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Method for improving ladder bulk acoustic wave filters rejection

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Abstract

This paper address design guidelines for improving the rejection of ladder bulk acoustic wave filters. An overview of the bulk acoustic wave filters technology enables to outcome the principal features of ladder filters. The lack of out-of-band rejection is currently an important weakness of this topology. The design technique presented enables to improve bulk acoustic wave ladder filters rejection by using their input/output bonding wires. Finally, the technique is used for design and fabrication of a bulk acoustic wave ladder filter for application in W-CDMA reception (2.11–2.17 GHz) front-ends. The filter measurement results show a significant improvement on the filter rejection at the transmission band (from −19 to 34 dB) and on the return loss (from −10 to −16 dB) without considerable modification of filter insertion loss and selectivity.

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Notes

  1. Capacitance given by the two parallel plates (top and bottom electrodes) and the piezoelectric layer. (C0 = ε·A/d).

References

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  4. 3GPP UE Radio Transmission and Reception (FDD) TS 25.101. http://www.3gpp.org\.

  5. Shirakawa, A. A., et al. (2006). A high isolation and high selectivity ladder-lattice BAW-SMR filter. In European Microwave Conference (pp. 905–908).

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Authors and Affiliations

  1. IMS Laboratory, CNRS UMR 5218, Bordeaux, France

    Alexandre A. Shirakawa, Moustapha El Hassan, Jean-Marie Pham, Pierre Jarry & Eric Kerhervé

  2. CEA-Leti – Minatec, Grenoble, France

    Jean-Baptiste David

  3. ST Microectronics Crolles, Crolles, France

    Fabien Dumont & Didier Belot

Authors
  1. Alexandre A. Shirakawa
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  2. Moustapha El Hassan
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  3. Jean-Marie Pham
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  4. Pierre Jarry
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  5. Eric Kerhervé
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  6. Jean-Baptiste David
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  7. Fabien Dumont
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  8. Didier Belot
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Corresponding author

Correspondence to Alexandre A. Shirakawa.

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Shirakawa, A.A., El Hassan, M., Pham, JM. et al. Method for improving ladder bulk acoustic wave filters rejection. Analog Integr Circ Sig Process 55, 69–75 (2008). https://doi.org/10.1007/s10470-008-9155-z

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  • DOI: https://doi.org/10.1007/s10470-008-9155-z

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