ACWWong
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the reference node should be Vout-, as you will use the VCO signal as a differential signal.
with regards to the phase, you can see the how "differential" the differential ouptus are from the pss run. using the main form you can plot the phase of Vout+, and the phase of Vout- against harmonics of the VCO frequency. You can use the "add to outputs" button to get thexact calculator expression, and value it at the VCO frequency.
an example for a 1MHz frequency is:
value(phaseDegUnwrapped(v("/Voutp" ?result "pss_fd")),1M)-value(phaseDegUnwrapped(v("/Voutn" ?result "pss_fd")),1M)
hope this helps
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