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D *2.71 The circuit shown in Fig. P2.71 is a representation of a versatile, commercially available IC, the INA105, manufactured by Burr-Brown and known as a differential amplifier module. It consists of an op amp and precision, laser-trimmed, metal-filmresistors. The circuit can be configuredfor a variety of applications by the appropriate connection of terminals A, B, C, D, and O. (a) Show how the circuit can be used to implement a difference amplifier of unity gain. (b) Show how the circuit can be used to implement single-ended amplifiers with gains: (i) −1 V/V (ii) +1 V/V (iii) +2 V/V (iv) +1/2 V/V Avoid leaving a terminal open-circuited, for such a terminal may act as an “antenna,” picking up interference and noise through capacitive coupling. Rather, find a convenient node to connect such a terminal in a redundant way. When more than one circuit implementation is possible, comment on the relative merits of each, taking into account such considerations as dependence on component matching and input resistance.