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5.7 The op amp in Fig. 5.46 has Ri = 100 kΩ, Ro = 100 Ω, A = 100,000. Find the differential voltage vd and the output voltage vo.
Figure 5.46
For Prob. 5.7.
![Check Mark](/static/check-mark.png)
Calculate the differential voltage
Answer to Problem 7P
The differential voltage
Explanation of Solution
Given data:
Refer Figure 5.46 in the textbook for the op amp circuit.
The open-loop gain A is 100,000,
The input resistance
The output resistance
Calculation:
The equivalent circuit of the the given 741 op amp is drawn and it is shown in Figure 1.
Apply Kirchhoff's current law at node 1 in Figure 1.
Simplify the equation as follows.
From Figure 1, consider the expression for the voltage
Apply Kirchhoff's current law at node 2 in Figure 1.
Substitute 100,000 for A and
Substitute equation (1) in (2).
Simplify the equation as follows.
Substitute 1 mV for
From Figure 1, consider the expression for the output voltage
Substitute 100,000 for A.
Substitute
Conclusion:
Thus, the differential voltage
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Chapter 5 Solutions
EBK FUNDAMENTALS OF ELECTRIC CIRCUITS
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