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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? [Diagram: voltage-voltage feedback block diagram with amplifier A0 and feedback block k, showing Vin, Vout, and feedback Vf = kVout]

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 system typically leads to higher input impedance because the feedback reduces the effect of the input signal on the output, while the output impedance decreases as the feedback stabilizes the output against variations.

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