Simultaneous switching noise estimation for ASICs

Simultaneous switching noise (SSN) on power supply lines is caused by the switching current flowing through parasitic inductances at the chip-package-pin interface. A new formulation for SSN in CMOS circuits that includes the velocity saturation effects seen in the short-channel MOSFETs is derived. The effect of skewing output voltage switching among different drivers on SSN is studied. SSN of ASICs when used in single-chip printed wiring board and multichip module environments are discussed.