Pspice: derivative function in probe

AI Thread Summary
The discussion revolves around obtaining the derivative of the voltage transfer characteristic (VTC) curve for MOSFET inverters in Pspice to calculate noise margins. The user is encountering issues with the probe function 'd()' to derive this curve, receiving an "invalid expressions" error when attempting to apply it to 'V(2)'. They have provided their circuit model and parameters for both NMOS and PMOS transistors. Despite referring to the user manual, the solution remains elusive. The user expresses gratitude for any assistance provided.
ram0001
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Hi Guys,
I am stuck at a point and needs help.
The thing is I am doing MOSFET inverters using Pspice.
I am getting its VTC (voltage characteristic Curve) But I don't know how to get derivative of this curve in order to obtain some parameters required for Noise margin.
Here is the file:

.model NMOD NMOS (LEVEL=1, VTO=0.6 GAMMA=0 LAMBDA=0 KP=60U)
.model PMOD PMOS (LEVEL=1, VTO=-0.8 GAMMA=0 LAMBDA=0 KP=20U)

***********
* CIRCUIT *
***********

VDD 3 0 DC 3
VGS 1 0 DC 3
M1 2 1 0 0 NMOD L=0.8U W=2U
M2 2 1 3 3 PMOD L=0.8U W=10U
.OP
.DC LIN VGS 0 3 0.1
.PLOT DC V(2)
.PROBE
.END

I have 9.1 Student ,Demo version. I referred to user manual... and it says I used use probe function 'd()' to get derivative but that's not working. It says invalid expressions.
I am taking 'd()' at 'V(2)'.
I would really appreciate if some one can help me out.
Thanks,
 
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I got it.
thanks
 

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