Hi RFICDUDE,

Do you mind giving me a ball park number for the situation you are describing?  
In the case where PSP yeilds better correlation, is the sim still better the lab?  By how much > or < than 3 or 5dB?
In the case where measurements are better than the lab, is the differernce around 5dB or more?  Are you surprise by the fact that lab is better than the sim or  the differernce ?
Also, when you said the bsim doesn't correlate well, did you just judge that by looking at the discrepancy between sim and lab (I assume the sim is a lot better than the lab)?  was the discrepancy mucher larger than 5 or 10dB?

If any of this is sensitive information, just let me know.  I just try to get a sense on what kind of the correlation I can expect for a up convert passive mixer design.

(I also have a down convrt passive mixer, the discrepancy was not that bad even though bsim was used.  But I think that's probabily because mixer was not the dominant source in that line up since I couldn't measure mixer by itself).

Thanks very much for your help.
Kelly

Hi RFICDUDE,

yes, understood, thanks very much.
Kelly