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Q#1 OP-AMP and its Applications GATE EC 2001 MSQ +2 marks -0 marks

Assume that the OP-AMP in Figure is ideal.

 

(a) Obtain an expression for  in terms of, R, and the reverse saturation current  of the transistor.

(b) If R = 1Ω,  and the thermal voltage, then what is the value of the output voltage  for an input voltage ?

(c) Suppose that the transistor in the feedback path is replaced by a p-n-junction diode with a reverse saturation current of  The p-side of the diode is connected to node A and the n-side to node B. Then what is the expression for  in terms of, R, ?

(a)

(b)

(c)

(b)

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