Because of nonlinearity of platinum resistor

it can brings error to measurement. Folded line feedback circuit is adopted

and in four-wire platinum resistor is accessed to test circuit. Temperature sensor using this design can greatly improve measurement precision. By experimental test

at range of 0

100 ℃

the nonlinear error is in 0. 04 %

the max output voltage error is within 0. 002 V. It has characteristics of high reliability

high precision

low cost

so it is very suitable for industrial condition which has requirement of rigorous temperature measurement.