Tunability of Bulk Acoustic Wave filters using CMOS transistors: concept, design and implementation

This paper presents the feasibility of a new method to tune the Bulk Acoustic Wave - Solidly Mounted Resonator (BAW-SMR) filters by adding capacitors to the shunt resonators and by controlling these capacitors using CMOS transistors that act as switches. The tunable BAWSMR filter is realized in a la...

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Bibliographic Details
Published in2010 IEEE Radio Frequency Integrated Circuits Symposium pp. 241 - 244
Main Authors El Hassan, M, Kerherve, E, Deval, Y, David, J B, Belot, D
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2010
Subjects
Acoustic waves
Capacitors
Frequency
Insertion loss
Loss measurement
Measurement standards
passive elements
Resonator filters
SMR devices
Switches
Topology
Tunable BAW filters
Wireless LAN
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Summary:This paper presents the feasibility of a new method to tune the Bulk Acoustic Wave - Solidly Mounted Resonator (BAW-SMR) filters by adding capacitors to the shunt resonators and by controlling these capacitors using CMOS transistors that act as switches. The tunable BAWSMR filter is realized in a ladder topology. It is used for the 802.11b/g standard (2.40-2.48 GHz). Mainly, the filter fulfills the requirements for the WLAN 802.11 b/g standard, presenting a measured -3.3 dB of insertion loss, -12.7 dB of return loss and selectivity higher than 33 dB @ ±30 MHz of the bandwidth. Moreover, a measured shift of 0.5% of the centre frequency (2.44 GHz) towards higher frequencies is obtained. This tunable BAW-SMR filter has reduced dimensions (1035*1075 μm 2 ).
ISBN:9781424462407
1424462401
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2010.5477382