Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/47604
Title: LOW- VOLTAGE HIGH EFFICIENCY ANALOG-TO-DIGITAL CONVERTER FOR BIOMEDICAL SENSOR INTERFACE
Authors: LIEW WEN SIN
Keywords: low-voltage, low-power, high-efficiency, analog-to-digital converter, SAR ADC, biomedical sensor interface
Issue Date: 7-Aug-2012
Source: LIEW WEN SIN (2012-08-07). LOW- VOLTAGE HIGH EFFICIENCY ANALOG-TO-DIGITAL CONVERTER FOR BIOMEDICAL SENSOR INTERFACE. ScholarBank@NUS Repository.
Abstract: This work focuses on the design of low-power high-efficiency ADC dedicated for biomedical sensor interface. An energy-efficient dual-capacitive-array architecture for successive approximation (SA) ADC is proposed. Unlike conventional topologies, the proposed architecture utilizes two capacitive arrays for quantization to reduce the switching energy in capacitive array. Additionally, the proposed design is a low-voltage rail-to-rail ADC without the need of rail-to-rail comparator. The ADC is fully dynamic and is optimized for low power dissipation while maintaining its accuracy. Furthermore, digital multiplexing scheme is introduced for the ADC design in multi-channel biomedical recording interface. An 8-channel SAR ADC based on digital multiplexing is presented to facilitate multiplexing among channels and thus eliminates the need for analog multiplexer and associated power-consuming buffers. Both of the proposed designs were integrated into practical biomedical sensor interface and verified through actual clinical trial and in-vivo test. All results show good recording quality.
URI: http://scholarbank.nus.edu.sg/handle/10635/47604
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