Patent ID: 9660072
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A laterally diffused metal oxide semiconductor (LDMOS), comprising: a substrate having a deep well of a second conductive type; a gate disposed on the substrate; a first doped region of a second conductive type located in the deep well and at a side of the gate; a drain region of a second conductive type located in the first doped region; a drain contact disposed on the drain region; a doped region of a first conductive type located in the first doped region and under the drain region but not directly below the drain contact, wherein one side of the doped region near the gate is trimmed with one side of the drain region near the gate; a second doped region of a first conductive type located in the deep well and at an opposite side of the gate corresponding to the side of the gate; a source region located in the second doped region; and an isolation structure disposed on the substrate between the gate and the drain region, wherein one side of the doped region near the gate is trimmed with one side of the isolation structure, and the doped region is not vertically below the isolation structure.