Thank you for your reply.
Cgso has to be charged by the gate driver.
Cgdo suffers from the Miller effect, so appears as though it is larger than it is by a factor equal to the voltage gain of the stage.
As the voltage gain of a power MOSFET stage is not so easy to quantify, it is often easier to think in terms of gate Charge instead of gate Capacitance. Switching times are approximately equal to gate charge divided by gate current.
But, as @LowQCab says, let SPICE do the work!
I found that paramete in PSPICE MODELI have never seen the terms CGD and CGS with an "O" added to the end,
What does the "O" represent ?
"" So could I calculate CGS0= Ciss-Crss...... ""
CGS, CDG, and CDS are Specific-Measurements.
Ciss, Crss, and Coss, are "Derived-Values".
Study the picture provided, most of the important formulas are there.
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