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Cadence simulate ring oscillator's output in frequency domain (continuous wave)

chiphead

 Hi,

Could anyone please help me with this question? 

I need to simulate my ring oscillator's output in frequency domain, showing a continuous spectrum waveform as it can be seen from spectrum analyzer in the measurement (PSS->THD is not what I want).Then I can derive Q directly from it.

If there is a detailed guide, that would be very helpful.

Thanks a lot.

 

 

Parents

  • hi Andrew,

    thanks a lot for your reply.

    noise and discrete harmonics are not what i want. since i need to simulate the output signal bandwidth of close loop ring oscillator, the continuous spectrum plot is needed. could i simulate it using cadence? i have tried pss+pac, following pss oscillator setup(select plus and minus output net as output). but the pac could not recgonize the output net as the output. by the way, i did not put any port at output node since it is oscillator.

Reply

  • hi Andrew,

    thanks a lot for your reply.

    noise and discrete harmonics are not what i want. since i need to simulate the output signal bandwidth of close loop ring oscillator, the continuous spectrum plot is needed. could i simulate it using cadence? i have tried pss+pac, following pss oscillator setup(select plus and minus output net as output). but the pac could not recgonize the output net as the output. by the way, i did not put any port at output node since it is oscillator.

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