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Online sensor testing through superposition of encoded stimulus.

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published

Publication date04/2007
Host publicationProceedings of the Design, Test, Integration and Packaging of MEMS/MOEMS, Stresa, Lago Maggiore, Italy, 25-27 April 2007.
Number of pages6
Original languageEnglish

Conference

ConferenceDesign, Test, Integration and Packaging of MEMS and MOEMS (DTIP 2007)
CityStresa, Italy
Period25/04/0727/04/07

Conference

ConferenceDesign, Test, Integration and Packaging of MEMS and MOEMS (DTIP 2007)
CityStresa, Italy
Period25/04/0727/04/07

Abstract

Online monitoring remains an important requirement for a range of microsystems. The solution based on the injection of an actuating test stimulus into the bias structure of active devices holds great potential. This paper presents an improved solution that aims to remove the measurand-induced signal from the sensor output. It involves encoding the test stimulus and using a covariance algorithm to reject the signal that does not contain the code. The trade-off between the sine wave rejection ratio of the technique and the test time response is studied and, in the case of a MEMS accelerometer, it is demonstrated that the rejection is higher than 14dB for a test time of about 0.7s. Furthermore, the accuracy of the test signal can be evaluated to guarantee the integrity of the online test output.

Bibliographic note

http://tima.imag.fr/conferences/dtip/