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Monolithic above-IC resonator technology for integrated architectures in mobile and wireless communication

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8 Author(s)
Dubois, M. ; Swiss Center for Electron. & Microtechnol., Neuchatel, Switzerland ; Carpentier, J.-F. ; Vincent, P. ; Billard, Christophe
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This paper demonstrates the feasibility of an above-IC bulk acoustic wave technology for wireless applications. A double-lattice bulk acoustic wave (BAW) filter with balanced input and output has been designed and integrated as a post-process directly above 0.25 μm BiCMOS wafers comprising RF circuits. This filter, featuring moderate insertion loss of -3dB and extreme out-of-band rejection (>-50 dB) is used in a simplified RF front-end receiver for the WCDMA standard, as well as in a new type of filtering LNA comprising two broadband amplifiers and one BAW filter.

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Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 1 )