2.73 Consider the instrumentation amplifier of Fig. 2.20(b) with a common-mode input voltage of +1 V (dc) and a differential input signal of 100-mV peak-to-peak sine wave. Let 2R1 = 2 kΩ, R2 = 50 kΩ, R3 = R4 = 10 kΩ. Find the voltage at every node in the circuit.
; −60 mV; increase 100Ω