A Reconfigurable 5-to-14 bit SAR ADC for Battery-Powered Medical Instrumentation

被引：50

作者：

Fateh, Schekeb ^{[1
]}

Schoenle, Philipp ^{[1
]}

Bettini, Luca ^{[1
]}

Rovere, Giovanni ^{[1
]}

Benini, Luca ^{[1
]}

Huang, Qiuting ^{[1
]}

机构：

[1] ETH, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2015年 / 62卷 / 11期

关键词：

Analog front-end; biopotential signals; fully dynamic comparator; majority voting; multi-channel biomedical instrumentation; non-subtractive dither; perturbation based digital calibration; reconfigurable analog-to-digital converter; successive approximation register; NM CMOS; 10-BIT;

D O I：

10.1109/TCSI.2015.2477580

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In battery-powered medical instrumentation, the resolution and signal bandwidth of analog-to-digital converters (ADCs) have to be adapted to the needs of the application to avoid power wastage. This paper presents a reconfigurable successive approximation register (SAR) ADC implemented in 130 nm CMOS that resolves 5-14 bit with a maximum achievable effective number of bits (ENOB) of 13.5 using non-subtractive dither. In the proposed ADC design, the power consumption can be traded for accuracy to improve the energy efficiency and extend its application range, while reducing system integration complexity. A figure-of-merit (FoM) of 59 fJ/conversion is achieved at 1.2 V supply and the converter occupies an area of 0.42. Measurement results of the ADC integrated in a multi-channel analog front-end (AFE) circuit show the suitability of the ADC for portable medical monitoring devices.

引用

页码：2685 / 2694

页数：10

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