Abstract: An active pixel sensor is disposed on a semiconductor substrate of a first conductivity type, and comprises a plurality of semiconductor regions disposed in the substrate, each successive one of the semiconductor regions and alternating between the first conductivity type and a second conductivity type opposite to that of the first conductivity type being enclosed entirely within another enclosing one of the semiconductor regions. A first enclosing one of the semiconductor regions containing all other ones of the semiconductor regions is of the second conductivity type. A plurality of reset switches each has a first terminal coupled to a different one of the alternating semiconductor regions, and a second terminal switchably coupled to a reset potential. Each one of a plurality of storage nodes is coupled to a separate one of the plurality of alternating semiconductor regions.