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Phase noise simulation in ring oscillator

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

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Ayrin over 13 years ago
Hi Andrew,
The version of the Cadence tool is IC6.1.5 and for MMSIM it is 7.2
I didn't try "Lorentzian", even I couldn't find it in the options of pnoise analysis

Thanks,
Armin
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Ayrin over 13 years ago
Hi Andrew,
The version of the Cadence tool is IC6.1.5 and for MMSIM it is 7.2
I didn't try "Lorentzian", even I couldn't find it in the options of pnoise analysis

Thanks,
Armin
Cancel
Vote Up 0 Vote Down

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