An Intrinsically Switchable Ladder-Type Ferroelectric BST-on-Si Composite FBAR Filter

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Seungku Lee, Amir Mortazawi

Abstract

This paper presents a ladder-type bulk acoustic wave (BAW) intrinsically switchable filter based on ferroelectric thin-film bulk acoustic resonators (FBARs). The switchable filter can be turned on and off by the application of an external bias voltage due to the electrostrictive effect in thin-film ferroelectrics. In this paper, Barium Strontium Titanate (BST) is used as the ferroelectric material. A systematic design approach for switchable ladder-type ferroelectric filters is provided based on required filter specifications. A switchable filter is implemented in the form of a BST-on-Si composite structure to control the effective electromechanical coupling coefficient of FBARs. As an experimental verification, a 2.5-stage intrinsically switchable BST-on-Si composite FBAR filter is designed, fabricated, and measured. Measurement results for a typical BST-on-Si composite FBAR show a resonator mechanical quality factor (Q(m)) of 971, as well as a (Q(m)) × f of 2423 GHz. The filter presented here provides a measured insertion loss of 7.8 dB, out-of-band rejection of 26 dB, and fractional bandwidth of 0.33% at 2.5827 GHz when the filter is in the on state at a dc bias of 40 V. In its off state, the filter exhibits an isolation of ...Continue Reading

References

Jul 29, 2005·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Kenneth M Lakin
Sep 26, 2012·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·George N Saddik, Robert A York
Jan 30, 2014·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Seyit Ahmet SisAmir Mortazawi

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