Developing Improved IO Buffer Behavioral Modeling Methodology Based on IBIS

A new macromodeling methodology based on IBIS (input/output buffer information specification) models is proposed. IBIS models are known to lack information regarding power and ground bounce (Varma, et. al., 2004 and Yang, et. al., 2005) resulting in incorrect system level simulations. The new macromodel works with available simulators and produces models that can be simulated accurately for simultaneous switching noise (SSN). To demonstrate the solution, a CMOS voltage-mode driver circuit and a MICRON DDR2 driver are simulated using HSPICE and compared with equivalent circuits created with IBIS models of the same drivers