Power Management for Wearable Electronic Devices

This book describes power management integrated circuits (PMIC), for power converters and voltage regulators necessary for energy efficient and small form factor systems. The authors discuss state-of-the-art PMICs not only for battery powered wearable devices, but also energy harvesting-based devices. The circuits presented support voltage scaling to reduce the overall average power consumption of a wearable device, resulting in longer device operating time. The discussion includes many designs, control techniques and approaches to distribute efficiently the power among different blocks in the device.

• Demonstrates for readers how to innovate in designing power management integrated circuits (PMIC) suitable for wearable devices, powered by either battery or harvesting energy;

• Introduces a dual outputs switched capacitor, using a single voltage regulator to minimize the area overhead and discusses the effect of having more than two outputs on the area and power efficiency;

• Introduces a novel clock-less digital LDO regulator that eliminates the use of the clocked comparator and serial shift register in the conventional design;

• Presents experimental results of energy harvesting-based power management units (PMU), using different combinations of power converters and voltage regulators, providing a guide for designers to select the appropriate option based on device requirements.

Dima Kilani (S’13) received her PhD, Msc and B.S. degrees in Electrical and Electronics Engineering from Khalifa University, UAE, in 2019, 2015 and 2013, respectively. Her PhD and Msc research focused on low-power mixed signal integrated circuit design including voltage regulators and DC-DC power converters targeting high power efficiency. She is currently a postdoctoral Fellow at Khalifa University where she focuses on power management unit design for energy harvesting applications. Kilani’s work has appeared in high impact publications such as  IEEE Transaction of Circuits and Systems (TCAS) as well as presented at prestigious international conferences such as International Symposium of Circuits and Systems (ISCAS). Kilani has 15 publications and one patent filed.

 

Baker Mohammad (M’04–SM’13) received the B.S. degree from the University of New Mexico, Albuquerque, NM, USA, the M.S. degree from Arizona State University, Tempe, AZ, USA, and the Ph.D. degreefrom the University of Texas at Austin, Austin, TX, USA, in 2008, all in electricaland computer engineering. He was a Senior Staff Engineer and the Manager with Qualcomm, Austin, where he was involved in designing high performance and low power DSP processor used for communication and multimedia application. He was involved in a wide range of microprocessors design with Intel Corporation, Santa Clara, CA, USA, from high performance, server chips >100 W (IA-64), to mobile embedded processor low power sub-1 W (xscale). He has over 16 years of industrial experience in microprocessor design with an emphasis on memory, low power circuit, and physical design. He is currently an Assistant Professor of Electronic Engineering with the Khalifa University of Science, Technology and Research, Abu Dhabi, United Arab Emirates, and a Consultant with Qualcomm Inc., San Diego, CA, USA. In addition, he is involved in microwatt range computing platform for WSN focusing on energy harvesting and power management, including efficient dc/dc and ac/dc converters. He holds ten issued U.S. patents and has several pending patent applications. He has authored one book entitled Embedded Memory Design for Multi-Core and SoC and co-authored several publications in digital system design, memory design and testing, energy harvesting, power management, and power conversion, in addition to emerging memory technology modeling and design. His current research interests include power efficient computing, high yield embedded memory, and emerging technology, such as memristor, STTRAM, and computer architecture. Dr. Mohammad has served the IEEE in many editorial and administrative capacities. He is a member of the Technical Program Committee of several IEEE conferences, such as the International Conference on Computer Design, the International Conference on Environmental and Computer Science, and the VLSI-SoC Conference. He is a Regular Reviewer of the IEEE TRANSACTIONS ON VLSI SYSTEMS and the IEEE TRANSACTIONS ON DESIGN AUTOMATION OF ELECTRONIC SYSTEMS. He is an Active Member of region eight student activities, including the Student Best Paper Competition, the UAE Chapter Student Day, and the KUSTAR Student Branch Advisor.

 

Mohammad Alhawari (M’16) is an Assistant Professor in the Electrical and Computer Engineering at Wayne State University, Detroit, USA. Prior to joining Wayne State University, he was a Post-doctoral Research Fellow at Khalifa University from 2016 to 2018. Alhawari earned his Ph.D. from Khalifa University in 2016, his M.Sc. from Masdar Institute in 2010 and his B.Sc. from Yarmouk University in 2008. Alhawari’s work has appeared in high impact publications such as IEEE Journal Solid-State Circuits (JSSC) and IEEE Transaction of Circuits and Systems (TCAS) as well as presented at prestigious international conferences such as International Solid State Circuit Confenece (ISSCC) and International Symposium of Circuits and Systems (ISCAS). Alhawarihas authored a book titled “Energy Harvesting for Self-Powered Wearable Devices”, authored/coauthored 3 book chapters, has 2 granted and 2 pending patents. He has been a regular reviewer for more than 10 journals. Alhawari has been leading students and researchers and managing key research projects at the Khalifa Semiconductor Research Center (KSRC), funded by the U.S. Semiconductor Research Coorporation (SRC) under the ACE4S Center of Excellence. Dr. Alhawari is focusing on Energy Harvesting and Power Management Circuits, Wireless Power Transfer and Bioelectronics Medicine

           

Hani Saleh (SM’16) is an assistant professor of electronic engineering at Khalifa University since Jan, 2012. He is an active member in KSRC (Khalifa University Research Center) where he leads a project for the development of wearable blood glucose monitor SOC and a mobile surveillance SOC and safe exercise monitoring device. Hani published 81 articles in peer-reviewed journals and conferences, he has 11 issued US patents and 3 pending patent applications. Hani has a total of 19 years of industrial experience in ASIC chip design, microprocessor design, DSP core design, graphics core design and embedded system design. His experience spans DSP core design, microprocessor peripherals design, microprocessors and graphics core deign. Prior to joining Khalifa University he worked as a Senior Chip Designer (Technical Lead) at Apple incorporation; where he worked on the design and implementation of Apple next generation graphics cores for its mobile products (iPad, iPhone, …etc.), prior to joining Apple, he worked for several leading semiconductor companies including Intel (ATOM mobile microprocessor design), AMD (Bobcat mobile microprocessor design), Qualcomm (QDSP DSP core design for mobile SOC’s), Synopsys (a key member of Synopsys turnkey design group where he taped out many ASICs and designed the I2C DW IP includedin Synopys DesignWare library), Fujitsu (SPARC compatible high performance microprocessor design) and Motorola Australia (M210 low power microprocessor synthesizable core design).

 

Mohammed Ismail (S’80–M’82–SM’84–F’97) spent over 25 years in academia and industry in the U.S. and Europe. He served as a Faculty Member with the Ohio State University’s (OSU) ElectroScience Laboratory, Columbus, OH, USA. He was a Research Chair with the Swedish Royal Institute of Technology, Stockholm, Sweden, where he founded the Radio and Mixed Signal Integrated Systems Research Group. He held visiting appointments with Aalto University, Espoo, Finland, the Norwegian Institute of Technology, Trondheim, Norway, the University of Oslo, Oslo, Norway, Twente University, Enschede, The Netherlands, and the Tokyo Institute of Technology, Tokyo, Japan. He joined the Khalifa University of Science, Technology and Research, Abu Dhabi, United Arab Emirates, in 2011, where he holds the ATIC Professor Chair and is the Head of the Electrical and Computer Engineering Department, which exists on both campuses in Sharjah and Abu Dhabi. He advised the work of over 50 Ph.D. degree students and over 100 M.S. degree students. He has served as a Corporate Consultant to over 30 companies and is the Co-Founder of Micrys Inc., Columbus, Spirea AB, Stockholm, Firstpass Technologies Inc., Dublin, OH, USA, and ANACAD (currently part of Mentor Graphics), Cairo, Egypt. He is currently a prolific author and an entrepreneur in chip design and test. He is the Founder of the OSU’s Analog VLSI Laboratory, one of the foremost research entities in the field of analog, mixed signal, and RF integrated circuits. He serves as the Director of KSRC and the Co-Director of the ATIC-SRC Center of Excellence on Energy Efficient Electronic Systems targeting self-powered chip sets for wireless sensing and monitoring, biochips, and power management solutions. He has authored or co-authored over 20 books and over150 journal publications and holds eight U.S. patents issued and several pending. His current research interests include self-healing design techniques for CMOS RF and millimeter wave ICs in deep nanometer nodes. Prof. Ismail received the U.S. Presidential Young Investigator Award, the Ohio State Lumley Research Award four times in 1992, 1997, 2002, and 2007, and the U.S. Semiconductor Research Corporations Inventor Recognition Award twice. He is the Founding Editor of the Journal of Analog Integrated Circuits and Signal Processing (Springer) and serves as the Journals Editor-in-Chief. He has served the IEEE in many editorial and administrative capacities. He is the Founder of the IEEE International Conference on Electronics, Circuits and Systems and the Flagship Region 8 Conference of the IEEE Circuits and Systems Society.