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Multiple storage node full color active pixel sensors

  • US 6,606,120 B1
  • Filed: 04/12/1999
  • Issued: 08/12/2003
  • Est. Priority Date: 04/24/1998
  • Status: Expired due to Term
First Claim
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1. An active pixel sensor disposed on a semiconductor substrate of a first conductivity type, comprising:

  • a plurality of semiconductor regions, a first one of said semiconductor regions disposed in the substrate, each successive one of said semiconductor regions being enclosed entirely within another enclosing one of said semiconductor regions, said plurality of semiconductor regions alternating between the first conductivity type and a second conductivity type opposite to that of said first conductivity type, said first one of said semiconductor regions containing all successive ones of said semiconductor regions being of said second conductivity type, such that a plurality of series-connected photodiodes is formed between said substrate and an innermost enclosed one of said semiconductor regions;

    a plurality of reset switches, each one of said plurality of reset switches having a first terminal coupled to a different one of said alternating semiconductor regions, each one of said plurality of reset switches having a second terminal switchably coupled to a reset potential; and

    a plurality of storage nodes, each one of said plurality of storage nodes coupled to a separate one of said plurality of alternating semiconductor regions.

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