Patent ID: 6521946
Filing Date: 2003-02-18
Classification: H01L

Abstract:
A semiconductor device, comprising:a first transistor formed in a semiconductor substrate, comprising: a gate conductor; a gate insulator separating the gate conductor from a semiconductor material and defining a channel area in the semiconductor material opposite from the gate conductor; a source comprising a first doped region of a first conductivity type and adjacent the channel area; a drain comprising: a first well adjacent the channel area and having a first concentration of the first conductivity type; a first doped region portion having a second concentration of the first conductivity type, wherein the second concentration is greater than the first concentration and wherein the first doped region portion has a common interface with the first well; and a second doped region portion having the second concentration of the first conductivity type, wherein the second doped region portion has no common interface with the first well and is not adjacent the channel area; and a second transistor formed in the semiconductor substrate, comprising: a second well formed using a same implant step as the first well and thereby having the first concentration of the first conductivity type; a first source/drain comprising a second conductivity type complementary of the first conductivity type and formed within the second well; and a second source/drain comprising the second conductivity type and formed within the second well.