Patent ID: 7576387

Claim:
A MOS transistor comprising a semiconductor substrate region in which a source region, a channel region, a drain extension region and a drain contact region are provided, wherein the drain extension region mutually connects the drain contact region and the channel region, and wherein the channel region mutually connects the drain extension region and the source region, the MOS transistor further comprising a gate electrode, extending over the channel region, and a shield layer of an electrically conductive material, wherein the shield layer comprises a first, second and third portions configured to extend over the drain extension region and to be essentially parallel to a top surface of the drain extension region, wherein the second portion is configured to mutually connect the first portion and the third portion, wherein the first portion is closer to the gate electrode than the second portion and the second portion is closer to the gate electrode than the third portion, and wherein a distance between the drain extension region and the second portion is larger than a distance between the drain extension region and the first portion and a distance between the drain extension region and the third portion is larger than a distance between the drain extension region and the second portion.