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논문 기본 정보

저자정보
(Ulsan National Institute of Science and Technology) (Ulsan National Institute of Science and Technology) (Ulsan National Institute of Science and Technology)
저널정보
대한전자공학회 JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE Journal of Semiconductor Technology and Science Vol.18 No.2
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    초록·키워드

    This paper presents flash-assisted successive approximation register (SAR) analog-todigital converter (ADC) with an energy-efficient speed-boosting structure. The incorporation of a 3-bit flash sub-ADC into the SAR conversion path enables 4b/cycle conversion. For further speed boosting, the comparator is designed to include an auxiliary bootstrap capacitor which relieves settling-time bottleneck of capacitive digital-to-analog converters (C-DACs) in asynchronous SAR operation. This 4b/cycle conversion scheme requires only five switching events of C-DACs switching for 8-bit conversion, resulting in 22.32% reduction of additional switching energy. Prototype circuit implementation reveals that the proposed scheme achieves 75% speed enhancement compared to a conventional SAR scheme. For feasibility verification, the proposed flash-assisted SAR ADC was fabricated using a 0.18 mm CMOS process. Measured signal-tonoise and distortion (SNDR) and spurious-free dynamic range (SFDR) of the prototype were 48.49 dB and 64.95 dB respectively.

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