Patent ID: 8614490

Claim:
A semiconductor device comprising: first and second isolation regions formed separately from each other and arranged in a first direction; a third isolation region including a window and formed such that the window accommodates the first and second isolation regions therein, the window including first and second side edges opposite to each other and third and fourth side edges opposite to each other, each of the first and second side edges extending in the first direction, and each of the third and fourth side edges extending in a second direction crossing the first direction; an active region defined by the first, second isolation regions and the window of the third isolation region, the active region including a first portion between the first isolation region and the first side edge of the window of the third isolation region and a second portion between the second isolation region and the first side edge of the window of the third isolation region, the first portion including first and second channel regions that divide the first portion into first, second and third parts, the first channel region being between the first and second parts, the second channel region being between the second and third parts, the second portion including third and fourth channel regions that divide the second portion into fourth, fifth and sixth parts, the third channel region being between the fourth and fifth parts, and the fourth channel region being between the fifth and sixth parts; a first gate electrode formed over the first channel region with an intervention of a first gate insulating film; a second gate electrode formed over the second channel region with an intervention of a second gate insulating film; a third gate electrode formed over the third channel region with an intervention of a third gate insulating film; a fourth gate electrode formed over the fourth channel region with an intervention of a fourth gate insulating film; a first drain region formed in the second part of the first portion of the active region; a second drain region formed in the fifth part of the second portion of the active region; and a common source region continuously formed in the first and third parts of the first portion of the active region, in the fourth and sixth parts of the second portion of the active region and in a portion of the active region along the first and second isolation regions.