** How can I get the output power spectrum and PSD curve in ezwave for a OTA-C circuit?**

i am using Eldo by simulating the SPICE code of the circuit.

Suppose, I want to get the the above for a OTA-C linear filter.In that case, what should be code for this analysis?

If I do use the waveform calculator of ezwave, it's possible to have the PSD curve. but I am confused about the input , what should be the input of the filter, a sinusoidal? a DC? or AC? Also what should be the analysis in SPICE code?