Patent ID: 11888060
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method, comprising:
forming a device die including an active area on a semiconductor substrate, the active area including a first active area portion and a second active area portion;
forming at least one mesa in the semiconductor substrate extending in a longitudinal direction through the active area; and
forming a channel region in the at least one mesa extending in the longitudinal direction, the channel region including low threshold voltage channel portions and high threshold voltage channel portions,
the first active area portion including the channel portions in a first ratio of low threshold voltage channel portions to high threshold voltage channel portions, and
the second active area portion including channel portions in a second ratio of low threshold voltage channel portions to high threshold voltage channel portions,
wherein the first ratio is larger than the second ratio.