Alexima Applies for GS Pixel with Tri-State Transfer Gate Patent
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Alexima's patent application US20140367552 "Image sensors, methods, and pixels with tri-level biased transfer gates" by Jaroslav Hynecek and Alexander Krymski proposes a global shutter "pixel with a transfer gate that is controllable among at least three biasing conditions, including a first biasing condition in which electrons are transferable from a photodiode to a potential well under the transfer gate, a second biasing condition in which the electrons are confined in the potential well under the transfer gate, and a third biasing condition in which the electrons are transferable out of the potential well under the transfer gate." The pixel cross-section and its band diagram in all 3 modes is shown below:
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