Analog-Multiplier Circuit Linearizes Transducer Output

A circuit employing one operational amplifier and one analog multiplier is used to produce a voltage output proportional to the quantity t when the input voltage is related to t (e.g., temperature) by at + bt2, where a and b are constants. The determination of the resistor values, the useful operating voltage range, the accuracy of the linearizing process and the effects of changes in the ambient temperature are discussed. Extension of the circuit to higher order polynomial functions is also considered.