Using MEMS Capacitive Switches in Tunable RF Amplifiers

  • John Danson1Email author,

    Affiliated with

    • Calvin Plett1 and

      Affiliated with

      • Niall Tait1

        Affiliated with

        EURASIP Journal on Wireless Communications and Networking20062006:016518

        DOI: 10.1155/WCN/2006/16518

        Received: 15 October 2005

        Accepted: 14 March 2006

        Published: 16 May 2006

        Abstract

        A MEMS capacitive switch suitable for use in tunable RF amplifiers is described. A MEMS switch is designed, fabricated, and characterized with physical and RF measurements for inclusion in simulations. Using the MEMS switch models, a dual-band low-noise amplifier (LNA) operating at http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq1_HTML.gif GHz and http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq2_HTML.gif GHz, and a tunable power amplifier (PA) at http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq3_HTML.gif GHz are simulated in http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq4_HTML.gif http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq5_HTML.gif m CMOS. MEMS switches allow the LNA to operate with 11 dB of isolation between the two bands while maintaining http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq6_HTML.gif dB of gain and sub- http://static-content.springer.com/image/art%3A10.1155%2FWCN%2F2006%2F16518/MediaObjects/13638_2005_Article_1207_IEq7_HTML.gif dB noise figure. MEMS switches are used to implement a variable matching network that allows the PA to realize up to 37% PAE improvement at low input powers.

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        Authors’ Affiliations

        (1)
        Department of Electronics, Carleton University Ottawa

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        Copyright

        © John Danson et al. 2006

        This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.