Hello aldapool. Try using an AC_VOLTAGE component, that you'll find in the Master database, Sources Group, SIGNAL_VOLTAGE _SOURCES family. After you place it, double click it and configure your sinusoidal signal. You'll find a damping factor which will diminish the signal as time runs.
To check if its working place a load resistor and run a transient analysis. Remember to fix the End Time and to analyze the voltage source. You should see a decaying sine signal.
I hope this information is useful for you.
Mensaje editado por Pedrobertoni