Pascal Zwahlen

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In this paper, we report a Sigma-Delta MEMS navigation grade accelerometer, which, to our knowledge, is the first reported MEMS accelerometer to reach navigation grade performances. This reported system encompasses a high stability and high shock resistance mechanical MEMS sensor, a 5<sup>th</sup>-order sigma-delta closed-loop electronic with digital loop(More)
This paper presents a 5<sup>th</sup>-order &#x0394;&#x03A3; capacitive accelerometer. The &#x0394;&#x03A3; loop is implemented in mixed signal, the global 5<sup>th</sup>-order filter having a 2<sup>nd</sup>-order analog and a 3<sup>rd</sup>-order digital part. The system can be used with a wide range of sensors, because the mixed-signal front end is(More)
So far MEMS inertial accelerometers has struggled to reach tactical grade quality only and their bias stability and thermal drift are still obstacles to be overcome for inertial navigation systems. This paper reports on an ultrahigh precision MEMS closed-loop accelerometer recently developed by Colibrys, and the focus is on long term bias stability and(More)
Traditional inertial grade accelerometers, based on vibrating quartz structures, which have excellent dynamic range, are vital components in avionics. However, such kinds of accelerometers suffer from high cost and exhibit post-shock stability degradation in particular high-shock, high-vibration environments. MEMS fabrication process is an inherently rugged(More)
This paper reports on a high performance navigation grade MEMS servo accelerometer targeted at inertial applications. Reported results are for a bulk MEMS capacitive sensor with 11g full scale over a 300 Hz bandwidth interfaced with a highly optimized servo-loop 5<sup>th</sup>-order sigma-delta electronic. Measurements demonstrate a long-term bias stability(More)
MEMS accelerometers have proven high reliability, cost-effectiveness and versatility in recent years for consumer grade applications. Sagem and Colibrys have long been involved in MEMS accelerometers, with the ACSIL sensor that has been around for over 20 years on APIRS Attitude and Heading Reference Systems and more recently the MS90xx product family. MEMS(More)
This paper presents a MEMS-based 5<sup>th</sup>-order &#x0394;&#x03A3; capacitive accelerometer. The &#x0394;&#x03A3; loop is implemented in mixed signal, the global 5<sup>th</sup>-order filter having a 2<sup>nd</sup>-order analog and a 3<sup>rd</sup>-order digital part. The system can be used with a wide range of sensors, because the mixed-signal front-end(More)
This article reviews the two accelerometer platforms Colibrys has developed: open-loop and closed-loop platforms. Both of them are set to be best-in-class in their respective markets. With these two platforms Colibrys is further strengthening its market leader position into the high performance applications. A full review of the MEMS, the packaging, the(More)