For any inverting amplifier, the input capacitance due to Miller effect

This question was previously asked in
UKPSC JE Electrical 2013 Official Paper I (Held on 7 Nov 2015)
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  1. increases
  2. decreases
  3. remains constant
  4. None of these

Answer (Detailed Solution Below)

Option 1 : increases
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UKPSC JE CE Full Test 1 (Paper I)
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Detailed Solution

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The correct answer is 'option 1'

Concept:

The Miller effect refers to the increase in equivalent capacitance that occurs when a capacitor is connected from the input to the output of an amplifier with a large negative gain. 

The virtually increased input capacitance due to the miller effect is given by the expression

where,  is the voltage gain() of the inverting amplifier and C is the feedback capacitance.

 is negative for inverting amplifier, the capacitance expression becomes

Thus, the input capacitance increases.

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