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In the feedback network shown below, if the feedback factor k is increased, then the
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- input impedance increases and output impedance decreases.
- input impedance increases and output impedance also increases.
- input impedance decreases and output impedance also decreases.
- input impedance decreases and output impedance increases.
Correct Option: A
Input Independence of a voltage-voltage feedback circuit = Zi (1 + A0 k)
Zi = initial input impedance (without feed output
Impedance of a voltage-voltage feedback circuit = Z0 / (1 + A0 k)
Z0 = initial output impedance (without feedback)
Hence, As K is increased, the input impedance will increase and output impedance will decrease.
