Patent ID: 9653459
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate comprising a substrate region of a first conductivity; a first region of the first conductivity formed in the substrate, wherein the first region has a higher doping density than the substrate region; a second region of the first conductivity formed in the first region, wherein the second region has a higher doping density than the first region, and wherein at least one sidewall of the second region is in direct contact with the first region; a first drain/source region of a second conductivity formed in the second region; a second drain/source region of the second conductivity formed in the substrate and directly contacting the substrate region, wherein a first conductivity type doping density gradually declines from the first drain/source region to the second drain/source region and the first drain/source region and the second drain/source region have a same doping density range; and a pickup region of the first conductivity having a first portion formed in the second region and adjacent to the first drain/source region and a second portion formed in the substrate, wherein the first portion of the pickup region is between a first isolation region and a second isolation region, and wherein the first isolation region is in the second region and the second isolation region is in the first region, and wherein a portion of the second region in direct contact with the first portion of the pickup region has a higher doping density than a portion of the substrate in direct contact with the second portion of the pickup region.