IEEE Circuits and Systems Magazine - Q3 2018 - 1

Circuits
and Systems
IEEE

MAGAZINE

Volume 18, number 3

Third Quarter 2018

Features

Towards a Continuous Non-Invasive Cuffless
Blood Pressure Monitoring System Using
PPG: Systems and Circuits Review
Guoxing Wang, Mohamed Atef, and Yong Lian
This paper presents an overview of the cuffless, continuous time, non-invasive blood
pressure measuring devices (cniBp) based on photoplethysmography (ppg). The
cniBp fundamental challenges, such as motion artifacts (mas), noise, low ppg
signal amplitude with large dc components, and possible solutions are discussed.
Techniques and circuits for mas reduction, dc photocurrent cancellation, and sensitivity improvements are presented. To enhance the Bp system performance, both
the optimization of the integrated ppg receiver design and the reduction of the led
driver power consumption are introduced. useful design considerations are proposed
for designers to improve the ppg-based Bp system accuracy.

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State-of-the-Art Power Management Circuits
for Piezoelectric Energy Harvesters
Francesco G. Dell'Anna, Tao Dong, Ping Li, Yumei Wen, Zhaochu Yang,
Mario R. Casu, Mehdi Azadmehr, and Yngvar Berg
piezoelectric energy harvesters scavenging energy from the environment have been
a promising solution to satisfy the increasing power demand in wireless sensor nodes.
power conditioning circuits for piezoelectric energy harvesters are a burgeoning technology widely disclosed in literature since 2001; however, there is still no complete overview
available, which exhaustively describes the cutting-edge status of the research on power
conditioning for piezoelectric energy harvesters. This paper aims at providing a more
complete review on the state-of-the-art piezoelectric energy harvesting interfaces. a systematic categorization of the piezoelectric energy harvesting approaches is presented,
based on the qualitative working principle, adopted control scheme, and employed components. The presented power conditioning interfaces are commented and discussed
in detail, addressing the strengths and weaknesses based on the achieved results.
Furthermore, this paper performs a critical comparison of state-of-the-art techniques
by employing seven criteria to evaluate the performance of an energy harvesting system. The observed trend in this field is to design harvesting rectification schemes by
employing maximum power point Tracking (mppT) algorithms to achieve a high power
conversion efficiency (pce) and, resonant rectification techniques to harvest efficiently
energy from wide-band excitations.

Printed in U.S.A.

Digital Object Identifier 10.1109/MCAS.2017.2770210

Third QuarTer 2018

ieee circuiTs and sysTems magazine

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Table of Contents for the Digital Edition of IEEE Circuits and Systems Magazine - Q3 2018