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What is your regulator model setting?
Btw, you have to extrapolate down to DC.
Here are some suggestions:
- Using the Touchstone Viewer you can convert S-parameters into fitted-poles models (.pls) that extend the frequency range down to 1kHz (Convert -> To Fitted Poles). This will be helpful if you youse ADMS for your subsequent simulations. In addition you can add EXTRAP TO DC=1 into the Eldo/SPICE Model Parameters window to enable ELDO to extrapolate to DC.
- If you use HSpice adding the parameter INTERPOLATION = HYBRID will help properly extrapolate at low-frequencies.
Hope this helps,