k_p610 wrote on May 19th, 2009, 10:35pm:I have following query in pnoise :
What vendor's simulator do you mean ?
There are many simulators which have analysis called as Pnoise.
I assume Pnoise of Cadence Spectre.
k_p610 wrote on May 19th, 2009, 10:35pm:From above result can I interprete that the noise across capacitor is 3.6uV when clock is high?
I don't think so.
k_p610 wrote on May 19th, 2009, 10:35pm:2. In "sources" all the noise sources are assumed non-correlated unlike "timedomain".
I can't understand what you mean.
"sources" is completely same as "timedomain" regarding correlations of noises.
Shaping of noise in time domain cause correlation of noises in frequency domain.
This is true for both "sources" and "timedomain" in Pnoise of Cadence Spectre.
Both "sources" and "timedomain" are no more than small signal analysis in frequency domain.
k_p610 wrote on May 19th, 2009, 10:35pm:So, if some noise sources are correlated then total integarted noise in "timedomain" is larger than in "sources".
I can't understand what you mean.
"timedomain" give you
Ensemble_Averaged_Noise_Power_Density(time,freq),
while "sources" give you
Time_Averaged_Noise_Power_Density(freq).
But meaning or interpretation of frequency spectrum is different between these two.
See the followings.
http://www.designers-guide.org/Forum/YaBB.pl?num=1220976977http://www.designers-guide.org/Forum/YaBB.pl?num=1207830622http://www.designers-guide.org/Forum/YaBB.pl?num=1232220194/5#5k_p610 wrote on May 19th, 2009, 10:35pm:Does it mean that "timedomain" noise analysis is more accurate than "sources"?
Is "timedomain analysis always more accurate than "sources"?
I don't think so.