Patent ID: 8937272
Filing Date: 2015-01-20
Classification: H01L

Abstract:
1. An image sensor pixel, comprising: a semiconductor substrate; a photosensitive element formed in the semiconductor substrate; a floating diffusion region that includes at least two N-type doping regions formed at respective different depths within the semiconductor substrate; a charge transfer transistor coupled between the photosensitive element and the floating diffusion region; and a vertical junction field effect transistor (JFET) source follower coupled to the photosensitive element via the charge transfer transistor, wherein the vertical junction field effect transistor source follower has a gate that is integrated into the floating diffusion region, wherein the vertical junction field effect transistor source follower further includes a channel that is formed from at least two P-type doping regions implanted respectively within the at least two N-type doping regions associated with the floating diffusion region.