Patent ID: 11881527
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A lateral diffusion metal-oxide semiconductor (LDMOS) device, comprising:
a first gate structure and a second gate structure extending along a first direction on a substrate;
a first source region extending along the first direction on one side of the first gate structure, wherein a length of a sidewall of the first source region directly contacting a sidewall of the first gate structure is less than a length of the sidewall of the first gate structure directly contacting the first source region under a top view perspective;
a second source region extending along the first direction on one side of the second gate structure;
a drain region extending along the first direction between the first gate structure and the second gate structure;
a guard ring surrounding the first gate structure and the second gate structure under a top view perspective, wherein the guard ring directly contacts sidewalls of the first gate structure and the second gate structure extending along a second direction but not contacting sidewalls of the first gate structure and the second gate structure extending along the first direction; and
a shallow trench isolation (STI) surrounding the guard ring.