Bulk acoustic wave filters synthesis and optimization for multi-standard communication terminals

Giraud, Sylvain; Bila, Stéphane; Chatras, Matthieu; Cros, Dominique; Aubourg, Michel

doi:10.1109/tuffc.2010.1378

Cited by 16 publications

(9 citation statements)

References 12 publications

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“…These filters are not tunable, and thus require one duplexer per frequency constellation. Two main variants of bulk acoustic wave filter are thin film bulk acoustic resonator, or FBAR, and solid mounted bulk acoustic resonators [167]. These signals are generated by the transmit signal leaking into the receiver and an external interferer in a certain frequency band, thus degrading sensitivity of the entire receiver.…”

Section: Lte/lte-advanced Operating Frequencies and Band Classesmentioning

confidence: 99%

“…These signals are generated by the transmit signal leaking into the receiver and an external interferer in a certain frequency band, thus degrading sensitivity of the entire receiver. The surface acoustic wave filters are limited to frequencies up to 3 GHz [167]. In general, it is not trivial to design extremely broadband RF filters, power or low-noise amplifiers, mixers, etc., to cover a number of contiguous and/or non-contiguous RF bands with optimal performance across the entire operating bands.…”

Section: Lte/lte-advanced Operating Frequencies and Band Classesmentioning

confidence: 99%

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Downlink Physical Layer Functions

Ahmadi¹

2014

LTE-Advanced

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Section: Lte/lte-advanced Operating Frequencies and Band Classesmentioning

confidence: 99%

Section: Lte/lte-advanced Operating Frequencies and Band Classesmentioning

confidence: 99%

Downlink Physical Layer Functions

Ahmadi¹

2014

LTE-Advanced

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“…To perform single-ended to balanced transformation, a balun is placed after a ladder filter, which adds considerable insertion loss (typically 0.51 dB) to the filter. An alternative type of BAW filter is of a lattice structure, which is frequently used to address fully differential filtering [8]. A balun is placed before a lattice filter to fulfill the desired single to balanced transformation.…”

Section: New Topology Of Single To Balanced Filtermentioning

confidence: 99%

A Novel Single-Ended to Balanced Bulk Acoustic Wave Filter for Wireless Communications

Zhang

2011

IEEE Microw. Wireless Compon. Lett.

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This letter presents a new architecture of BAW filter with single-ended to balanced mode conversion. The single-ended to balanced BAW filter comprises a single-ended ladder section at the filter input, a fully balanced lattice section at the output, and a balun in the middle to couple the two sections electrically. By taking full advantage of the characteristics of ladder and lattice structures respectively, a single to balanced filter with low insertion loss, steep near-band skirts and deep out-of-band attenuations can be achieved. As an optimal implementation the ladder, the capacitors in the balun and the lattice sections have been fabricated on a single die. The measurement results demonstrate that the proposed new architecture can deliver a single to balanced mode conversion with an ideal combination of performance, size, and functionality in a filter or a duplexer for wireless communications.

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“…Acoustic filters are among the most compact devices that can be used for RF communication systems [1][2][3], and recent improvements of composite MEMS resonators enable to achieve very high quality factors Q, allowing for low-imprint devices and operating frequencies as high as 8 GHz [4] [5]. A lot of research efforts were focused on bulk acoustic wave (BAWs) [6][7][8] devices which offered many potentialities for smart RF components or systems, especially as an alternative to surface acoustic waves (SAWs) filters [9] [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of acoustic wave micro-resonators integrating piezoelectric zinc oxide layers

Mortada

Zahr

Orlianges

et al. 2017

Journal of Applied Physics

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International audienceThis paper reports on the design, simulation, fabrication and test results of ZnO-based contour-mode micro-resonators integrating piezoelectric zinc oxide (ZnO) layers. The inter-digitated (IDTs) type micro-resonators are fabricated on ZnO films and suspended top of 2µm thick silicon membranes using silicon-on insulator (SOI) technology. We analyze several possibilities of increasing the quality factor (Q) and the electromechanical coupling coefficient (k t 2) of the devices by varying the numbers and lengths of the IDTs electrodes and using different thicknesses of the ZnO layer. We designed and fabricated IDTs of different finger numbers (n=25, 40, 50 and 80) and lengths (L=100/ 130/ 170/ 200 µm) for three different thicknesses of ZnO films (200, 600 and 800 nm). The measured Q factor confirms that reducing the length and the number of IDTs fingers enables to reach better electrical performances at resonant frequencies around 700 MHz. The extracted results for an optimized micro-resonator device having a IDTs length of 100 μm and 40 finger electrodes, show a Q of 1180 and a k t 2 of 7.4%. We demonstrate also that the reduction of the ZnO thickness from 800 nm to 200 nm increases the quality factor from 430 to 1600 respectively, around 700 MHz. Experimental data are in very good agreement with theoretical simulations of the fabricated device

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Bulk acoustic wave filters synthesis and optimization for multi-standard communication terminals

Cited by 16 publications

References 12 publications

Downlink Physical Layer Functions

Downlink Physical Layer Functions

A Novel Single-Ended to Balanced Bulk Acoustic Wave Filter for Wireless Communications

Analysis and optimization of acoustic wave micro-resonators integrating piezoelectric zinc oxide layers

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