-Which of the amplifiers in Figure 18-1 would be used as a buffer amplifier?
A)Figure 18-1(a)
B)Figure 18-1(b)
C)Figure 18-1(c)
D)none of these

Question

-Which of the amplifiers in Figure 18-1 would be used as a buffer amplifier?
A)Figure 18-1(a) 
B)Figure 18-1(b) 
C)Figure 18-1(c) 
D)none of these

Quizplus · Accepted Answer

The buffer amplifier has a high input impedance and a low output impedance. The amplifier in Figure 18-1(a) has a high input impedance due to the large value of the feedback resistor, Rf. The output impedance is low due to the use of an emitter follower.

-Which of the Amplifiers in Figure 18-1 Would Be Used