(a) Expressing vI1 and vI2 in terms of differential and common-mode components, find vO1

Chapter 2, Problem 2.74

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(a) Expressing vI1 and vI2 in terms of differential and common-mode components, find vO1 and vO2 in the circuit in Fig. 2.20(a) and hence find their differential component vO2 vO1 and their common-mode component 1 2 (vO1 + vO2). Now find the differential gain and the common-mode gain of the first stage of this instrumentation amplifier and hence the CMRR. (b) Repeat for the circuit in Fig. 2.20(b), and comment on the difference between the two circuits.

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