The feedback capacitance of an inverting amplifier is 10 pF. What is the Miller capacitance at the output if the gain of the amplifier is -120?
Question
The feedback capacitance of an inverting amplifier is 10 pF. What is the Miller capacitance at the output if the gain of the amplifier is -120?
Solution
The Miller effect is a phenomenon in electronic amplifiers where the input capacitance is increased due to amplification. The Miller capacitance (Cm) can be calculated using the formula:
Cm = Cf * (1 - A)
where: Cf is the feedback capacitance, A is the gain of the amplifier.
Given: Cf = 10 pF, A = -120.
Substitute these values into the formula:
Cm = 10 pF * (1 - (-120)) Cm = 10 pF * 121 Cm = 1210 pF
So, the Miller capacitance at the output is 1210 pF.
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