Patent ID: 8269305
Filing Date: 2012-09-18
Classification: H01L

Abstract:
1. A high-voltage semiconductor device comprising: a first conductivity type semiconductor region formed on a dielectric layer; and n transistors formed in the first conductivity type semiconductor region in series connection with one another, n being two or more, wherein; a source electrode of a first stage transistor of the n transistors is connected to a low potential side of the semiconductor device and a drain electrode of a n-th stage transistor is connected to a high potential side of the semiconductor device; the transistors nearer to the high potential side are surrounded by the transistors nearer to the low potential side; and a gate terminal of the first stage transistor is a signal input terminal, and a drain terminal of the n-th transistor is a signal output terminal; wherein each transistor of the n transistors comprises a source layer formed in a surface region of the semiconductor region in a ring shape, a drain layer formed in the surface region of the semiconductor region inside the source layer with a predetermined distance from the source layer, a source electrode in connection with the source layer, a drain electrode in connection with the drain layer, and a connection wiring that connects the drain electrode of a preceding stage transistor to the source electrode of a following stage transistor, and n resistance elements formed in series connection with one another between the drain electrode of the n-th stage transistor and the low potential side, a low potential side of each resistance element being connected to the gate electrode of each stage of transistor.