The phenomenon where the parasitic capacitance between the input and output nodes of an inverting amplifying device (like the base-collector junction of a transistor) appears multiplied by the amplifier's voltage gain when viewed from the input. This artificially high input capacitance creates a low-pass filter with the source resistance, severely limiting the high-frequency response and switching speed of the circuit.
The switching losses in this MOSFET are too high because the Miller effect is stretching out the gate charge time during the turn-on phase.
Cascode amplifier topologies are specifically designed to defeat the Miller effect by keeping the voltage across the input transistor relatively constant, preventing the capacitance multiplication.
Related terms
Parasitic
An unintended electrical property like capacitance or inductance that exists physically in a circuit.
MOSFET
A metal-oxide-semiconductor field-effect transistor is a voltage-controlled switch used to amplify or switch electronic signals.
Gain
A measure of a circuit's ability to increase the power or amplitude of a signal.
Rise time
The time required for a signal to transition from a specified low state to a specified high state.