Research Interests: Sensor interface circuits, MEMS, signal processing, controls
was born in Temple, TX in 1986. Mitchell received his BS from Texas A&M University in 2008 and his MS from the University of California, Berkeley in 2010. He is continuing to pursue a PhD at Berkeley under the advisement of Professor Bernhard E. Boser.
His research interests include sensor interface circuits, MEMS inertial sensors, signal processing, and controls. He has previously worked on power electronics---specifically capacitive power transfer for contactless charging and LED lighting applications. He has completed internships at National Instruments in Austin, TX in 2007 and Intrinsity in Bee Cave, TX in 2008.
FM Gyroscope [BPN608]
MEMS gyroscopes for consumer devices, such as smartphones and tablets, suffer from high power consumption and drift which precludes their use in inertial navigation applications. Conventional MEMS gyroscopes detect Coriolis force through measurement of very small displacements on a sense axis, which requires low-noise, and consequently high-power, electronics. The sensitivity of the gyroscope is improved through mode-matching, but this introduces many other problems, such as low bandwidth and unreliable scale factor. Additionally, the conventional Coriolis force detection method is very sensitive to asymmetries in the mechanical transducer because the rate signal is derived from only the sense axis. Parasitic coupling between the drive and sense axis introduces unwanted bias errors which could be rejected by a perfectly symmetric readout scheme. This project develops frequency modulated (FM) gyroscopes that overcome the above limitations. FM gyroscopes also promise to improve the power dissipation and drift of MEMS gyroscopes. We present results from a prototype FM gyroscope with integrated CMOS readout electronics demonstrating the principle.