down transitions are also investigated from the case studies.