Patent ID: 6476460
Filing Date: 2002-11-05
Classification: H01L

Abstract:
A semiconductor device formed on a semiconductor substrate includes capacitor is formed to provide split voltages for semiconductor circuits, said device comprising:an active area in said substrate, a thin, gate oxide layer and field oxide regions formed over said substrate, an intermediate capacitor layer over said thin, gate oxide layer above said active area forming a bottom capacitor, a central dielectric layer over said intermediate capacitor layer, a via through said central dielectric layer to said intermediate upper capacitor layer, an intermediate conductive layer over said via and over said central dielectric layer, said intermediate conductive layer serving as a second lower plate for a top capacitor, an inter-layer dielectric layer over said intermediate conductive layer, and an upper capacitor layer over said inter-layer dielectric layer combining with said intermediate conductive layer and said inter-layer dielectric layer to form a top capacitor with a different capacitance value from said bottom capacitor.