Identify the feedback topology and draw the circuit without feedback, but taking the loading effect of the feedback network into account.

Consider the circuit in Fig. 1:
1. Identify the feedback topology and draw the circuit without feedback, but taking the loading effect of the feedback network into account.
2. Calculate the trans resistance gain (Vo/i1) without feedback but taking the loading effect of the feedback network into account. Calculate the trans resistance gain with feedback (Assume that R3>> R1//R2//rπ). Calculate also the trans resistance gain without feedback. Comment on the results.
3. Calculate the current gain (i0/i1) with feedback.
4. Calculate the input resistance (v1/i1) without and with feedback.
5. Calculate the voltage gain (Vo/v1) with feedback. 

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