4–75 A requirement exists for an OP AMP circuit with the input–output relationship vO =5vS1 −2vS2 Three proposed designs are shown in Figure P4–75. As the project engineer, you must recommend one of these circuits for production. Which of these circuits would you recommend for production and why? Do not assume they all work.

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VSI +o 45+ +o VS2 3 w 2 w Vo ww ww 1 2 Circuit 1 5 1 kQ 1 w ww +o W VSI +o W w 52 2 1 Circuit 2 + 1 W 5 w VS2 + + W VS1 2 www 1 Vo Circuit 3 FIGURE P4-75 w vo