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The miller effect is the main bandwidth limiting factor in common emitter amplifiers, because the transistor feedback capacitance (also known as miller capacitance) is multiplied by the voltage gain.
Neutralization is one technique used to negate the miller effect, using positive feedback to neutralize the effect.
Is this video, Gregory explain why miller effect happens and the effect on a test amplifier bandwidth. The neutralization technique is shown, tested and the increase in bandwidth is demonstrated.
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You can read more about the effect in my article
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