Patent ID: 7432568

Claim:
A high-voltage operating field effect transistor comprising: a substrate; a source region and a drain region spaced apart from each other on a surface of the substrate; a semiconductor channel formation region disposed in the surface of the substrate between the source region and the drain region; a plurality of division gates obtained through division in a source/drain direction and disposed above the semiconductor channel formation region; and a plurality of gate insulating films disposed between the semiconductor channel formation region and the plurality of division gates; wherein each of the division gates other than the division gate nearest the source region is resistive and has two end portions in a direction crossing the source/drain direction, adjacent division gates in the two end portions are alternately connected to each other along a source/drain direction to form one meandered gate, and a source side electrode and a drain side electrode are disposed on a source side end portion and a drain side end portion, respectively; wherein a signal electric potential is supplied to the division gate nearest the source region; and wherein a specified electric potential is supplied to the source side electrode, and a bias electric potential an absolute value of which is equal to or larger than that of the specified electric potential and which changes according to an increase or decrease in a drain electric potential is supplied to the drain side electrode.