I need to convert a PMW signal to an analog signal. To do this, i'll prob need an LC filter. My load resistance is 4ohms and cut off frequency is 20kHz. (1) Is there anyway to find the value of L and C?

(2) Is the value of L and C dependent on the input signal?

Because when i did simulation, they would always ask for the "AC amplitude" for doing small signal analysis. (3) What is this AC amplitude for a PWM signal?

Thanks!