Texas Instruments Incorporated
TRANSISTORS WITH DUAL WELLS

Abstract:

In some examples, a transistor includes a first well doped with a first-type dopant having a first concentration. The transistor also includes a gate oxide layer on a portion of the first well and a gate layer on the gate oxide layer. The transistor further includes a first segment of a second well doped with the first-type dopant having a second concentration, the first segment underlapping a first portion of the gate layer. The transistor also includes a source region doped with a second-type dopant having a third concentration, the source region in the first segment. The transistor further includes a drain region doped with the second-type dopant having a concentration that is substantially the same as the third concentration.