Getting Started with LTspice
Simulation: AC Analysis
Ac analysis provides the frequency response of your circuit. The output waveform will be a bode plot showing you the amplitude and phase across a specified frequency range. There are several options with AC analysis. You can view frequency response as a bode plot, on the Cartesian coordinate plane with the real and imaginary axis and you can view it as a Nyquist plot.
We are going to build a passive, first order, low-pass filter and see what information can be obtained about the circuit from the plot.