10-11-2016 дата публикации
Номер: US20160329408A1
Принадлежит:
The present invention provides a transistor comprising a substrate having a surface; a first deep well region in the substrate; a second deep well region in the substrate, isolated from and encircling the first deep well region; a first well region in the substrate and on the first deep well region; two second well regions in the second deep well region and respectively at two opposite sides of the first well region; a source region in the first well region and adjacent to the surface; two drain regions in the two second well regions respectively and adjacent to the surface; two gate structures on the surface, wherein each of the two gate structures is between the source region and one of the drain regions respectively; and a guard ring in the substrate encircling the second deep well region, and on the periphery of the transistor. 1. A high-side field effect transistor , comprising:a substrate having a surface;a first deep well region disposed in the substrate;a second deep well region disposed in the substrate, separated from and encircling the first deep well region;a first well region disposed in the substrate and on the first deep well region;two second well regions disposed in the second deep well region and respectively at two opposite sides of the first well region;a source region disposed in the first well region and adjacent to the surface of the substrate;two drain regions disposed in the two second well regions respectively and adjacent to the surface of the substrate;two gate structures disposed on the surface of the substrate, wherein each of the two gate structures is disposed between the source region and one of the drain regions respectively; anda guard ring disposed in the substrate encircling the second deep well region, and on the periphery of the high-side field effect transistor.2. The high-side field effect transistor according to claim 1 , wherein the source region comprises a source contact region with a conductive type different from a ...
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