Single-device and on-chip feedthrough cancellation for hybrid MEMS resonators

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number6107582
Pages (from-to)4930-4937
Journal / PublicationIEEE Transactions on Industrial Electronics
Volume59
Issue number12
Publication statusPublished - 2012

Abstract

Microelectromechanical systems (MEMS) resonators typically exhibit large parasitic feedthrough where the input drive signal is directly coupled to the output ports, presenting a challenge to full electrical characterization of resonators where the output is heavily embedded in feedthrough. We here present an on-chip solution that significantly mitigates the undesirable effects of parasitic feedthrough but using only a single device. We have demonstrated its use in a symmetrical mode of vibration (the extensional mode of a square-plate MEMS resonator) to show its applicability to most generic resonator mode shapes. In our measurements, we show that the proposed method for feedthrough cancellation provides a 40-dB common-mode rejection compared to when no feedthrough cancellation is implemented. The necessary matching of drive circuit capacitances is achieved by properly sizing and placing a dummy pad in the vicinity of each drive pad. The studies reported herein demonstrate that the integrity of the output signal from a MEMS resonator is not only determined by device dimensions but also strongly influenced by the interaction between fringing fields radiating from electrodes in proximity. These results could open up a new avenue in the design of hybrid MEMS resonant devices where the issue of feedthrough can be both effectively and cheaply addressed. © 2012 IEEE.

Research Area(s)

  • Differential configuration, feedthrough cancellation, microelectromechanical systems (MEMS), resonator