Rectangular pulse coming as trapezoid

I have implemented a mechanism where I am feeding a rectangular pulsetrain to a multiport switch which should give a switcing sequence of rectangular pulses. However, I am getting the profile of the pulses as trapezoidal.

Solver Selection:

Is this because of the 'Fixed-Step' Solver (ode4-runge-Kutta)?

function block input:

output of function block:

(The code is written so V takes either 1 or 3 values)

Not sure why it's coming trapezoidal.

Output of Multiport switch:

Should be rectangular pulse, but coming trapezoidal.

What can be done in this case?

Answer 1

[Fangjun Jiang]

This is normal. The ideal perfect rectangular pulse requires two values (1 and 3) at the exact same time (e.g. t=0.2895). The output can't achieve that. There will be a tiny time difference between two consuctive outputs, as small as the time step (10e-6). The output curve connects two output points. It will show as trapezoidal when zooming in enough.

[Siddhi Kadam]

Okay Thank you for your answer.