[SOLVED] lowpass filter output

[GBHT]

if i give a square wave input to a lowpass filter(1st order) whose corner frequency is much higher than the input frequency, at the output do i get a square wave or triangular wave(since 1st order lowpass is an integrator)?
if cutoff frequency is 10kHz and if i give an input of 50Hz then i thought i will get a square wave at the output since most of its harmonics pass through it..but i am getting triangular wave..is it correct? if yes then how?:arrow: thanks in advance

 

[f_mohsen]

you should get triangle because you are integrating, square wave is made up of sine waves and triangle is made of cos wave, there fore integrating square will turn all its fundamentals to cos wave, which in turns produce a triangle signal over all.

 

[LvW]

you should get triangle because you are integrating, square wave is made up of sine waves and triangle is made of cos wave, there fore integrating square will turn all its fundamentals to cos wave, which in turns produce a triangle signal over all.

No, it's not correct.

Of course, if the cut-off frequency is 10kHz and the basic frequency of the squarewave is only 50 Hz you will get at the output again a squarewave-like signal of 50 Hz.
If you see a triangle something went wrong with your simulation. Check it again! In particular, improve the time resolution (more steps).