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solution

In the series-shunt feedback amplifier shown in the diagram, the device operates with vbe=0.7V and have B1=B2=100. The input signal vs Has a zero DC component. resistances Rs=100 ohm,R1=1kohm,R2=10kohm and RL=1kohm.
(a)If the loop gain is very large, what do you expect the closed loop gain to be? give an expression and its value.
(b) find the DC emitter current in each of Q1 and Q2. also find the DC voltage at the emitter of Q2.
(c) calculate the value of the loop gain AB.(hint set vs =0 and break the loop at the base of Q1. simplify the circuit by eliminating DC sources.
(d) calculate the value of AF.

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