Patent ID: 11876134
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. An integrated circuit, comprising:
a source region and a drain region having a first conductivity type extending into a semiconductor substrate, the drain region having a first dopant concentration;
a channel region having an opposite second conductivity type between the source region and the drain region;
a drift region having the first conductivity type extending between the channel region and the drain region, the drift region having a second dopant concentration less than the first dopant concentration;
a LOCOS structure over the drift region and having a tapered portion extending toward the drain region; and
a buffer region having the first conductivity type under the tapered portion, the buffer region having a third dopant concentration less than the first dopant concentration and greater than the second dopant concentration.