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US 7,002,129 B2Granted
Charge detection node with reset feed-through shielding gate
AssigneeTexas Instruments Incorporated
InventorJaroslav Hynecek
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Abstract
The charge detection device includes a floating diffusion, a reset transistor, a feed through shielding transistor, and a bias tracking voltage reference generator for biasing an output diode. The reset feed through shielding transistor gate overlaps the reset transistor gate to minimize the reset feed through. The bias tracking voltage reference generator output is adjusted such as to set a predetermined reset time constant for the device and to optimize the detection node performance by minimizing the charge spill back during the reset transistor turning off interval.
Claims8
A charge detection device comprising:
- a floating diffusion;
- a feed through shielding transistor coupled to the floating diffusion;
- a reset transistor coupled to the shielding transistor;
- an output diode diffusion coupled to the reset transistor;
- a bias tracking voltage reference generator coupled to the output diode diffusion for providing bias to the output diode diffusion;
- and
- wherein an input of the reference generator is coupled to a gate of the feed through shielding transistor.
4 more elements
Dependencies are inferred from the claim text.