Patent ID: 7545018
Filing Date: 2009-06-09
Classification: H01L

Abstract:
1. A high voltage operating field effect transistor comprising: a substrate; a source region and a drain region which are spaced apart from each other in 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 gate region disposed above the channel formation region; and a gate insulating film region disposed between the channel formation region and the gate region; wherein at least one of a signal electric potential and a signal current is supplied to the source region, and a bias electric potential having an absolute value equal to or larger than a first constant electric potential which changes according to an increase or decrease in a drain electric potential is supplied to the gate region; wherein the gate region comprises a plurality of division gates disposed above the channel formation region, the plurality of division gates being obtained through division in a source/drain direction; wherein the gate insulating film region comprises a plurality of gate insulating films provided between the channel formation region and the plurality of division gates; and wherein one out of a source potential and a source current is supplied to the source region, the signal electric potential is supplied to the division gate nearest the source region of the plurality of division gates, and a bias electric potential which has an absolute value equal to or larger than a specified electric potential, which changes according to increase or decrease in a drain electric potential, and the absolute value of which becomes larger towards the drain region is supplied to the division gate which is nearer the drain region than to the division gates nearer the source region.