Authors: K. Horio, Y. Mitani and A. Wakabayashi
Affilation: Shibaura Institute of Technology, Japan
Pages: 510 - 513
Keywords: GaAs MESFET, gate lag, surface state, recessed gate, buried gate
We have made two-dimensional simulation of turn-on characteristics of recessed-gate and buried-gate GaAs MESFETs, and studied how the gate-lag or the slow current transient (which may occur due to surface states) is affected by the recess-structural parameters and the off-state gate voltage VGoff . It is shown that when VGoff is around the threshold voltage (pinch-off voltage) Vth, the gate-lag could be greatly reduced by introducing the buried-gate structure. However, it is suggested that large gate-lag might be seen when VGoff is much more negative than Vth.