Monday, January 26, 2015
4:00-5:00pm
Fung Auditorium, Powell-Focht Bioengineering Hall
University of California San Diego
On-Chip RF Power Harvesting for Biomedical Implantable Wireless Sensors
Khaled Nabil Salama
King Abdullah University of Science and Technology (KAUST)
Abstract: An On-Chip RF Energy Harvesting module is proposed to deliver power to wireless sensors from incoming RF signals. This module provides a platform for battery-less, miniaturized wireless sensors that can be implanted inside human body to monitor physical properties such as pressure or temperature and send the reading wirelessly to an external reader. As a battery-less device, it is implanted once and no need for more invasive operation to replace the sensor node or its battery. The proposed RF energy harvesting module includes highly efficient RF rectifier, DC voltage limiter, voltage sensors to enable power management, low dropout regulator (LDO) to provide clean power rail for on-chip transmitter. It is the first fully integrated CMOS-based RF power harvester with an on-chip antenna. The design is optimized for sensors implanted inside the eye to wirelessly monitor the intraocular pressure of glaucoma patients. The chip has been designed and fabricated in a standard 0.18μm CMOS technology. To emulate the eye environment in measurements, a custom test setup is developed that comprises Plexiglass cavities filled with saline solution. Measurements in this setup show that the proposed chip can be charged to 1V wirelessly from a 5-W transmitter 3 cm away from the harvester chip. The energy that is stored on the 5-nF on-chip MOSCAP when charged to 1 V is 2.5 nJ. Applications to monitoring of other neurodegenerative diseases will also be presented.
Bio: Dr. Khaled Salama received his bachelor's degree with honors from the Electronics and Communications Department at Cairo University in Egypt in 1997, and his master's and doctorate degrees from the Electrical Engineering Department at Stanford University, in 2000 and 2005 respectively. He was an assistant professor at RPI between 2005 and 2009. He joined King Abdullah University of science and technology (KAUST) in January 2009 and was the electrical engineering founding program chair till August 2011. His work on CMOS sensors for molecular detection has been funded by the National Institutes of Health (NIH) and the Defense Advanced Research Projects Agency (DARPA), awarded the Stanford-Berkeley Innovators Challenge Award in biological sciences and was acquired by Lumina Inc in 2008. He is the cofounder of Ultrawave Labs, a VC funded biomedical imaging company. He is the co-author of 90 papers and 10 patents on low-power mixed-signal circuits for intelligent fully integrated sensors and nonlinear electronics especially memristor devices. He is a senior member of IEEE.
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Organized by:
UCSD Institute for Neural Computation, http://inc.ucsd.edu
UCSD Institute of Engineering in Medicine, http://iem.ucsd.edu
Sponsored by:
Qualcomm Inc., http://www.qualcomm.com
Brain Corporation, http://www.braincorporation.com