Consider the difference amplifier in Figure 9.24(a). (a) Design the circuit with R2 = R4 , R1 = R3 , and such that the differential voltage gain is Ad = 50. For input voltages in the range of −50 mV to +50 mV, the maximum current in R2 is to be limited to 50 μ A. (b) Using the results of part (a), what is the maximum current in R3 ?
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