Dr. Burak Eminoglu
Department of Electrical Engineering and Computer Sciences, UC Berkeley
BSAC Postdoctoral Researcher, Bernhard Boser Group
November 13, 2018 | 12:00 to 01:00 | 490 Cory Hall
Host: Michael Cable
MEMS gyroscopes have been used for a variety of applications including gaming and image stabilization. Long term stability of commercial MEMS gyroscopes remains a hindrance to meeting navigation requirements. In order to meet these requirements, a new solution is needed to improve long term stability without inordinate size, cost, and power. All sensors measure their input relative to a reference. Conventional gyroscopes are based on amplitude modulation (AM). They measure rate indirectly via the Coriolis force and synthesize the reference implicitly from a combination of transducer dynamics and readout circuit gain. By contrast, frequency modulated (FM) gyroscopes which measure rate directly as a frequency and use an external precision reference clock offer several advantages: accurate scale factor; large dynamic range; robust performance over temperature variation. Techniques to enhance the performance with the FM gyroscope that measures rate signal directly as frequency variations and employs a rate chopping technique to reject drift using a reference clock to set the scale factor will be presented. Symmetric and asymmetric readout modes enable trading-off long term-versus-short term errors without changing the transducer or circuits. Chopped at 10Hz, the prototype achieves better than 40ppm scale-factor accuracy, 1.5deg/hr1.5 rate-random walk in symmetric mode, and 1mdps/rt-Hz ARW in asymmetric mode.
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