Miller capacitance

In bipolar transistors and field-effect transistors, the phenomenon in which the capacitance between the base and emitter or between the gate and source acts multiplied by the gain (amplification factor) of the capacitance between the base and collector or between the gate and drain is called the Miller effect, and the capacitance on the input side is called the Miller capacitance. If the capacitance between input and output is C and the gain is A, the Miller capacitance (input capacitance) is expressed by the following formula.

Miller capacitance = C(A+1)

In the Miller effect, a small capacitance between input and output is amplified and, as a large Miller capacitance (input capacitance), affects the frequency characteristics. The name was given after its discoverer and is not related to "mirror," which means a looking glass.