Patent ID: 7813162
Filing Date: 2010-10-12
Classification: G11C,H01L

Abstract:
1. A static random access memory (SRAM) cell structure comprising: a pair of pull-up p-type field effect transistors (PFETs); a pair of pull-down n-type field effect transistors (NFETs), wherein each pull-down NFET comprises: a pair of pass gate transistors, wherein each pass gate transistor is an n-type field effect transistor comprising a first source/drain region, a pass gate halo region abutting said first source/drain region, a body region abutting said pass gate halo region, and a second source/drain region abutting said body region and disjoined from said pass gate halo region, wherein said pass gate halo region and said body region have a p-type doping, wherein said pass gate halo region has a higher dopant concentration than said body region.