Patent ID: 9059277
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A method of fabricating a radio frequency (RF) laterally diffused metal oxide semiconductor (LDMOS) device, comprising the steps of: providing a substrate; forming a p-type epitaxial layer over the substrate; forming a p-type well in a first portion of the p-type epitaxial layer; forming a lightly doped n-type drain region in a second portion of the p-type epitaxial layer, the lightly doped n-type drain region being separated from the p-type well; forming a moderately doped n-type region in a first portion of the lightly doped n-type drain region, the moderately doped n-type region having a depth greater than a depth of the lightly doped n-type drain region; forming a heavily doped n-type drain region in a second portion of the lightly doped n-type drain region, the heavily doped n-type drain region being separated from the moderately doped n-type region; and forming a heavily doped n-type source region in an upper portion of the p-type well, wherein an n-type dopant concentration of the moderately doped n-type region is lower than both n-type dopant concentrations of the heavily doped n-type drain region and the heavily doped n-type source region and is higher than or equal to an n-type dopant concentration of the lightly doped n-type drain region.