Multiple storage node full color active pixel sensors
First Claim
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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Accused Products
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 being enclosed entirely within another enclosing one of the semiconductor regions. The plurality of semiconductor regions alternates between the first conductivity type and a second conductivity type opposite to that of the first conductivity type. A first enclosing one of the semiconductor regions containing all other ones of the semiconductor regions is of the second conductivity type, such that a plurality of series-connected photodiodes is formed between the substrate and an innermost enclosed one of the semiconductor regions. 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.
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Citations
18 Claims
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1. An active pixel sensor disposed on a semiconductor substrate of a first conductivity type, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An active pixel sensor disposed on a semiconductor substrate of a first conductivity type, comprising:
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a first well having a second conductivity type opposite to that of said first conductivity type disposed in said substrate;
a second well having said first conductivity type disposed within said first well;
a region of said second conductivity type disposed in said second well;
a plurality of reset switches, each one of said plurality of reset switches having a first terminal coupled to a different one of said first well, said second well, and said region of said second conductivity type, 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 first well, said second well, and said region of said second conductivity type. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification