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Analog electronics circuits miscellaneous

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Analog Electronic Circuits

Analog electronics circuits miscellaneous
  1. In the circuit shown, Ri is given by:


    1. R2
    2. R1 + R2
    3. R1 + R2
    4. R1 + (K + 1) R2
Correct Option: D

From figure
V1 = I1 R1 + (I1 + k I1) R2
or V1 = I1 R1 + I1 R2 + I1 k R2
or V1 = I1 (R1 + R2 + k R2)

or
V1
= R1 + R2 (1 + K)
I1

or Ri =
V1
= R1 + R2 (1 + k)
I1


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