Patent ID: 9570440
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A method for forming a semiconductor device, the method comprising the steps of: forming a buried layer below a top substrate surface of a semiconductor substrate having a first conductivity type, wherein the buried layer has a second conductivity type that is different from the first conductivity type; forming a sinker region between the top substrate surface and the buried layer, wherein the sinker region has the second conductivity type, and an isolation structure is formed by the sinker region and the buried layer; forming an active device in a portion of the semiconductor substrate contained by the isolation structure, wherein the active device includes a body region of the second conductivity type and a source region of the first conductivity type formed in the body region, and wherein the body region and the isolation structure are separated by a portion of the semiconductor substrate having the first conductivity type; and forming a diode circuit between the isolation structure and the body region.