Microgyroscope control system using a high-order band-pass continuous-time sigma-delta modulator

作者：Dong Y^*; Kraft M; Hedenstierna N; Redman White W

来源：Sensors and Actuators A: Physical , 2008, 145: 299-305.

DOI：10.1016/j.sna.2007.10.057

• band-pass
• closed loop control
• gyroscope
• MEMS
• sigma-delta

The paper presents a novel 6th order continuous-time, force-feedback band-pass sigma-delta modulator control system for the detection 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 four times of mechanical resonant frequency, 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.

• 出版日期2008-8