Long-term gyroscope drift can be effectively removed by employing simultaneous on-chip stress and temperature compensation. Stress effects are significant and their inclusion augments the commonly applied temperature compensation. A silicon-on-insulator matched-mode $z$ -axis vibratory-rate gyroscope, as a prototype testbed to study these effects, includes released silicon resistors connected in a Wheatstone bridge as on-chip stress sensors. The gyroscope is ovenized within 300 K ± 20 mK using an external heater and an on-chip temperature sensor to suppress the temperature effects. The gyroscope is in-house vacuum packaged and operated at matched closed-loop drive and sense modes. Stress compensation significantly suppresses long-term drift resulting in 9°/h/ $\surd $ Hz angle random walk and 1°/h bias instability at 10 000 s (around 3 h) averaging time, which is seven times improvement over the uncompensated gyroscope output. The sensitivity of zero-rate offset to stress is -0.22°/day/Pa and -0.045°/day/Pa for the tests with and without externally applied stress, respectively.
CITATION STYLE
Tatar, E., Mukherjee, T., & Fedder, G. K. (2017). Stress Effects and Compensation of Bias Drift in a MEMS Vibratory-Rate Gyroscope. Journal of Microelectromechanical Systems, 26(3), 569–579. https://doi.org/10.1109/JMEMS.2017.2675452
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