Image sensor pixel circuitry with transistors to improve...

Details Image sensor pixel circuitry with transistors to improve... Image sensor pixel circuitry with transistors to improve...

2007-03-27

2007-03-27

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C348S307000, C348S308000

Reexamination Certificate

active

11144933

ABSTRACT:
An image sensor comprising a pixel sensor, a first transistor, a second transistor, a third transistor and a fourth transistor. The pixel sensor receives illumination to generate a photocurrent. The first transistor coupled to a voltage source and the pixel sensor, is controlled by a reset signal to activate or deactivate. A first node is coupled to the first transistor and the pixel sensor, and the voltage source provide a first potential. The second transistor coupled to a second node and the first node, receives a reference voltage. The third transistor, coupled to the voltage source, is controlled by the voltage on the second node. The fourth transistor coupled to the third transistor and the image sensor, is controlled by a selection signal to activate or deactivate.

REFERENCES:
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patent: 6097022 (2000-08-01), Merrill et al.
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patent: 6930338 (2005-08-01), Lee
patent: 2003/0103153 (2003-06-01), Fossum

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