Title: Energy efficient comparator for successive approximation register ADCs with application to wireless sensor networks

Authors: Shitong Yuan; Hai Huang; Qilian Liang; Qiang Li

Addresses: Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019-0016, USA ' School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China ' Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019-0016, USA ' School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China

Abstract: In energy constrained wireless sensor networks (WSNs), increasing the lifetime is one of the major challenges. A new low-voltage low-power consumption comparator for Successive Approximation Register Analogue to Digital Converter has been designed to prolong the lifetime in WSNs in this paper. The input is amplified by a differential amplifier with positive feedback structure in the pre-amplifier. The positive feedback latch can reduce the power consumption. Using a constant bias circuit to provide two different bias voltages, an eliminated effect of different process variations on the amplifier is observed. Lifetime of individual sensor node as well as lifetime of sensor networks which using traditional circuits are compared with new architecture and their probability density functions (pdf) has been figured out.

Keywords: WSNs; wireless sensor networks; energy efficiency; network lifetime; preamplifiers; latches; ADC; analogue-to-digital converters; low-voltage comparators; low-power comparators; power consumption.

DOI: 10.1504/IJSNET.2015.067866

International Journal of Sensor Networks, 2015 Vol.17 No.2, pp.122 - 129

Received: 15 Mar 2013
Accepted: 02 Oct 2013

Published online: 07 Mar 2015 *

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