Patent ID: 6653690
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A semiconductor device, comprising:a sense amplifier including first and second NMOS transistors and first and second PMOS transistors, each transistor having a size of about 0.5 &mgr;m or smaller, and further including first and second signal lines and first and second connector lines; wherein each of said transistors includes a source contact plug, a source diffusion layer, a drain contact plug, and a drain diffusion layer; wherein said first signal line and said first connector line are coupled via a first contact plug and said second signal line and said second connector line are coupled via a second contact plug; wherein said first signal line is coupled to said drain contact plug of said first NMOS transistor, and said first connector line is coupled to said drain contact plug of said first PMOS transistor; wherein said second signal line is coupled to said drain contact plug of said second NMOS transistor, and said second connector line is coupled to said drain contact plug of said second PMOS transistor; wherein for said first and second NMOS transistors, the source absolute voltage is fixed lower than the drain absolute voltage and for said first and second PMOS transistors, said source absolute voltage is fixed higher than said drain absolute voltage; wherein a source contact resistance, which is a resistance between the source contact plug and the source diffusion layer, of each of said transistors is smaller than a drain contact resistance, which is a resistance between the drain contact plug and the drain diffusion layer, of each of said transistors; wherein for each of said NMOS transistors, said source contact plug is made of tungsten and said drain contact plug is made of polysilicon; wherein for each of said PMOS transistors, said source contact plug and said drain contact plug are made of tungsten; and wherein said first and second signal lines are made of tungsten silicide, and said first and second connector lines and said first and second contact plugs are made of tungsten.