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A linear current mode active pixel sensor for low fixed-pattern noise imaging is presented. The photo pixel is composed of a photodiode, a reset transistor, and a transconductance amplifier transistor. The address switch transistor is placed outside the pixel. The increased linearity of the pixel current coupled with current mode difference double sampling greatly reduces spatial variations across...
This paper describes a current-mode active pixel sensor (APS) for low supply voltage, low noise and high resolution/high speed imaging applications. The imager is designed in a standard 0.25 mum 2.5 V CMOS process. A transistor count of 1.5 per pixel is achieved through transistor sharing and floating diffusion (FD) based addressing. Highly linear current readout in velocity saturation, as well as...
A novel current mode active pixel sensor for high resolution imaging is presented. The photo pixel is composed of a photodiode and two transistors: reset and transconductance amplifier transistor. The switch transistor is moved outside the pixel, allowing for lower pixel pitch and increased linearity of the output photocurrent. The increased linearity of the image sensor has greatly reduced spatial...
We present a CMOS image sensor capable of both voltage- and current-mode operations. Each pixel on the imager has a single transistor acting as either source follower for voltage readout, or transconductor for current readout. The two modes share the same readout lines, but have their own correlated double sampling (CDS) units for noise suppression. We also propose a novel current-mode readout technique...
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