BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Turkey BEGIN:DAYLIGHT DTSTART:20380119T061407 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=3TU;BYMONTH=1 TZNAME:+03 END:DAYLIGHT BEGIN:STANDARD DTSTART:20160907T000000 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=1WE;BYMONTH=9 TZNAME:+03 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20191025T213859Z UID:1F6B25F8-4D21-40AA-A834-B3A0EC6CAE74 DTSTART;TZID=Turkey:20191025T123000 DTEND;TZID=Turkey:20191025T143000 DESCRIPTION:25 October 2019 (12:40): IEEE AP/MTT/EMC/ED Turkey Seminar Seri es (S.55)\n\nSpeaker: Asst. Prof. Erdinç Tatar\, UNAM\, Bilkent Universit y\n\nTopic: "Finding Solutions to the MEMS Gyroscope Drift Problem"\n\nLoc ation: Middle East Technical University\, Ankara\, Turkey\n\nAbstract: In this talk\, I will mainly focus on my PhD research in Carnegie Mellon Univ ersity and extending my PhD work on sensor drift suppression. One major pe rformance limiting problem that is common among most of the sensors is the drift. Environmental stress and temperature effects are believed to be th e major source of the drift and the latter is studied the most in the lite rature. Certain enhancements are achieved but the sensor drift cannot be r emoved completely by temperature compensation. My PhD thesis successfully addressed the drift problem for gyroscopes by incorporating the stress sen sor and the gyroscope on the same die for the first time. Through ovenizat ion my research demonstrated that stress compensation suppresses the long term drift by seven fold. Since stress compensation achieved promising res ults\, I would like to extend this work by designing better on-chip stress sensors\, investigating the die stress with different die attaches and di e mount techniques\, and applying stress compensation to a circular gyrosc ope.\n\nHigh drive displacement improves the signal to noise ratio of a re sonator but also leads to a nonlinear force displacement behavior that is observable as a hysteresis in the frequency-phase and frequency-amplitude relations. My thesis proposed a cubically shaped nonlinearity tuning comb finger design that cancels the inherent softening nonlinearity of the gyro scope drive mode by introducing a DC voltage controlled hardening nonlinea rity. The functionality of the fingers was demonstrated and cancelling dri ve nonlinearities resulted in a better bias instability compared to the hi gh displacement with nonlinear characteristics.\n\nFinally\, I will conclu de my talk with my near term research interests that include designing a b etter stress compensated gyroscope and developing acoustic resonance gas s ensors.\n\nBio: Erdinc Tatar was born in Denizli\, Turkey. He received B.S . and M.S. degrees (with high honors) in Electrical and Electronics Engine ering from Middle East Technical University (METU)\, Ankara\, Turkey\, and Ph.D. degree in Electrical and Computer engineering from Carnegie Mellon University\, Pittsburgh\, PA\, in 2008\, 2010\, and 2016 respectively. He was a Graduate Research Assistant with Micro-Electro-Mechanical Systems Re search and Applications Center\, METU\, and with Carnegie Mellon Universit y from 2008 to 2011\, and 2012 to 2016\, respectively. From 2016 to 2019 h e worked as a MEMS Design Engineer responsible for the development of next generation gyroscopes in Analog Devices\, Inc.\, Wilmington\, MA. Current ly he is an assistant professor with the Department of Electrical and Elec tronics Engineering and UNAM in Bilkent University. His research interests include MEMS sensors (specifically Inertial and Gas sensors)\, microfabri cation and packaging technologies\, and readout and control electronics fo r MEMS sensors. Dr. Tatar has authored multiple IEEE journal and conferenc e papers. He also serves as a reviewer for major MEMS journals such as Jou rnal of Micromechanics and Microengineering and IEEE Sensors.\n\nSpeaker(s ): Asst. Prof. Erdinç Tatar\, \n\nAnkara\, Ankara\, Türkiye LOCATION:Ankara\, Ankara\, Türkiye ORGANIZER:ozergul@metu.edu.tr SEQUENCE:0 SUMMARY:IEEE AP/MTT/EMC/ED TURKEY CHAPTER SEMINAR SERIES -- SEMINAR 55 URL;VALUE=URI:https://events.vtools.ieee.org/m/208403 X-ALT-DESC:Description: <br /><p><strong>25 October 2019 (12:40): &nbsp\;IE EE AP/MTT/EMC/ED Turkey Seminar Series (S.55)</strong></p>\n<p>Speaker: As st. Prof. Erdin&ccedil\; Tatar\, UNAM\, Bilkent University</p>\n<p>Topic: "Finding Solutions to the MEMS Gyroscope Drift Problem"</p>\n<p>Location:& nbsp\;Middle East Technical University\, Ankara\, Turkey</p>\n<p>Abstract: &nbsp\; In this talk\, I will mainly focus on my PhD research in Carnegie Mellon University and extending my PhD work on sensor drift suppression.&n bsp\; One major performance limiting problem that is common among most of the sensors is the drift.&nbsp\; Environmental stress and temperature effe cts are believed to be the major source of the drift and the latter is stu died the most in the literature.&nbsp\; Certain enhancements are achieved but the sensor drift cannot be removed completely by temperature compensat ion.&nbsp\; My PhD thesis successfully addressed the drift problem for gyr oscopes by incorporating the stress sensor and the gyroscope on the same d ie for the first time.&nbsp\; Through ovenization my research demonstrated that stress compensation suppresses the long term drift by seven fold.&nb sp\; Since stress compensation achieved promising results\, I would like t o extend this work by designing better on-chip stress sensors\, investigat ing the die stress with different die attaches and die mount techniques\, and applying stress compensation to a circular gyroscope.</p>\n<p>High dri ve displacement improves the signal to noise ratio of a resonator but also leads to a nonlinear force displacement behavior that is observable as a hysteresis in the frequency-phase and frequency-amplitude relations.&nbsp\ ; My thesis proposed a cubically shaped nonlinearity tuning comb finger de sign that cancels the inherent softening nonlinearity of the gyroscope dri ve mode by introducing a DC voltage controlled hardening nonlinearity.&nbs p\; The functionality of the fingers was demonstrated and cancelling drive nonlinearities resulted in a better bias instability compared to the high displacement with nonlinear characteristics.</p>\n<p>Finally\, I will con clude my talk with my near term research interests that include designing a better stress compensated gyroscope and developing acoustic resonance ga s sensors.</p>\n<p>Bio: Erdinc Tatar was born in Denizli\, Turkey.&nbsp\; He received B.S. and M.S. degrees (with high honors) in Electrical and Ele ctronics Engineering from Middle East Technical University (METU)\, Ankara \, Turkey\, and Ph.D. degree in Electrical and Computer engineering from C arnegie Mellon University\, Pittsburgh\, PA\, in 2008\, 2010\, and 2016 re spectively.&nbsp\; He was a Graduate Research Assistant with Micro-Electro -Mechanical Systems Research and Applications Center\, METU\, and with Car negie Mellon University from 2008 to 2011\, and 2012 to 2016\, respectivel y.&nbsp\; From 2016 to 2019 he worked as a MEMS Design Engineer responsibl e for the development of next generation gyroscopes in Analog Devices\, In c.\, Wilmington\, MA.&nbsp\; Currently he is an assistant professor with t he Department of Electrical and Electronics Engineering and UNAM in Bilken t University.&nbsp\; His research interests include MEMS sensors (specific ally Inertial and Gas sensors)\, microfabrication and packaging technologi es\, and readout and control electronics for MEMS sensors.&nbsp\; Dr. Tata r has authored multiple IEEE journal and conference papers.&nbsp\; He also serves as a reviewer for major MEMS journals such as Journal of Micromech anics and Microengineering and IEEE Sensors.</p> END:VEVENT END:VCALENDAR