Schmitt Trigger Simulation Issue: How to Add Hysteresis in CMOS Design?

[cadelyhde]

hi...
i'm new here. currently, I'm having a problem with pspice simulation. I'm design a schmitt trigger using cmos but when i run it, the forward and reverse switching voltage does not appear. how should i do to make the hysteresis appear in the output simulation waveform? please... i need it urgent..

 

[berkeman]

Are you still having this problem? Can you post your schematic or SPICE deck?