Patent ID: 11973139
Assignee: SILANNA ASIA PTE LTD
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A laterally diffused MOSFET device comprising:
a source region in an active layer;
a drain region in the active layer;
a body region in the active layer between the source region and the drain region;
a drift region in the active layer between the body region and the drain region, wherein the drift region is in direct physical contact with the body region without an element between them and extends to a top surface of the active layer for an entire lateral extent between the body region and the drain region without a shallow trench isolation region or a local oxidation of silicon isolation region between the body region and the drain region;
a stepped gate having a first portion disposed over the body region and a second portion disposed over a first portion of the drift region;
a first gate insulator region between the first portion of the stepped gate and the body region; and
a second gate insulator region between the second portion of the stepped gate and the first portion of the drift region;
wherein:
the first portion of the stepped gate has a first length of about 0.1-0.4 μm;
the second portion of the stepped gate has a second length of about 0.1-0.6 μm;
the first gate insulator region has a first thickness of about 30-62 Å; and
the second gate insulator region has a second thickness of about 300-500 Å.