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PNoise Analysis of ILO

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Engineer4ever

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Hello,

I am running PNoise analysis for my Injection-locked oscillator before and after injection. Before injection, it's just a VCO, and in SweepType field, I choose "relative". However, when I inject a signal, "relative" option gets me the same PNoise of the VCO, which is not reasonable. My question is, since ILO is a driven circuit, should Sweeptype be "Absolute" or "default", especially as their results are very reasonable? and what are the difference between the three options?

Thanks,

Screenshot.png
 

See pnoise statement in netlist.
Also see logfile of spectre.

Thank you so much :)

I have one more question just to make sure I do it right: I inject my circuit with a 5-GHz signal and the o/p is 1GHz. Does it mean Sweeptype is "relative" in this case or still "absolute" as the circuit is actually driven?
 
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I inject my circuit with a 5-GHz signal and the o/p is 1GHz.
What do you mean by "o/p" ?

Does it mean Sweeptype is "relative" in this case
or still "absolute" as the circuit is actually driven?
I can not understand what you want to mean at all.
However if your analysis is a PSS analysis with fundamental_frequency=1GHz, it is a driven PSS analysis.

Why do you relay on default setting in Pnoise ?
Simply set sweeptype as relative or absolute clearly without using default.
That's all.


And you can confirm actual sweeptype used for Pnoise in Spectre logfile.
Surely see logfile of Spectre.
 
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Thanks for your reply.

What do you mean by "o/p" ?

By "o/p" I mean the o/p of the ILO. I inject the VCO with a 5-GHz and since it's a 5-stage super-harmonic ILO, its o/p is 1GHz.
 

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