Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-09-21
2009-08-11
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S208100
Reexamination Certificate
active
07573017
ABSTRACT:
Disclosed herein is an active pixel sensor having a first transistor amplifying voltage generated in response to light at an integration node; a second transistor selects a specific pixel from a pixel array; a third transistor resets voltage of the integration node to voltage supplied from VDD during a reset period; a fourth transistor connects a photogate capacitance to the integration node increasing a dynamic range when the voltage of the integration node is VDD-Vth; a fifth transistor generates a signal voltage in a logarithmic response to light when the voltage of the integration node is logarithmic bias voltage-Vth; and a photodiode to convert photons into electron pairs in a depletion layer, causing signal charges to be accumulated when light is incident from outside.
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GG. Storm, J.E.D. Hurwitz, D. Rensaw, K.M. Findlater, R.K. Henderson, and M.D. Purcell, “Combined Linear-Logarithmic CMOS Image Sensor,” 2004 IEEE International Solid-State Circuits Conference, Jun. 2004.
Sungsik Lee, and Kyounghoon Yang, “High Dynamic-Range CMOS Image Sensor Cell Based on Self-Adaptive Photosensing Operation,” IEEE Transactions On Electron Devices, vol. 53, pp. 1733-1735, Jul. 2006.
Lee Ha Joon
Yang Kyoung Hoon
Bui-Pho Pascal M
Korea Advanced Institute of Science and Technology
Le Que T
Much Shelist
Sacharoff Adam K.
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