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Phase response of injection locked ring oscillator

SSMQuery

Hi,

I have designed a first harmonic injection locked quadrature oscillator (First harmonic means -  input and output are at the same frequency. It is not a divider).  It accepts a differential input and produces quadrature outputs at the same frequency. I need to measure quadrature accuracy of the output and injection locking range of oscillator. Can any one help me finding out locking range and quadrature accuracy? 

  • Dear SSMQuery,

    SSMQuery said:
    Can any one help me finding out locking range and quadrature accuracy? 

    Transient analyses are generally the best analyses to use since you are interested in the lock range. Hence, you will be applying an injection source were its frequency will not simulate an oscillation. However, wthin the lock range, you may be able to use a pss analysis. Cadence  provided some guidance for an injection locked based RC VCO at the On-line support URL:

    https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nU0KEAU&pageName=ArticleContent

    As far as measuring the quadrature accuracy, a combination of cross(0) functions is a means of creating an expression for the quadrature clock phase errors of the steady-state injection locked oscillator.

    The simulation of the lock range of an injection locked oscillator is not a trivial set of  simulations and requires some time. Keep in mind that once locked, the lock range may extend beyond the ramge you measure prior to it phase locking to an external stimuli.

    Good luck SSMQuery!

    Shawn

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