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In a voltage-voltage feedback as shown below, which one of the following statements is TRUE if the gain k is increased?

1. The input impedance increases and output impedance decreases.
2. The input impedance increases and output impedance also increases.
3. The input impedance decreases and output impedance also decreases.
4. The input impedance decreases and output impedance increases.

Correct answer: The input impedance increases and output impedance decreases.

Solution

Increasing the gain k in a voltage-voltage feedback configuration typically leads to higher input impedance because the feedback reduces the effect of the input signal on the circuit, while the output impedance decreases as the feedback stabilizes the output against variations.

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