Patent ID: 6420738
Filing Date: 2002-07-16
Classification: H01L

Abstract:
An electric charge detector, comprising:a semiconductor substrate; a first conductivity-type well region formed on said semiconductor substrate; a second conductivity-type well region formed on said first conductivity-type well region; potential-change detection means connected to said second conductivity-type well region, for detecting a change in a surface potential of said second conductivity-type well region; a first conductivity-type diffused region formed on the surface of said second conductivity-type well region; and a second conductivity-type diffused layer, acting as a connection region, formed in a surface of said second conductivity-type well region, said second conductivity-type diffused layer having an impunty concentration higher than that of said second conductivity-type well region, said connection region being connected to said potential-change detection region.