Hi Everyone,

I was about to create a VerilogA model for a VCO, which includes the phase noise as well. I used the model in Listings 1 from http://www.designers-guide.org/Analysis/rf-sim.pdf.

The problem is that there is no noise in pnoise measurement. The pnoise setup is the same as for a transistor level VCO, so it has to be good. On the other hand transient noise simulation shows variance between iterations, which indicates that the verilogA code's phase noise solution works.

So my question is what do I need to do to get a pnoise output?

If you need more information or just want to look at my setup, you find them below:
Code:

analysis('pnoise ?sweeptype "relative"  ?relharmnum "1"  ?start "10"  
		?stop "1G"  ?maxsideband "7"  ?p "/out"  ?n "/gnd!"  
		?oprobe ""  ?noisetype "timeaverage"  ?noiseout list("pm")  ?noisetypeUI ""  
		?osc_version ""  ?osc_accuracy ""  ?ppv ""  )
analysis('pss ?fund "61.25G"  ?harms "7"  ?errpreset "conservative"  
		?tstab "20p"  ?oscana t  ?p "/out"  ?n "/gnd!"  
		?oscic "lin"  ?ppv ""  )
run()
output\ noise\:\ \(PM\,\ SSB\,\ dBc\/Hz\) = rfOutputNoise("dBc/Hz" ?result "pnoise_pm" ?noiseConvention "SSB")
plot( output\ noise\:\ \(PM\,\ SSB\,\ dBc\/Hz\) ?expr '( "output noise: (PM, SSB, dBc/Hz)" ) ) 

Code:

	analog begin
		phase = 2* `M_PI*freq * $abstime;
		phase_noise = flicker_noise(pn,2);
		//f_noise = flicker_noise(pn*corner_1f,3);
		//V(out) <+ ampl*cos(phase + phase_noise + f_noise);
		//V(out) <+ ampl*cos(phase + phase_noise);
		V(out) <+ ampl*cos(phase);
		V(out) <+ phase_noise;
        end
 

Thanks cheap_salary! You are right, I have now a source, not an oscillator. Also thanks for the link! I did not had the rfLib in my Library Manager, now I searched it, and added it.

I tried your code, but I got an error for the first line. Since there was a oscillator in rfLib which suits my needs I did not dive into that line or the code in rfLib. I will look into it later.