Hi,What sort of spectral density is obtained when we do Pnoise analysis in Spectre-RF.Is it power spectral density of phase or is it power spectral density of voltage?Best RegardsSarfraz
In reply to Andrew Beckett:
In reply to sarfraz:
In Spectre 6.1, in the Pnoise simmulator, modulated noise type. Do you know if the PM noise is SSB or DSB. I'm trying to figure out if my results are 3db greater than they should be. I'm only interested in SSB
In reply to Angel Rael:
If you look at the PM output it's DSB (because it is using both sidebands to compute the AM and PM components), if you look at either the USB or LSB output it's SSB. At least that's what I think it should be - checking such an old version is hard (and makes little sense for me to check).
Note that spectre 6.1 is pretty old - I would strongly advise against using a version of the simulator that is probably 7 years or so old - I can't quite remember the date ranges for MMSIM61. SSince then we've had 6.2, 7.0, 7.1, 7.2, 10.1, 11.1 and 12.1 (so 7 major new versions of the simulator).
L(f) is defined as a single sideband entity and in the phase noise results I have obtained in IC 6.1 the pnoise output reflects this definition. I hope I understood your question correctly!
The definition of modulated AM and PM noise in Cadence was changed some time ago, see http://www.designers-guide.org/Forum/YaBB.pl?num=1309258199/27#27 .