Yu-Ching Yeh received the B.S. and M.S. degrees in electrical engineering from National Taiwan University, Taipei, Taiwan, in 2009 and 2011, respectively. She is currently pursuing her Ph.D. degree at the University of California, Berkeley.
She worked on millimeter-wave wireless transceivers for her master's thesis, and current research interests focus on MEMS inertial sensor interface circuits.
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.