Patent ID: 6153911
Filing Date: 2000-11-28
Classification: H01L

Abstract:
A metal oxide semiconductor (MOS) device with an input protection circuit at a stage higher than internal circuitry thereof, comprising:a) a first doped region as part of said input protection circuit, whose conductivity type is opposite to that of a semiconductor substrate on the surface of which said first doped region is formed;b) a second doped region as part of said internal circuitry, whose conductivity type is opposite to that of said semiconductor substrate on the surface of which said second doped region is formed;c) a plate formed over said semiconductor substrate in an area at least between said first and second doped regions, isolated by an insulator between said plate and said semiconductor substrate, whose potential is fixed, for suppressing surface inversion of said semiconductor substrate; andd) a high concentration doped region of the same conductivity type as said semiconductor substrate in which said high concentration doped region is formed in the area between said first and second doped regions apart from the first doped region and the second doped region.