Patent ID: 6580109
Filing Date: 2003-06-17
Classification: H01L

Abstract:
A semiconductor integrated circuit device, comprising:a substrate of monocrystalline semiconductor material including an epitaxial layer formed thereon, the epitaxial layer extending to an upper semiconductor surface; a plurality of transistors having P-type and N-type regions defined within the epitaxial layer; and at least first and second photodiodes having different structures, each photodiode being formed in the epitaxial layer above an N+ buried layer disposed at the bottom of the epitaxial layer, the first photodiode having an efficient drift region, the second photodiode having a fast drift region, each drift region consisting of a lightly doped N-type portion of the epitaxial layer disposed above the respective N+ buried layer, the first photodiode being further characterized by a first P-type anode region extending from the upper semiconductor surface to a first depth therebelow where a first PN junction is defined with the efficient drift region, the second photodiode being further characterized by a second P-type anode region extending from the upper semiconductor surface to a second depth therebelow where a second PN junction is defined with the fast drift region, the thickness of the efficient drift region being more than twice the thickness of the fast drift region.