Please consider a feedback amplifier system as seen Figure1. Let Gm =

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Please consider a feedback amplifier system as seen Figure1. Let Gm = 10 mA/V, amplifier's input resistance ril = 100 kΩ, output resistance rol = 50 kΩ. Mosfet, Q, is biased to obtain gmQ = 1 mA/V and roQ = 50 kΩ. (70 points ) Figure 1 a) What is the topology? b) Please draw the AC equivalent circuit without feedback at midband frequencies, taking the loading of the feedback circuit into account. Clearly show the feedback signal on the circuit. c) Please calculate Ai = i0 /vs (without feedback) d) Please calculate β. e) Please calculate Af = io/vs. (with feedback) f) Please calculate fLf, the lower 3 dB frequency with feedback, if fL = 10 kHz.

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Please consider a feedback amplifier system as seen Figure1. Let $G_{m} = 10 m A / V$ , amplifier's input resistance $r_{i l} = 100 k Ω$ , output resistance $r_{o l} = 50 k Ω$ . Mosfet,Q, is biased to obtain $g_{m Q} = 1 m A / V$ and $r_{o Q} = 50 k Ω$ . $(70$ points $)$ Figure 1 a) What is the topology? b) Please draw the AC equivalent circuit without feedback at midband frequencies, taking the loading of the feedback circuit into account. Clearly show the feedback signal on the circuit. c) Please calculate $A_{i} = i_{0} / v_{s}$ (without feedback) d) Please calculate $β$ . e) Please calculate $A_{f} = i_{o} / v_{s}$ . (with feedback) f) Please calculate $f_{L f}$ , the lower $3 d B$ frequency with feedback, if $f_{L} = 10 k H z$ .