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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...
This paper describes a switched-current successive approximation ADC for high resolution current mode imagers. The ADC is suitable to be integrated at the column level and operate in parallel. Designed in a 0.25 mum CMOS process, its core occupies only 24 mum x 200 mum and consumes 930 muW. Having a low input impedance of 0.6 Omega, it can connect directly to the imaging array while providing a stable...
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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