Accurate simultaneous switching noise estimation including velocity-saturation effects

Simultaneous switching noise (SSN) on power supply lines is caused by the large switching transient currents flowing through parasitic inductances at the chip-package-pin interface. A new expression to estimate SSN in CMOS circuits that includes the velocity saturation effects seen in the short-channel MOSFETs is derived. SPICE Level 3 simulation results show that the formula predicts the SSN more accurately as compared to existing approaches for submicron processes even at reduced supply voltages.