Patent ID: 7876610
Filing Date: 2011-01-25
Classification: G11C,H01L,Y10S

Abstract:
1. A semiconductor device comprising: a first-conductivity-type semiconductor substrate; a plurality of first transistors formed on the semiconductor substrate, each of which includes a first gate electrode, a second-conductivity-type first diffused layer constituting one of a source region and a drain region, and a second-conductivity-type second diffused layer constituting the other of the source and drain regions, the first gate electrode being shared by said plurality of first transistors; isolation regions which are formed in the semiconductor substrate and isolate said plurality of first transistors from one another; a first-conductivity-type impurity region which is formed in a region of the semiconductor substrate where said plurality of first transistors are formed in such a manner that the depth of the first-conductivity-type impurity region is greater than the depth of the first and second diffused layers of said plurality of first transistors; and a plurality of first field stoppers which are formed in the channel length direction in the isolation region located below the first gate electrode and a plurality of second field stoppers which are formed in the channel length direction in the isolation region adjacent to the second diffused layers and which are not formed in the channel length direction in the isolation region located between the first diffused layers of the plurality of first transistors, wherein the plurality of second field stoppers contact at least one of the plurality of first field stoppers and are separated from each other in the channel width direction, and the plurality of first field stoppers and the plurality of second field stoppers are separated from any other field stoppers in the isolation region between the plurality of first transistors.