Integrated radio frequency circuits for wideband receivers

Mikko Kaltiokallio

    Research output: ThesisDoctoral ThesisCollection of Articles

    Abstract

    The multisystem, multiband problem in mobile terminals drives up the cost and complexity of the radios by requiring separate dedicated signal paths with discrete filtering. By removing the filters, the radios could be made more cost-efficient and flexible, and the signal path design would be simplified. However, in receivers, this demands that the front-end is capable of withstanding an extremely harsh interference environment while providing good sensitivity. This thesis concentrates on improving and developing receiver circuits that provide a wide reception bandwidth and tolerance against blockers. Wideband receiver circuits are an attractive option to implement the future resource sharing radios with less dedicated hardware. A wideband dual-loop feedback LNA implemented in this work enables simultaneous matching and flat gain response over a 1.6 GHz reception bandwhile only requiring a single inductor in the shunt-peeked load of the LNA. The use of awideband LNA in a 60 GHz receiver has also been demonstrated. Additionally, wideband buffering circuits are reviewed and compared in this thesis. The fast switching speed of the CMOS technology acts as the key enabler for the research performed in this work. One structure that utilizes this property is the N-path filter, which has been extensively utilized in the circuits presented. A feedback N-path filter in a wideband 2-to-6-GHz LNA has been implemented and analyzed. The analysis provides the evaluation of different design trade-offs and a guide to design such a system. Another circuit to use the N-pathfilter is the 0.7-to-2.7-GHz mixer-first receiver that was implemented together with a wideband CCE antenna. The work highlights the key challenges when wideband interfaces are implemented and suggests a solution to circumvent part of the challenges. The integrated circuit includes low-noise and low-distortion baseband stages to provide good overall performance. Additionally, the circuit demonstrates a novel duty-cycle control circuit fortuning the mixer-first receiver performance. This thesis also includes an analysis and implementation of an active polyphase filter for LO quadrature generation. The analysis provides means for designing stable two-stage APPFs withoptimal gain, image rejection ratio and bandwidth while being stable. This is demonstrated in a 1-to-5-GHz APPF that was implemented
    Translated title of the contributionRadiotaajuisia mikropiirejä laajakaistaisiin vastaanottimiin
    Original languageEnglish
    QualificationDoctor's degree
    Awarding Institution
    • Aalto University
    Supervisors/Advisors
    • Ryynänen, Jussi, Supervising Professor
    Publisher
    Print ISBNs978-952-60-5615-9
    Electronic ISBNs978-952-60-5616-6
    Publication statusPublished - 2014
    MoE publication typeG5 Doctoral dissertation (article)

    Keywords

    • radio receiver
    • mixer-first receiver
    • blocker tolerant
    • wideband LNA
    • duty-cycle control
    • active polyphase filter
    • wideband buffer

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