Analysis of trap-related kink dynamics in GaAs MESFETs

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.