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Microgyroscope Control System using a High-Order Band-Pass Continuous-Time Sigma-Delta Modulator

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4 Author(s)
Dong, Y. ; Southampton Univ., Southampton ; Kraft, M. ; Hedenstierna, N. ; Redman-White, W.

The paper presents a novel 6th order continuous-time, force-feedback band-pass sigma-delta modulator control system for the sense mode of micromachined vibratory gyroscopes. Compared with the architecture using a low-pass sigma-delta modulator, this band-pass solution uses a much lower sampling frequency for the sigma-delta modulator and thus reduces the requirement for frequency response of the detection interface and control electronics. In this work, the sigma-delta modulator operates at only 40 kHz which allowed its implementation in a continuous-time circuit using discrete electronic components on a PCB; this has the advantage of simple prototyping and can improve the signal anti-aliasing characteristics.

Published in:

Solid-State Sensors, Actuators and Microsystems Conference, 2007. TRANSDUCERS 2007. International

Date of Conference:

10-14 June 2007