I have an unexplored area in LTSpice, I have seen a significant different between the FFT responses (for the waveforms generated for the same circuit parameters) for different settings of "Stop Time" and "Minimum Time step" in the "Edit Simulation Command" window. I just briefly went through the table of contents of the book (thanks for the link) and see that there is a chapter10 and sections 10.11.1, 2, 3 describes this. But rest of the book is not that interesting to me as it looks more like a manual to me. Does anyone have any article explaining what should be the optimum settings to get a more real FFT picture? Also, is there not an e-book version released?