Account for Radiation Effects in Signal Integrity Analysis of PCB Digital Systems

A method of account for radiation effects (total dose and particle fluence) in signal integrity analysis of digital system by using IBIS model is presented. It is shown that account for these effects in IBIS models can be performed by correction the input impedances of protection circuits (GND_Clamp and POWER_Clamp), output MOSFETs (PULL_UP, PULL_DOWN) characteristics and RAMP parameters in according with the known physical relations. Examples of digital IC output and cross talk signals simulation with Hyper Lynx software using the created IBIS model is presented.

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