Miller effect

Have you ever played with a slinky? When you stretch the slinky, it becomes longer and thinner, right? And when you relax it, it becomes shorter and thicker. That's exactly what Miller Effect is but in electronics.

Miller Effect is something that happens in electronic circuits when a capacitor is connected to two parts of the circuit. The capacitor in this circuit acts like a slinky. When a signal passes through the circuit, the capacitor stores some of it, and then releases it at a later time.

In simple words, Miller Effect occurs when a capacitor between the input and output of an amplifier boosts the effective capacitance of the input. Essentially, the capacitor in the circuit acts like a bigger capacitor than its actual size. And this creates a problem as it causes the amplifier to amplify not only the intended signal but also signals caused by the feedback capacitance.

The bad news is that these additional signals can ruin the amplifier’s performance by reducing the frequency response and phase shift, which makes the amplifier slow and inefficient.

So Miller Effect is like a problem that can occur in electronic circuits when a capacitor between the input and output of an amplifier causes the amplifier to amplify not only the intended signal but also signals caused by the feedback capacitance. This can make the amplifier slow and inefficient.