They either serve the sole purpose of carrying out network transmissions or are strictly necessary to provide an online service explicitly requested by you. The cookies we use can be categorized as follows: Strictly Necessary Cookies: These are cookies that are required for the operation of or specific functionality offered. The schematic for this case and its resulting waveform are shown below. step directive (press S to insert a spice directive in the schematic editor): For example, you could sweep a capacitance logarithmically through the range of 10pF to. This can be accomplished by stepping the parameter of interest using a. Repeated AC Analysis with Parameter SweepsĪC analysis usually involves using fixed parameters to calculate the small signal AC response of a circuit, but you may want to refine your design by viewing the response under varying parameters. For example, if you want to see how your circuit performs from 100Hz to 1MHz with 1,000 points per decade you would edit your simulation command to the following:

The small signal analysis results are plotted in the waveform viewer as magnitude and phase over frequency.ĪC analysis in LTspice has a number of settings: the X-axis scaling (linear, octave or decade), number of simulation points and frequency range. In LTspice, AC analysis involves computing the AC complex node voltages as a function of frequency using an independent voltage or current source as the driving signal.

LTspice: AC Analysis Using The Step Command

Ltspice ac source parameter description