y7wu
Newbie level 6
how much phase at 0db
Hi all,
I'm simulating a differential ring oscillator with 10 stages in cadence
I'm using PSS to determine oscillation frequency then Pnoise to get the phase noise.
I seem to be getting some very strange results where the phase noise has positive dBc/Hz from relative frequency of 1Hz to 1kHz from my oscillation frequency of 2.4Ghz. This seems crazy because from the way phase noise is defined it is not possible to get it over 0dB. Am I correct?. The phase noise in V/sqrt(Hz) is in the Kilovolts range. I always thought noise sources such as shot noise and thermal noise is tiny in magnitude
What can I be doing wrong?
I've attached an image as well as the settings i used for PSS and Pnoise.
Thank you so much in advance
Hi all,
I'm simulating a differential ring oscillator with 10 stages in cadence
I'm using PSS to determine oscillation frequency then Pnoise to get the phase noise.
I seem to be getting some very strange results where the phase noise has positive dBc/Hz from relative frequency of 1Hz to 1kHz from my oscillation frequency of 2.4Ghz. This seems crazy because from the way phase noise is defined it is not possible to get it over 0dB. Am I correct?. The phase noise in V/sqrt(Hz) is in the Kilovolts range. I always thought noise sources such as shot noise and thermal noise is tiny in magnitude
What can I be doing wrong?
I've attached an image as well as the settings i used for PSS and Pnoise.
Thank you so much in advance
