A 0.3-to-1.2GHz tunable 4th-order switched gm-C bandpass filter with >55dB ultimate rejection and out-of-band IIP3 of +29dBm

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    Abstract

    The trend towards reconfigurable receivers requires on-chip flexible filters that can replace dedicated, bulky and non-tunable filters (e.g., SAW and BAW [1]). Although BAW filters are compatible with silicon processes, their center frequency is sensitive to thickness variation of the piezoelectric material and the achievable tuneability is limited [1]. Other techniques to make RF on-chip band-pass filters (BPFs) include Q-enhancement, gm-C and N-path. Q-enhancement approach has several disadvantages such as large area due to inductors which do not obey process scaling, limited tuneability and poor dynamic range [2]. Main drawbacks of gm-C filters are the tradeoff between power consumption, quality factor, center frequency and dynamic range and the need for tuning circuitry [3]. Recently there has been renewed interest in the translational impedance conversion of N-path filters [4-6]. Due to the “transparency‿ of the passive mixer, baseband impedance is translated to frequencies around the clock frequency flo [7]. The interesting features of these filters are their direct tuneability with flo, higher quality factor compared to on-chip CMOS LC filters [2], high linearity and graceful scaling with process.
    Original languageEnglish
    Title of host publication2012 IEEE International Solid-State Circuits Conference
    Place of PublicationPiscataway
    PublisherIEEE
    Pages358-360
    Number of pages3
    ISBN (Print)978-1-4673-0376-7
    DOIs
    Publication statusPublished - 22 Feb 2012
    EventIEEE International Solid-State Circuits Conference, ISSCC 2012 - San Francisco, United States
    Duration: 19 Feb 201223 Feb 2012

    Conference

    ConferenceIEEE International Solid-State Circuits Conference, ISSCC 2012
    Abbreviated titleISSCC
    CountryUnited States
    CitySan Francisco
    Period19/02/1223/02/12

    Keywords

    • METIS-286346
    • EWI-21815
    • IR-80302

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