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[Hspice]How to plot derivative or integral value of a curve

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pugongying

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hspice derivative

I want to simulate the value of gm of a transistor,which is gm=ΔId/ΔVgs,I know how to plot the I-V curve,but how to derivate it?

Also,I want to simulate the kT/C noise of a RC filter,I know how to plot the noise density,but to how integrate it ?

Thanks!
 

hspice plot

You can derivate it in awaves. Just build a expression in awaves and plot it.
 

how to plot an integral

Thanks ,but I am using cosmos scope
I can't find the integral or derivative funtions
can anybody help me ?
 

hspice integral

I also want to know!
 

plot derivative hspice

pugongying said:
Thanks ,but I am using cosmos scope
I can't find the integral or derivative funtions
can anybody help me ?
Click to expand...
Firstly, plot the signal Id, or i(m1)
Secondly, from the graph window, select the plotted signal -- Id, and Press Ctrl-X to cut or Ctrl-C to copy it.
Thirdly, open the calculator with menu "Tools / Waveform Calculator".
Lastly, in the calculator, choose menu "Edit / Paste". Then Click button "deriv" to derivative or "integ" to integrate it. And click toolbox icon "Graph X" to plot the derived signal.

Hope this will solve your problem.
 
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    pugongying

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    gladysh

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derivative hspice

Hughes,Thanks very much!
 

hspice deriv

Another method to get gm of the MOS transistor:

use .probe LX7(M*) or .probe GMO(M*)

You do not need to derviate anything.
 

how to plotderivative

you can use another tricky way, first generate a delayed VGS(probably by a few ns) and apply this delayed Vgs to another instance of the same cmos device, and then get the corresponding Ids1, then simply use a current controlled voltage source and set approporate coefficient to translate the Ids-Ids1 to certain voltage, the output of this voltage source may reflect the derivation of Ids/Vgs
 

cscope calculator integrate

Thanks a million. That was also what I was searching. I want to add a few keywords such as cscope and calculator.
 

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