Towards low power N-Path filters for flexible RF-Channel selection

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    N-path filters can offer high-linearity high-Q channel selection filtering at a flexibly programmable RF center frequency, which is highly wanted for Software Defined Radio. Relying on capacitors and MOSFET switches, driven by digital non-overlapping clocks, N-path filters fit well to CMOS and benefit from Moore’s law. The basis of this filtering is the linear periodically time variant (LPTV) behaviour of a switch-R-C series circuit, which realizes frequency translated filtering, where a baseband filter characteristic is shifted around the switching frequency. This paper reviews the basic concept of N-path filters and recent developments, with special attention to possibilities to reduce power consumption by increasing the impedance level. The basic operation of the switch-R-C kernel that is at the core of N-path filtering is reviewed in terms of transfer function and noise performance.
    Original languageUndefined
    Title of host publication24th Workshop on Advances in Analog Circuit Design, AACD 2015
    Place of PublicationSwitserland
    Number of pages20
    ISBN (Print)978-3-319-21184-8
    Publication statusPublished - 22 Apr 2015
    Event24th Workshop on Advances in Analog Circuit Design, AACD 2015 - Neuchatel, Switzerland
    Duration: 21 Apr 201523 Apr 2015
    Conference number: 24

    Publication series

    NameEfficient Sensor Interfaces, Advanced Amplifiers and Low Power Systems


    Conference24th Workshop on Advances in Analog Circuit Design, AACD 2015
    Abbreviated titleAACD


    • EWI-26930
    • METIS-316882
    • IR-100198

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