Figure $18

Question

Figure $18 < 1$
-If $\mathrm { R } _ { f } = 150 \mathrm { k } \Omega$ and $\mathrm { R } _ { \mathrm { i } } = 10 \mathrm { k } \Omega$  in Figure  18-1(c) , the voltage gain equals________
A) -0.066 
B) -16 
C) -15 
D) -1

Quizplus · Accepted Answer

Using the formula for inverting amplifier voltage gain, we have
$$V_{out} = -\frac{R_f}{R_i}V_{in}$$
Substituting the values given in the problem, we get
$$V_{out} = -\frac{150 \mathrm{k}\Omega}{10\mathrm{k} \Omega}V_{in} = -15V_{in}$$
Therefore, the voltage gain is -15. Answer choice C is the only one that matches this value.

Figure 18<118 < 118<1 -If Rf=150kΩ\mathrm { R } _ { f } = 150 \mathrm { k } \OmegaRf​=150kΩ

Figure $18 < 1$ -If $\mathrm { R } _ { f } = 150 \mathrm { k } \Omega$