Patent ID: 6228708
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A method of manufacturing a high voltage mixed-mode device, comprising the steps of:providing a substrate wherein the substrate comprises an isolation region, an active region and a first oxide layer formed on the active region;removing a portion of the first oxide layer to divide the active region into a first and second active region, wherein the second active region is covered by the first oxide layer;forming a second oxide layer on the first active region and the first oxide layer on the second active region;forming a first conductive layer on the second oxide layer and the isolation region;forming a patterned third oxide layer on the first conductive layer over the isolation region;forming a patterned second conductive layer on the third oxide layer and the first conductive layer over the first and the second active regions; andremoving the first conductive layer until the second oxide layer on the first and the second active regions and the isolation region are exposed.