*11.29 In the series–shunt feedback amplifier shown in Fig. P11.29, the devices operate with VBE …
#Electronics #amplifier #BJT
*11.29 In the series–shunt feedback amplifier shown in
Fig. P11.29, the devices operate with VBE
= 0.7 V and have
β1
= β2
= 100. The input signal Vs has a zero dc component.
Resistances Rs
= 100 , R1
= 1 k, R2
= 10 k, and
RL
= 1 k.
(a) If the loop gain is large, what do you expect the
closed-loop gain to be? Give both 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 Aβ. (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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