Consider the op-amp difference amplifier in Figure 9.24(a). Let R1 = R3 and R2 = R4 . A load resistor RL = 10 kΩ is connected from the output terminal to ground, (a) Design the circuit such that the difference voltage gain is Ad = 15 and the minimum difference input resistance is 30kΩ. (b) If the load current is iL = 0.25 mA, what is the differential input voltage (υI ‒υI 1)? (c) If υI 1 =1.5 V and υI 2 = 1.2V, determine iL . (d) If iL = 0.5 mA when υI 2 = 2.0 V, determine υI 1 .
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