Concept explainers
(a) Determine the ratio vo/is in the op amp circuit of Fig. 5.54.
(b) Evaluate the ratio for R1 = 20 kΩ, R2 = 25 kΩ, R3 = 40 kΩ.
Figure 5.54
For Prob. 5.15.
(a)
Calculate the ratio
Answer to Problem 15P
The ratio
Explanation of Solution
Given data:
Refer Figure 5.54 in the textbook for the op amp circuit.
Calculation:
Modify the Figure 5.54 by indicating the node voltage
Apply Kirchhoff's current law to the node
Consider the expression for the current
Substitute equation (2) in (1).
Simplify the equation as follows.
Conclusion:
Thus, the ratio
(b)
Find the value for the ratio
Answer to Problem 15P
The value for
Explanation of Solution
Given data:
Consider that the resistors
Calculation:
Substitute
Conclusion:
Thus, the value for
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Chapter 5 Solutions
Fundamentals of Electric Circuits
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