Abstract
Effects of surface states and substrate traps on the "kink" (an abnormal increase in output conductance with the drain voltage) in GaAs MESFETs are studied by 2-D analysis. It is shown that the kink could also arise due to the surface-state effects: impact ionization of holes and the following hole trapping by the surface states. Transient or dynamic simulation indicates that the trap-related kink phenomena ate rather slow processes with long response times.
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