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Phase noise simulation in ring oscillator

Ayrin

I have two questions regarding the phase noise simulation results (PSS + Pnoise) for ring oscillators:

(1) How much the precision of the initial oscillation frequency is important in estimating phase noise ?

(2) The results that I get for the phase noise seems a bit high. I feel there is a shift up in all the frequencies. In very low frequencies (close to carrier) the phase noise is largely positive. Comparing with the analysis presented in [Abidi, JSSC 2006] the phase noise sounds very high. Does someone has any idea that what could be wrong?

 

The ring oscillator designed to oscillate at 2.4 GHz using CML gates with a tail bias current of about 200 uA. 

 

Thanks in advance for your help.

 

Armin

 

Parents

  • Hello Smlogan and Andrew,

     

    Thank you very much for your replies and hints. I will try again with the new settings and will report the results. However in general it seems to me very strange that the results are so much better when I select only one of the two outputs of the differential ring oscillator as the ouptut node in the pnoise simulation. Compared to the case that I select the differential outputs in the pnoise analysis, the difference is very large.

     

    Thanks again,

     

    Armin

Reply

  • Hello Smlogan and Andrew,

     

    Thank you very much for your replies and hints. I will try again with the new settings and will report the results. However in general it seems to me very strange that the results are so much better when I select only one of the two outputs of the differential ring oscillator as the ouptut node in the pnoise simulation. Compared to the case that I select the differential outputs in the pnoise analysis, the difference is very large.

     

    Thanks again,

     

    Armin

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