Not sure if this is possible to do using SP Simulation or not.

I’m trying to do a small signal simulation of a filter (I have the .s2p data 2-port filter) and I wanted to put a complex load on the output and be able to fix the magnitude but sweep the phase.

I would like to be able to look into the input to see what my worst case reflection is based on the phase sweep. I tried putting in a regular termination and using the Re+j*Im format, but it doesn’t seem to work (plus it won't allow a negative resistance).

This is sort of like a load-pull, but I did not want to run a harmonic balance. This will help me to determine a worst case loading effect caused by this filter that is presented to my DUT. The gamma I get from this will be what I use as a worst case load for an my actual bench level load-pull testing.

Edited by: jktong on Oct 17, 2013 3:46 PM

I’m trying to do a small signal simulation of a filter (I have the .s2p data 2-port filter) and I wanted to put a complex load on the output and be able to fix the magnitude but sweep the phase.

I would like to be able to look into the input to see what my worst case reflection is based on the phase sweep. I tried putting in a regular termination and using the Re+j*Im format, but it doesn’t seem to work (plus it won't allow a negative resistance).

This is sort of like a load-pull, but I did not want to run a harmonic balance. This will help me to determine a worst case loading effect caused by this filter that is presented to my DUT. The gamma I get from this will be what I use as a worst case load for an my actual bench level load-pull testing.

Edited by: jktong on Oct 17, 2013 3:46 PM

Another possibility is DesignGuide > Load Pull > Mismatch Analysis > Constant Available Source Power. In this one, the VSWR and the phase of the load are swept and plots of performance variation are shown.

If you don't see the above two selections in your version of ADS, you may need to download the latest version of the Load Pull DesignGuide from the Agilent EEsof Knowledge Center: http://edocs.soco.agilent.com/display/eesofkcads/Load%20Pull%20DesignGuide%20Enhancements%20for%20post%20ADS%202011_10

These setups could be simplified to run with S-Parameter analysis instead of harmonic balance, but the data displays would have to be modified.