4–85 A small pressure transducer has the characteristics shown in Figure P4–85. Design an interface that will operate between 10 and 30 psi. An input of 10 psi should produce 0 V and 30 psi should produce + 5 V. The transducer is modeled as a voltage source in series with a 500-Ω resistor that can vary

75 Ω depending on the pressure. The OP AMPs you must use have a maximum closed-loop gain of 2000. Your only available bias source is the 15VCC supply.

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V (V) 1200- 1000- 800 600- 400- 200- 0- 13 16 22 25 31' Pressure (psi) FIGURE P4-85