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you cna .fft syntax in HSPICE manual
fft is based on DFT, so you need to take care about
transient step for consistence to resolution.
Generally speaking, Fres (frequency resolution) is smaller with long simulation time due to larger window size. The analyzed frequency range is up to NP* fres (...
About the method by ramp up supply, it is not exactly confirmed if the circuit can work. It is because the node is unknow when power ramp up. The method to ensure if it works is to keep supply constant(VDD) as well as set initial conition at critical point to have zero initial current.
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