Linearized Platinum Resistance Thermometer with ±0.025°C Accuracy Over 0 to 100°C

Platinum RTD's are typically driven with a constant current so that their resistance value directly translates to a temperature dependant voltage. Here the LT1001 and the LM129 create a constant current through the input 10K resistor which all flows through the sense resistor. A second amplifier inverts the signal to provide a positive output voltage of 1V per 10C temp change.