Figure 18-1
-If R_f = 1.2 M? and A_V = 120 in Figure 18-1(c) , R_i equals ________.

Name: Figure 18-1 -If R f = 1.2 M? and A V = 120 in Figure 18-1(c), R i equals ________. A) 100 k? B) 120 ? C) 1 k? D) 10 k?
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Question

Figure 18-1 -If R_f = 1.2 M? and A_V = 120 in Figure 18-1(c), R_i equals ________. A) 100 k? B) 120 ? C) 1 k? D) 10 k?

Quizplus · Accepted Answer

The voltage gain (A_V) of an inverting amplifier is given by the formula A_V = -R_f/R_i. Given A_V = 120 and R_f = 1.2 MΩ, solving for R_i gives R_i = R_f/A_V = 1.2 MΩ / 120 = 10 kΩ.

Figure 18-1 -If Rf = 1.2 M? and AV = 120 in 120

Figure 18-1 -If R_f = 1.2 M? and A_V = 120 in 120