Patent ID: 7579245
Filing Date: 2009-08-25
Classification: H01L

Abstract:
1. A method of forming a metal-oxide-semiconductor device having improved high-frequency characteristics, the method comprising the steps of: forming first and second source/drain regions of a first conductivity type in a semiconductor layer of a second conductivity type, the first and second source/drain regions being formed proximate an upper surface of the semiconductor layer and being spaced apart relative to one another; forming a non-uniformly doped channel region of the second conductivity type in the semiconductor layer, proximate the upper surface of the semiconductor layer and at least partially between the first and second source/drain regions; forming an insulating layer on at least a portion of the upper surface of the semiconductor layer; forming a first gate on the insulating layer at least partially between the first and second source/drain regions and above at least a portion of the channel region; and forming at least a second gate on the insulating layer substantially over the channel region and between the first gate and the second source/drain region, the second gate having a length over the channel region which is substantially greater than a length of the first gate over the channel region, the first and second gates being electrically isolated from one another; wherein the metal-oxide-semiconductor device is configured such that a conduction of the channel region is selectively controllable as a function of first and second signals applied to the first and second gates, respectively.