Hi everyone,
I used to calculate the LCL filter transfer theoritically and use LTspice to simulate in time and frequency domain.
when I simulate in the time domaine, I get a distorted sinewaveat te output!!
I am confused as why? because I have only passive component and the bode plot seems correct!!
this non linearity happens at high frequency only!!

 

Run the sim longer and post the results.

 

Hi Tarik,
Basically the circuit is initially ringing, give it time to settle.
Or add some source resistance in v1

E

 

you are correct, it worked properly. I had just to be patient a bit

 

Calculation of the simplest L-C-L scheme in Multisim and Qspice. The calculation took up to 40 ms. It was a long time in Multisim. Please note how long it took in Qspice. There is some inductance damping in Qspice - a parallel resistor of approximately 3 MegOhm is connected. This makes the simulation result more realistic. The result obtained in Multisim cannot be in reality.

 

Calculation of the simplest L-C-L scheme in Multisim and Qspice. The calculation took up to 40 ms. It was a long time in Multisim. Please note how long it took in Qspice. There is some inductance damping in Qspice - a parallel resistor of approximately 3 MegView attachment 340118Ohm is connected. This makes the simulation result more realistic. The result obtained in Multisim cannot be in reality.

Thanks, I got you. it was just a matter of span time