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I got a homework question as follows:

I was able to create triangle wave but I am having problem with the output wave. It is not exactly a square wave. What am I doing wrong ?

Simulate the Schmitt Trigger in the Figure 4 using SPICE. Sweep Vin form 0 to 3.2 and plot Vin versus Vout when VDD= 3.2V. Determine the threshold voltages Vth- and Vth+ from the plot. Use the following parameters:

NMOS : vt0=0.48 gamma=0.524 kp=1.02e-4 PMOS : vt0=-0.46 gamma=0.406 kp=5.16e-5

All the transistors have the same L = 60n and W1 = 1.8u, W2 = 720n, W3 = 180n W4 = 1.2u W5=1.8u W6=180n

Here is my circuit: enter image description here

Here is my output: enter image description here

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  • \$\begingroup\$ The 4th pin might have to be connected to either Vdd or Vss, depending on the case. \$\endgroup\$ – a concerned citizen Dec 8 '19 at 20:16
  • \$\begingroup\$ Thank you so much ! \$\endgroup\$ – uğurcan akdemir Dec 9 '19 at 7:43

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