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on subharmonic injection VCO phase noise analysis setup

Ruixin

Hi, ALL, 

I am designing a 1GHz ring oscillator injected by 100 MHz injection pulse.

The ring oscillator's free running frequency is 1 GHz.

I use Vpulse to generate 100 MHz injection signal.

How should I setup in PSS and Pnoise to measure the phase noise of ring oscillator?

It would be much appreciated if anyone can help with this problem.

Ruixin     

  • If this is injection locked (i.e. it means that the ring oscillator ends up with a fixed frequency, presumably a harmonic of the 100MHz injection signal), then you would simulate this as a driven circuit (i.e. don't check the "oscillator" checkbox) and specify the PSS fundamental as 100MHz.

    Regards,

    Andrew.

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