Concept explainers
The circuit in Fig. 5.80 is a differential amplifier driven by a bridge. Find vo.
Calculate the output voltage
Answer to Problem 48P
The output voltage
Explanation of Solution
Given data:
Refer Figure 5.80 in the textbook for the differential amplifier that is driven by a bridge circuit.
Calculation:
Consider break this problem up into parts. The 15.5 mV voltage source splits the lower circuit from the upper circuit. In addition, there is no current flowing into the op amp input which means we now have the
Consider the expression for the current flows through the circuit.
Substitute 15.5 mV for
The voltage across the
Substitute
The voltage across the
This voltage is also the voltage at both inputs of the op amp and the voltage between the
Modify Figure 5.80 by indicating the node voltages. The modified figure as shown in Figure 1.
Write a node equation at node
Consider the expression for the current through the
Substitute 10.091 mV for
Write the expression for the output voltage
Substitute
Conclusion:
Thus, the output voltage
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