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positive pnmx encountered for push-push oscillator in ads

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ring119

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I'm designning a 60GHz push-push VCO in ads. When set the noise ports as differential nodes (@30GHz) in HB noise controller, correct phase noise (pnmx) is given, around -70dBc@1MHz offset. But when set the noise port as single-ended (@60GHz), i got positive pnmx value... I've changed the osc port direction and location, but they didn't work... Is this related to HB simulation setup? Anyone got any idea? Thanks a lot.
 

The problem is that the noise is computed around the fundamental frequency (@30 GHz in your case). So, as there´s no signal at this frequency (ideal push-push), the SNR is positive and does not signify nothing. I have the same problem and would like to know if it´s possible to get the phase noise around the second harmonic with Agilent ADS.
Anybody knows ?
 

See the followings.
The Designer's Guide Community Forum - phase noise of ring oscillator using spectre
The Designer's Guide Community Forum - phase noise of ring oscillator using spectre
The Designer's Guide Community Forum - Phase noise analysis of autonomous ring oscillator

wighou said:
would like to know if it´s possible to get the phase noise around the second harmonic with Agilent ADS.
Click to expand...
Yes, of course it's possible.
Use "Noise Controler" instead of "Noise Analysis" of HB Analysis controller.
 
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    wighou

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True, thank you for your help Pancho
 

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