-Refer to a)in the figure above. If R1 = R2 = 30 k▲ and the closed loop gain is 450, the value of the external gain- setting resistor RG is
A)133.63 ▲.
B)13.36 ▲.
C)133.63 k▲.
D)None of the above.

Question

-Refer to a)in the figure above. If R1 = R2 = 30 k▲ and the closed loop gain is 450, the value of the external gain- setting resistor RG is
A)133.63 ▲. 
B)13.36 ▲. 
C)133.63 k▲. 
D)None of the above.

Quizplus · Accepted Answer

The closed-loop gain is given by:```A_CL = -R2/R1 * (1 + RG/R1)```Substituting the given values, we get:```450 = -30k/30k * (1 + RG/30k)```Solving for RG, we get:```RG = 133.63k```

-Refer to A)in the Figure Above