4–89 Your engineering firm needs an instrumentation amplifier that provides the following input-output relationship:

vO =106vTR −3:5 V. The transducer is modeled as a voltage source in series with a resistor that varies with the transducer voltage from 40 Ω to 750 Ω. Avendor is offering the amplifier shown in Figure P4–89, and the vendor agrees to make a single change to the amplifier, if needed, for no cost. Would you recommend buying it? Explain your rationale.

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+ VTR 1 www 1kQ www 1 w 1.42 www. + Vo + 5 V Cost $75 each Instrumentation Amplifier Model 54 FIGURE P4-89