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Electric circuits miscellaneous

  1. The parameters of the circuit shown in the figure given below are Ri = 1M Ω, Ro =10 Ω , A = 106 V/V. If Vi = 1 μ V, then output voltage, input impedance and output impedance respectively are

    1. 1V, ∞, 10 Ω
    2. 1 V, 0, 10 Ω
    3. 1 V, 0, ∞
    4. 10 V, ∞, 10 Ω
Correct Option: A

Output voltage= AVi = 106 × 10– 6 = 1 volt.
V1 = Z11 i1 + Z12 i2
V2 = Z21 i1 + Z22 i2

Output circuit secondary, i2 = 0

Z22 =
V2
=
AVi
= R0 = 10 Ω
i2i2



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