A 4th-order band-pass filter using differential readout of two in-phase actuated contour-mode resonators

H. Yagubizade, M. Darvishi, Michael Curt Elwenspoek, Niels Roelof Tas

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    6 Citations (Scopus)


    A 4th-order band-pass filter (BPF) based on the subtraction of two 2nd-order contour-mode Lamb-wave resonators is presented. The resonators have slightly different resonance frequencies around 380 MHz. Each resonator consists of a 500 nm pulsed-laser deposited lead zirconate titanate (PZT) thin-film on top of a 3 μm silicon (PZT-on-Si). The resonators are actuated in-phase, and their outputs are subtracted. Utilizing this technique, the feed-through signals are eliminated while the outputs of the resonators are added up constructively, due to the phase difference between the two output signals. The BPF is presented using 50 Ω termination with a bandwidth of approximately 3.9 MHz and 43 dB stopband rejection. This technique provides further opportunities for MEMS filter design in addition to existing methods, i.e., mechanical and/or electrical coupling. It also resolves the design issue associated with high feed-through when exploiting piezoelectric materials with high-dielectric constant like PZT.
    Original languageUndefined
    Pages (from-to)173517
    Number of pages4
    JournalApplied physics letters
    Issue number17
    Publication statusPublished - 24 Oct 2013


    • EWI-23875
    • Band-pass filter
    • High frequency
    • IR-87577
    • Resonator
    • PZT
    • METIS-300110
    • RF MEMS

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