Patent ID: 6153896
Filing Date: 2000-11-28
Classification: H01L,H03K

Abstract:
A semiconductor device comprising:a base layer of a first conductivity type;an emitter layer of a second conductivity type, formed on a surface of said base layer of the first conductivity type;a collector electrode, formed on a surface of said emitter layer of the second conductivity type;a base layer of the second conductivity type, formed in a surface of said base layer of the first conductivity type which is opposite to said emitter layer of the second conductivity type;a source layer of the first conductivity type, formed in a surface of said base layer of the second conductivity type;an emitter electrode, formed on said source layer of the first conductivity type and said base layer of the second conductivity type; anda gate electrode, contacting said source layer of the first conductivity type, said base layer of the second conductivity type and said base layer of the first conductivity type, with a gate insulating film interposed therebetween; whereinwhen a voltage is applied between said collector electrode and said emitter electrode, capacitance of said gate electrode is always a positive value or zero.