Concept and Design of a High Speed Current Mode Based SAR ADC

Elkafrawy, Abdelrahman, Ortmanns, Maurits

ISBN 10: 613992801X / ISBN 13: 9786139928019

Published by LAP LAMBERT Academic Publishing, 2018

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Bibliographic Details

• Title: Concept and Design of a High Speed Current Mode Based SAR ADC
• Publisher: LAP LAMBERT Academic Publishing
• Publication Date: 2018
• Language: English
• ISBN 10: 613992801X
• ISBN 13: 9786139928019
• Binding: paperback
• Condition: New
• Book Type: book

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Synopsis

There is continuous research to exploit the improved speed of scaled CMOS technologies in realizing high-speed analog-to-digital converters and SAR ADCs are one of the candidates which can significantly benefit from this technology scaling. Remarkable improvements have been recently reported on single-channel time-interleaved charge-based SAR ADCs to achieve sampling rates in the range of GS/s with excellent power effeciency but the challenge of driving a large sampling capacitor with high accuracy in a short sampling window is often not addressed. In this work, a high-speed current-mode DAC is replacing the commonly used charge-mode SC-DAC which alleviates the problem of driving a large input sampling capacitor in a short time. The proposed current-mode SAR ADC also uses a Gm stage which converts the input voltage to a current which is then processed in a current-based binary search algorithm SAR loop. In comparison to the conventional SC-SAR ADC structures, the sampling capacitor size is smaller than the total capacitance of the comparable SC-SAR ADCs. Moreover, low-impedance DAC-reference voltages which are essential for SC-DAC are removed by using this approach.