Patent ID: 11869982
Assignee: MONOLITHIC POWER SYSTEMS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming a junction field effect transistor (JFET) comprising:
forming a mesa on a substrate, wherein the mesa includes a first layer with a first conductivity type, wherein the first layer is located over a second layer with a second conductivity type, and wherein the first and second conductivity types are opposite;
after forming the mesa, implanting channel region dopants of the first conductivity type in the second layer to form a vertical channel region; and
implanting channel control region dopants of the second conductivity type into a first side of the mesa to form a first portion of a first base region on a sidewall on the first side of the mesa and into a second side of the mesa to form a first portion of a second base region on a sidewall on the second side of the mesa,
wherein the vertical channel region is within the mesa between the first base region and the second base region.