Patent ID: 6506648
Filing Date: 2003-01-14
Classification: H01L

Abstract:
A method of fabricating a high power RF lateral diffused MOS transistor (LDMOS) with increased reliability comprising the steps of:a) providing a substrate of one conductivity type having a major surface, b) forming a doped well of second conductivity type in the major surface, said doped well forming a lightly doped drain drift region for the LDMOS drain, c) forming a field oxide in the major surface around a device region, d) after step b forming a gate oxide on the major surface and over the doped well, e) after step d forming a gate on the gate oxide over a portion of doped well, f) forming a channel region of the first conductivity type extending under the gate by dopant implant and thermal drive-in, and g) forming a source region of second conductivity type in the channel region and aligned with the gate and a drain region in the doped well spaced from the gate.