Patent ID: 9679894
Date: 2017-06-13
CPC Classifications: H01L

Claim:
1. A semiconductor variable resistor device, comprising: a substrate; a gate formed on the substrate, wherein the substrate further comprises a first trench formed outside a side of the gate; a first doped region and a second doped region formed in the substrate, the first doped region and the second doped region formed outside two sides of the gate, wherein the first trench is formed between the gate and the first doped region; and a first lightly doped drain region and a second lightly doped drain region formed in the substrate, wherein the first lightly doped drain region is formed between the first trench and the first doped region, and the second lightly doped drain region is formed between the gate and the second doped region, wherein, the first and the second doped regions form a source and a drain respectively, and the first trench has a depth larger than respective depth of the first and the second lightly doped drain regions.