Compact modelling of transient response of multifinger devices

Abstract

In order to ensure an effective and a proper function of an ESD protection device, a SPICE type simulation is strongly recommended. However, SPICE type compact models of multifinger ESD devices are not widely available, especially those that describe high-current characteristics and physical phenomena, such as snapback, that are extremely important for ESD protection.What distinguish multi-finger SCR ESD models from other SCR circuit models are : the current source that models the avalanche source, the resistor that models substance resistance and the RC line between the fingers to model the delay of diffusion the carriers. The main aim of this thesis is to find good approaches for modeling these factors and thus for modeling entire multi-finger ESD SCR devices, such as the device from the paper [1] “Simultaneous and Sequential Triggering in Multi-Finger Floating-Base SCRs Depending on TLP Pulse Rise Time”. In this thesis two compact multifinger ESD protection device models were presented for SPICE type transient simulation. The first model is a model of the device from [1], which is tested, as in the paper, against Transmission line pulses (TLP). While the second model is a model of an asymmetric multifinger ESD protection device, that takes more modelling factors into account, and is tested against power surge. A close look is further taken at the parameters of the model and their effect on the trigger behavior.