Re: Calaculation the capacitence of an mosfet c(VGS)
Hi,
to be true i can´t find the relation between schematic and graphs. I tried names and color, but didn´t find it... Also, what is current, and what is voltage.
To measure the current you need a signal where the voltage range is the regiion where the FET is well within the "open" state.
A very save method for capacitance measurement is to use a sine voltage signal and correlate the current with the voltage. For capacitance calculation only take the imaginary part of the current.
The real part of the currrent is caused by ohmic resistance (bad isolation, DC resistance, FET conductivity)
But mabe it´s not worth the effort.
Klaus