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PhysicsTruth

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- TL;DR Summary
- Working mechanisms of the LTSpice software regarding the frequency domain analysis of a circuit.

The time domain analysis is easier to plot compared to analyzing the frequency with respect to the phase. But, LTSpice makes it look really easy. So, for a small signal AC analysis, LTSpice does use a AC voltage source for its frequency domain analysis function. This must be a really convenient source of voltage. Is it the Sine waveform that the frequency function of LTSpice uses for its frequency analysis? Can we just use any other voltage source like a pulse or a FM wave, as are available in LTSpice for AC sweep? Do they actually work in every condition for the frequency analysis?

So, my basic area of interest is - does LTSpice have some specific AC voltage source, like a Sine Wave, or a random pulse (square, sawtooth), that it uses for its frequency analysis everytime we wish to obtain a Bode plot ? This would intrigue me further to read about the convenience of such a AC voltage source to be used for small signal AC analysis and its frequency plots.

So, my basic area of interest is - does LTSpice have some specific AC voltage source, like a Sine Wave, or a random pulse (square, sawtooth), that it uses for its frequency analysis everytime we wish to obtain a Bode plot ? This would intrigue me further to read about the convenience of such a AC voltage source to be used for small signal AC analysis and its frequency plots.