Trade-off between phase-noise and signal quadrature in unilaterally coupled oscillators

Torsten Djurhuus, Viktor Krozer, Jens Vidkjær, Tom Keinicke Johansen

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    Abstract

    We present a comprehensive nonlinear analysis of coupled oscillators and examine the trade-off between phase-noise of the oscillator and the quadrature precision. We show that asymmetry gives rise to amplitude and phase imbalance which are proportional to the inverse and inverse square, respectively, of the relative coupling strength. It is shown that the level of AM-PM is determined by the nonlinearity of the coupling transconductance. The 3dB noise reduction in close-to-carrier phase-noise in quadrature oscillators due to mutual coupling is lost to the extra AM-PM noise for large coupling strengths. The additional contribution of the internal noise sources in the coupling circuit together with the AM-PM noise contribution explains why the 3dB noise reduction is rarely seen in measurements of this particular circuit.
    Original languageEnglish
    Title of host publicationMicrowave Symposium Digest, 2005 IEEE MTT-S International
    PublisherIEEE
    Publication date2005
    Pages883-886
    ISBN (Print)07-80-38846-1
    DOIs
    Publication statusPublished - 2005
    Event2005 IEEE MTT-S International Microwave Symposium - Long Beach, United States
    Duration: 12 Jun 200517 Jun 2005
    https://ieeexplore.ieee.org/xpl/conhome/10171/proceeding?isnumber=32491

    Conference

    Conference2005 IEEE MTT-S International Microwave Symposium
    Country/TerritoryUnited States
    CityLong Beach
    Period12/06/200517/06/2005
    Internet address

    Bibliographical note

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