You are all invited to attend the ECE Distinguished Speaker seminar by:

                                         Dr. Valencia Joyner Koomson

            Dr. Martin Luther King Jr. Visiting Professor, Massachusetts Institute of Technology

        Assistant Professor, Department of Electrical and Computer Engineering, Tufts University

                            System-on-Chip ICs in the New Age of "Edge" Computing:

                              From LiFi Networks to "Smart" Wearables and Beyond

                                                       November 5, 2021


                                          ENGR 1101 (Jajodia Auditorium)

It is projected that the number of IoT devices will reach 100 billion within the next decade. This exponential growth in demand for connected sensors and wearable computing has accelerated system-on-chip development. Optoelectronic systems will play a major role in this paradigm shift for both sensing and optical wireless networking due to the RF spectrum crunch. In this talk we will present key breakthroughs in the development of optoelectronic system-on-chip systems for indoor LiFi networking, funded by the NSF Engineering Research Center on Light Enabled Systems & Applications. A digitally-tuned CMOS LED driver circuit architecture, integrating dimming control and advanced multi-carrier data modulation schemes (e.g. orthogonal frequency division multiplexing), is presented. We will present the first demonstration of a 3D heterogeneously integrated optical multi-input/multi-output (MIMO) receiver combining tessellated InGaAs photodetector arrays with silicon CMOS readout circuitry operating at bit rates > 50Gb/s. Optical MIMO systems combined with space-time coding yield an increase channel capacity and efficiency, as well as, combat scintillation and alignment requirements for free-space optical (FSO) links. To realize millimeter-wave transceivers for high-speed wireless applications, this talk will present a novel hexagonal ferrite thin film deposition system applicable to Si and GaN and substrates for next generation self-bias ferrite devices operating in millimeter wave frequency range. We will present disruptive technology at the intersection of electrical engineering and biomedical sciences, including a non-invasive device implementing frequency-domain near-infrared imaging techniques to study biological tissue, including functional brain studies, cerebral oximetry, stroke assessment, and optical mammography. The device implements NIR spectroscopy methods in a compact form factor using a patented system-on-chip (SoC) platform. We will conclude the presentation with an overview of the promise of mobile technology for health care delivery in resource-constrained setting using machine learning methods, and wearable devices for chronic disease management.

Prof. Valencia Joyner Koomson is an Associate Professor in the Department of Electrical and Computer Engineering and the Tisch College of Civic Life at Tufts University. She completed the B.S. and M.Eng. degrees in electrical engineering and computer science at the Massachusetts Institute of Technology in 1998 and 1999, respectively. As a George C. Marshall Scholar, she studied at the University of Cambridge and received the M.Phil. and Ph.D. degrees in electrical engineering in 2000 and 2003, respectively. She is currently a 2021 Dr. Martin Luther King Jr. Visiting Professor in the Department of Electrical Engineering and Computer Science at MIT. interests are in advanced VLSI system design, micro/nanoelectronic circuits and systems, biomedical devices, health informatics, and advanced nano-/microfluidic systems to probe intercellular communication. She has co-authored several book chapters, publications, and holds a patent for a system and method for measuring phase delay and amplitude of an optical signal in animal tissue. In 2005, she held an Adjunct Professor appointment at Howard University. She has held visiting appointments at Rensselaer Polytechnic Institute and Boston University. Her research funding sponsors include NIH, NSF, DARPA, Catalyst Foundation, and W.M. Keck Foundation. Prof. Koomson is a George C. Marshall Scholar, Intel Foundation Scholar, National Science Foundation Graduate Research Fellow, and 2010 recipient of the NSF Faculty Early Career Development (CAREER) Award. She served as the Technical Program Chair of the 60th IEEE Midwest Symposium on Circuits in Systems. She is a member of several professional societies, technical program committees, and editorial