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An energy-efficient dual sampling SAR ADC with reduced capacitive DAC

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5 Author(s)
Binhee Kim ; Dept. of Electr. Eng., KAIST, Daejeon, South Korea ; Long Yan ; Yoo, J. ; Namjun Cho
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This paper presents an energy-efficient SAR ADC which adopts reduced MSB cycling step with dual sampling of the analog signal. By sampling and holding the analog signal asymmetrically at both input sides of comparator, the MSB cycling step can be hidden by hold mode. Benefits from this technique, not only the total capacitance of DAC is reduced by half, but also the average switching energy is reduced by 68% compared with conventional SAR ADC. Moreover, switching energy distribution is more uniform over entire output code compared with previous works.

Published in:

Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on

Date of Conference:

24-27 May 2009