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In this paper, a 9-bit 1.3 GS/s single channel SAR ADC is presented. In conventional SAR ADCs, the capacitive DAC size grows exponentially with respect to converter resolution. This results in both signal bandwidth and conversion speed reduction. The proposed architecture implements binary search through a redundant capacitive DAC for the 5 first MSBs and through programmable comparator thresholds...
In this paper, a technique aiming at enhancing the conversion speed of asynchronous high resolution SAR ADCs is presented. In conventional SAR ADCs, the capacitive DAC size is growing exponentially with the converter resolution. The settling time of the MSB capacitors get thus longer, limiting the total conversion speed. This method proposes to operate a small and fast 3-bit ADC in parallel with the...
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