Andrew Beckett
Senior Fellow
![* *](https://designers-guide.org/forum/Templates/Forum/default/starsilver.gif) ![* *](https://designers-guide.org/forum/Templates/Forum/default/starsilver.gif) ![* *](https://designers-guide.org/forum/Templates/Forum/default/starsilver.gif) ![* *](https://designers-guide.org/forum/Templates/Forum/default/starsilver.gif) ![* *](https://designers-guide.org/forum/Templates/Forum/default/starsilver.gif)
Offline
![](https://designers-guide.org/forum/avatars/elmerfudd.gif)
Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
|
In that case, set the the PAC magnitude on the supply source, and do a PAC analysis as well. Then you can look at the signal level at the output caused by this small signal input.
The methods used in SpectreRF cannot currently handle mixed driven/autonomous circuits (with large signal inputs, that is). In PSS you need to simulate a complete beat period, which would be impractical, as I've outlined. With QPSS potentially it might be possible, but currently QPSS can't handle autonomous circuits (it's not that easy). There are other methods that could be explored, but nothing is available in SpectreRF right now for this situation, AFAIK.
However, in your case doing either PXF or PAC as I've outlined above is probably sufficient - and that will work fine, since all you have is the oscillator as a large signal variation to contend with.
Regards,
Andrew.
|