sgperzoid
Member level 3
the equivalent circuit of a miller item lets say a gate-to-drain capacitance of a MOSFET is well know.
The effect of Cgs can be replaced by a gate to ground capacitance and a drain to ground capacitance with the equation given.
However, intuitively, I think this is only an approximation of the Miller effect, the two miller equivalent capacitor do not readily act as the behaviour of Cgd throughout the frequency range, expecially at high frequency.
That is my intuitive observation, but I can not clearly and describe under what kind of situation, the Miller equivalent model is not a good approximation of the Miller capacitor.
Can anyone here help me? Hope you can provide a clear and complete answer
thank you in advance!
The effect of Cgs can be replaced by a gate to ground capacitance and a drain to ground capacitance with the equation given.
However, intuitively, I think this is only an approximation of the Miller effect, the two miller equivalent capacitor do not readily act as the behaviour of Cgd throughout the frequency range, expecially at high frequency.
That is my intuitive observation, but I can not clearly and describe under what kind of situation, the Miller equivalent model is not a good approximation of the Miller capacitor.
Can anyone here help me? Hope you can provide a clear and complete answer
thank you in advance!