For the instrumentation amplifier in Figure 9.26, the parameters are R4 = 90 kΩ, R3 = 30kΩ, and R2 = 50 kΩ. Resistance R1 is a series combination of a fixed 2 kΩ resistor and a 100 kΩ potentiometer, (a) Determine the range of the differential voltage gain, (b) Determine the maximum current in R1 for input voltages in the range −25 mV to +25 mV
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