A 0.1-to-1.2GHz tunable 6th-order N-path channel-select filter with 0.6dB passband ripple and +7dBm blocker tolerance

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    Radio receivers should be robust to large out-of-band blockers with small degradation in their sensitivity. N-path mixers can be used as mixer-first receivers [1] with good linearity and RF filtering [2]. However, 1/f noise calls for large active device sizes for IF circuits and high power consumption. The 1/f noise issue can be relaxed by having RF gain. However, to avoid desensitization by large out-of-band blockers, a bandpass filter (BPF) with sharp cut-off frequency is required in front of the RF amplifiers. gm-C BPFs suffer from tight tradeoffs among DR, power consumption, Q and fc. Also, on-chip Q-enhanced LC BPFs [3] are not suitable due to low DR, large area and non-tunability. Therefore, bulky and non-tunable SAW filters are used. N-path BPFs offer high Q while their center frequency is tuned by the clock frequency [2]. Compared to gm-C filters, this technique decouples the required Q from the DR. The 4-path filter in [4] has only 2nd-order filtering and limited rejection. The order and rejection of N-path BPFs can be increased by cascading [5], but this renders a “round‿ passband shape. The 4th-order 4-path BPF in [6] has a “flat‿ passband shape and high rejection but a high NF. This work solves the noise issue of [6] while achieving the same out-of-band linearity and adding 25dB of voltage gain to relax the noise requirement of the subsequent stages.
    Original languageEnglish
    Title of host publicationIEEE International Solid-State Circuits Conference Digest of Technical Papers, ISSCC 2013
    Place of PublicationPiscataway
    Number of pages2
    ISBN (Print)978-1-4673-4515-6
    Publication statusPublished - 19 Feb 2013
    EventIEEE International Solid-State Circuits Conference, ISSCC 2013 - San Francisco, United States
    Duration: 17 Feb 201321 Feb 2013

    Publication series

    PublisherIEEE Press
    ISSN (Print)0193-6530


    ConferenceIEEE International Solid-State Circuits Conference, ISSCC 2013
    Abbreviated titleISSCC
    Country/TerritoryUnited States
    CitySan Francisco


    • EWI-23441
    • METIS-297700
    • IR-86301


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