Ken Kundert
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You have to remember that if the frequency in PAC differs at all from the frequency in PSS, then the phase relationship between PSS and PAC becomes meaningless, because the signals are at unrelated frequencies. In this case you get the average behavior. PAC takes that a bit farther. Even if the frequencies are related, it treats them as if they are not. Thus, pacphase is only needed if you have two PAC sources. It allows you to specify the phase difference between the two sources. So it is good for specifying differential signals if you do not use baluns.
-Ken
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