Translate 'Weird' in the calculation of the capacity of MOSFET

Hello world

I have a problem with the result of the simulation to calculate N - CH Mosfet capacitance (Cgs, CGD and CBD).

In this simulation, I tried to check my manual calculation with the result of Spice to 11.0 Multsim. But the result in Multism simulation is stopped different from the manual calculation or Pspice/Hspice simulation.

Manual calculation:

Multisim simulation:

Definition of parameters in Multisim:

. Multisim DC

> DC of PSPICE

It appears from these results that Pspice gave a value close to the theoretical calculation of the MOSFET here.  And I got the result in Multisim.

Can someone help me solve this problem?... Multisim is not as powerful as other spices software? or simply, I messed up with the Multisim formatting settings and ended up with the wrong answer?

According to me, you go always peripheral the capacitances output variables. These would be only the capabilities reported and identical to the DC - incorrect. We checked the code and capabilities used in the analysis are the right ones.

To illustrate so, using variables real circuit - voltage and current, I calculated the impedance looking in the door to a range of 1 GHz (its a little non-trivial to demonstrate the impedance of specific capabilities because you can't get out easily aware of the capacity). The results are similar to PSpice.

So to reiterate - the real circuit test results are not affected. For now, we ask that you do not watch the variable capacitance device because it is incorrect.

Hope that helps.

Tags: NI Software

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