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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 propose a new type of oversampled analog-to-digital converter. It uses digital extrapolators to predict the analog signal before it is converted, and a coarse quantizer to convert the prediction error. Such converters are expected to have reduced complexity in their analog circuitry, thanks to the processing in the digital domain. General linear extrapolation algorithms are derived from the spline...
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