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**1. Homework Statement**

(a) Derive the relationship

between the output voltage V and the input current I; i.e. if V = kI

find k in terms of R1, R2 and Rf.

(b) Calculate the current I if Rf = 10 MΩ, R1 = 90 kΩ, R2 = 10 kΩ

and V –0.1 V.

(c) Model the circuit using PSPICE [using an ideal opamp]

and use the model to confirm the calculation made in (b).

**2. Homework Equations**

**3. The Attempt at a Solution**

(a) V= KI, K= R2/ R2+ (Rf*R1/Rf+R1)

(b) I= V/K , I= -0.1/(10k/10k+(90k*10M/90k+10M), I= -0.992A (too big a current?)

(c)

Im not sure how to complete this schematic, I need to check current calculation in (b). I dont kow what "Vin" is. Any help is greatly appreciated as I have no training on this software.