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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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