Patent ID: 8063426

Claim:
An insulated gate device comprising a source connected to a source terminal, a gate connected to a gate terminal and input capacitance means providing capacitance between the gate terminal and the source terminal, wherein a value of the capacitance is a function of an effective thickness of an insulation layer at the gate, the effective thickness of the insulation layer being selected to ensure that a first ratio (C fiss /C iiss ) between a final value (C fiss ) of the capacitance when the device is on and an initial value (C iiss ) of the capacitance when the device is off is smaller or equal to a second ratio (Q G(max) /Q G(min) ) of a maximum allowable gate charge (Q G(max) ) and a minimum charge (Q G(min) ) required on the gate for complete switching of the device and such that 1<C fiss /C iiss <2.0.