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Events for May 10, 2010
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Fully-passive wireless MEMS neural recorder
Mon, May 10, 2010 @ 11:30 PM - 12:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Junseok Chae, Arizona State UniversityAbstract:
Current wireless neuro-recording microsystems employ multi-component packages comprised of sophisticated circuitry located between the scalp and skull, which is then wired to micromachined electrode arrays implanted into the cortex of the brain. In order to remove these interconnects and improve signal acquisition quality some have monolithically integrated the circuits onto the electrodes and/or fabricated die-level post-CMOS electrodes on-chip. These advancements make it possible to monitor in-vivo potentials with extremely high spatial and temporal resolution. Nevertheless, challenges remain due to the complexity of wireless telemetry.
In this talk, we present an alternative, significantly less complex microsystem for passive and wireless neuro-recording consisting of only two varactors, three MIM capacitors, and an on-chip planar antenna. The wireless microsystem consists of an implantable circuit or "tag" to backscatter data to an external interrogator that supplies the fundamental carrier. The backscattering circuit relies solely on its nonlinear components, varactor diodes, which mix and backscatter neuro-potentials with the supplied carrier. The wireless microsystem was demonstrated using emulated and in-vivo neuro-potentials as low as 500 ìVP-P and up to 3 kHz.Biography:
Junseok Chae received the B.S. degree in metallurgical engineering from the Korea University, Seoul, Korea, in 1998, and the M.S. and Ph.D. degrees in EECS (Electrical Engineering and Computer Science) from the University of Michigan, Ann Arbor, in 2000 and 2003, respectively. After a couple of years of being research fellow at Michigan, he is now at Arizona State University as an assistant professor in electrical engineering. His areas of interest are MEMS for biomedical applications.
He received the 1st place prize and the best paper award in DAC (Design Automation Conference) student design contest in 2001. He has published over 75 journal and conference articles, one book, two book chapters, and holds two US patents. He received NSF CAREER award on MEMS protein sensor array.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
