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Cadence virtuoso differential port

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Hi all,

I want to use single port for differential feeding in cadence virtuoso, i tried to connect it as in the picture
1606679431975.png

and i assumed that RF+ and RF- will be differential but when i did transient analysis they appeared in phase and not differential. So what am i getting wrong??
and why doesn't it work as ADS
 

dick_freebird

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There is no ground reference, so any results will
be questionable. For convenience I would replace
the "PORT0" voltage source with a pair in series of
half amplitude (and half series resistance, if the
symbol is to be believed), and a gnd! attached to
their center tap. Then you should have a differential
ground-referred source.
 
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Thank you but even if there is no gorund reference shouldn't the 2pins appear 180 out of phase ?
 

dick_freebird

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"Should" does not always lead to "did"....

There could be a small out-of-phase difference
riding on top of a gross offset or perturbation due
to there being no capacitance or conductance to
the "reference plane", to absorb minuscule
numerical residue / "noise". Zero divided by zero
= ??? (especially when zero is not exactly zero
and you don't know what).

But it's just my hypothesis at this point; try and
see?
 

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