question about LTspice .fra new feature

Hi jifei,

For the Stimulus Frequency section, the logic is to simply maximize the data point I can get but balance it such that the simulation time is not too long.

For the General section, what’s important for me there is to know when the converter is at steady state already. Then I place the value in the Start Analysis at Time[sec].

For the Stimulus Amplitude section, I play on the stimulus amplitude such that it is large enough to be measured as it enters and exits the system. But also small enough such that it will not cause too much perturbation in the system causing it to go out of bounce.

This is by monitoring the Vout waveform.

Hi kevin, thanks for your answer. I know how to select the amplitude of Stimulus. but still a little bit confuse how to select the suitable frequency F0 and F1.

F0(Hz) is the frequency at which the signal starts to reduce from its initial value. Typically, this is 1-10% of the anticipated crossover frequency.

F1(Hz) is the frequency at which the signal reaches its final value. This is usually just before the anticipated crossover frequency.