RF Design Forums

Injection lock vco

asrf
2 months ago

Hi all,

Is there any guide that helps me simulate an injection locked vco ?

All I know for now is: run a transient simulation and let my oscillator reach the steady state and then I use a switch to connect the Injection voltage using a varactor and wait for it to lock to finj.

How can I obverse the final fundamental tone using pss ? Can I observe phase noise using pnoise simulation ?

Do pss and pnoise work with switch component ?

This is what I am planning to do. Using a switch to connect the injection signal to VCO using two varactors.

Thank you. I appreciate your time and effort.

Parents
  • 2 months ago

    There's this article which might be useful: Tips for simulating injection locked ring oscillator (thanks to ).

    Yes, you can use the switch component and have it change position during the Transient Assist (tstab) phase of the PSS. You'd need to ensure that the control for the switch is driven by a non-periodic source - so a pulse source without a period specified would suffice. Provded that this has switched before the end of the tstab (and ideally with sufficient time for the oscillator to lock), you would then need to simulate the PSS as a driven circuit because the oscillator is locked to your 4.5G source above (see the article).

    Andrew.

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