Concept explainers
For the circuit of Fig. 6.62, calculate the differential input voltage and the input bias current if the op amp is a(n) (a) μA741; (b) LF411; (c) AD549K.
(a)
Find the differential input voltage and input bias current of op amp.
Answer to Problem 50E
The differential voltage
Explanation of Solution
Given Data:
Differential op amp is
Calculation:
The redrawn circuit of op amp is shown in Figure 1 as follows:
Refer to the redrawn Figure 1:
The expression for the nodal analysis at the nodal voltage
Here,
The expression for nodal analysis at nodal voltage
Here,
The expression for the bias input current of differential op amp is:
Here,
Simplify the equation (1) for
Refer to the TABLE 6.3 in the textbook.
Substitute
Rearrange for
Substitute
Substitute
Substitute
Rearrange for
Conclusion:
Thus, the differential voltage
(b)
Find the differential input voltage and input bias current of op amp.
Answer to Problem 50E
The differential voltage
Explanation of Solution
Given Data:
Differential op amp is
Calculation:
Refer to the TABLE 6.3 in the textbook.
Substitute
Rearrange for
Substitute
Substitute
Substitute
Rearrange for
Conclusion:
Thus, the differential voltage
(c)
Find the differential input voltage and input bias current of
Answer to Problem 50E
The differential voltage
Explanation of Solution
Given Data:
Differential op amp is
Calculation:
Refer to the TABLE 6.3 in the textbook.
Substitute
Rearrange for
Substitute
Substitute
Substitute
Rearrange for
Conclusion:
Thus, the differential voltage
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