Hi All, I am trying to design a schimitt trigger in xshem for my power on reset circuit. But I am getting voltage spikes or noise (screenshot attached) when the output is low. Moreover, as I change the time step for the transient simulations, the values of these spikes change. Can anyone please tell me the reason of these fluctuations. I have attached the circuit as well. Thank you very much.

Use .option method=Gear. This must be just computation noise.

@Luis Henrique Rodovalho @Stefan Schippers It worked!!! Thank you so much for help and explanation🙂.