Hello,
I am trying to plot the ISF for a squarish waveform generated by an oscillator. I am aware that the simulator plots PPV not ISF. However, the shape of PPV and ISF will be more or less the same (please correct me if I'm wrong). The red waveform is the transient waveform for an output node for my oscillator. The blue waveform is the PPV plot for the same node. It has been discussed in literature that for the flat part of a squarish waveform the ISF will be 0. I have highlighted the flat-ish part of the transient output but the PPV plot is not 0 (neither constant) for that region.
Why is it so?
Please note I have made 2 assumptions:
1. PPV and ISF look the same (they have different definitions)
2. The red waveform is treated as a squarish waveform by the simulator.