What is the miller effect in simple terms?

Answer 1

A: That becomes evident while the driving source i limited in current driving abilities the voltage increases the phenomenon occurs known as the miller effect. Once the threshold voltage is passed it begins to draw increasingly heavier drain current with respect to the gate. As the drain rises the trans conductance rises rapidly to saturation. concurrent with the rise in gain the once low feedback capacitance now swells to enormous proportions appearing as an additional to the input capacitance.

cin=ciss+[1+av]cgd

ciss= gate source in cap

cgd=m gate drain capacitance

av= voltage gain

Answer 2

From what I understand the Miller Effect basically increases your input capacitance due to the properties of the Miller Theorem.

The miller theorem basically gives you an equivalent circuit (an alternative way to view the circuit).