Patent ID: 7288449
Filing Date: 2007-10-30
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device having a first and second transistor respectively of an electrostatic discharge protection circuit and internal circuit, the method comprising the steps of: providing a substrate; forming gates of the first and second transistor on the substrate; depositing a mask layer and patterning the mask layer using one single mask to remove the mask layer on the gates, a portion of a drain region of the first transistor, and a source and drain region of the second transistor; implementing a first ion implantation with a first concentration under the masking of the patterned mask layer; removing the mask layer and forming sidewall spacers of the gates; and implementing a second ion implantation with a second concentration, wherein the concentration of the second implantation is heavier than that of the first implantation.