Frequency modulation technique for MEMS resistive sensing

Ali Mohammadi, Mehmet Rasit Yuce, S. O. Reza Moheimani

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Frequency modulation technique can be applied to microelectromechanical systems (MEMS) transducers that require some form of resistive sensing. For example, electrothermal sensing is being investigated as a viable means of measuring displacement in micromachined transducers. This paper proposes a highly sensitive readout circuit, which can convert 10 Ω change of resistance in a 400 Ω electrothermal sensor to more than 200 kHz frequency variation (350-550 KHz). The frequency variations are then converted to voltage values by means of a frequency demodulation. In addition, the proposed technique achieves high linearity from the voltage applied to the actuator to the voltage measured at the sensor's output, which can potentially eliminate the need for an additional linearization if the sensor is used in a feedback loop. The proposed approach leads to high sensitivity in the MEMS electrothermal sensing since the method is not affected by amplitude variations that could arise from the readout circuit.

Original languageEnglish
Article number6204308
Pages (from-to)2690-2698
Number of pages9
JournalIEEE Sensors Journal
Volume12
Issue number8
Early online date24 May 2012
DOIs
Publication statusPublished - 31 Aug 2012

Keywords

  • Electrothermal sensing
  • frequency modulation
  • linearity
  • microelectromechancial systems

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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