Question 8.7: A negative voltage feedback amplifier has been shown in Fig....
A negative voltage feedback amplifier has been shown in Fig. 8.15. Calculate the overall voltage gain if the gain of the amplifier without feedback is 10,000.
V_{f} = βV_{o}
=\left[\frac{R_{1}}{R_{1}+R_{2}} \right] V_{0}.
β=\frac{R_{1}} {R_{1}+R_{2}} =\frac{2× 10 ^{3}}{(2+20)10^{3}}=\frac{2}{22}= 0.09
A_{f} = \frac{A}{1+Aβ}=\frac{10,000}{1+ 10,000× 0.09}=\frac{10,000}{901}=11.09
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