Patent ID: 8829577
Filing Date: 2014-09-09
Classification: H01L

Abstract:
1. An image sensor, comprising: a photo detection device configured to gather photo-generated charge; a floating diffusion region; a transfer transistor configured to transfer photo-generated charge from the photo detection device to the floating diffusion region; a reset transistor configured to set a potential of the floating diffusion region to a desired value; a drive transistor configured to generate a signal output representative of the potential of the floating diffusion region; and a select transistor configured to transmit the signal output from the source region of the drive transistor, wherein the drive transistor includes: wherein the source region comprises a first doping source region and a second doping source region, and the first doping source region extends toward a region under the gate electrode and away from the second doping source region; a drain region coupled to a power voltage terminal and disposed on a second side of the gate electrode opposite the first side, wherein the drain region comprises a first doping drain region and a second doping drain region, and the first doping drain region extends toward the region under the gate electrode and further away from the second doping drain region than the first doping source region extends away from the second doping source region; a doping region formed below the source region and having a conductivity type different than the source region; and a doping region formed below the drain region and having a conductivity type different than the drain region.