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Charge-Controlled Readout and BIST Circuit for MEMS Sensors

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4 Author(s)
Basith, I.I. ; Dept. of Electr. & Comput. Eng., Univ. of Windsor, Windsor, ON, Canada ; Kandalaft, N. ; Rashidzadeh, R. ; Ahmadi, M.

In this paper, we present a new readout circuit with an integrated built-in self-test (BIST) structure for capacitive microelectromechanical system (MEMS). In the proposed solution, instead of commonly used voltage control signals to test the device, charge-controlled stimuli are employed to cover a wider range of structural defects. The proposed test solution eliminates the risk of structural collapse in the test phase for gap-varying parallel-plate MEMS devices. Measurement results using a prototype fabricated in TSMC 65-nm CMOS technology indicate that the proposed BIST scheme can successfully detect minor structural defects altering MEMS nominal capacitance.

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:32 ,  Issue: 3 )