A high-precision temperature measurement circuit design
Cuimei Liu · Electronic Instrumentation Customers · 2008
It is introduced in this paper the high-precision temperature sensing circuitry taking platinum resistance as temperature measurement device.The hardware circuit and its working principle have been analyzed in this paper.The same reference voltage is used in the platinum resistance current source and A/D converter circuit power supply,It can makes that the measurement results is relevant only to the platinum resistance value with the change in temperature but it is irrelevant to the stability of the platinum resistance drive current,A/D converter reference voltage accuracy,etc.So it can reduce the stringent requirements of the hardware circuit in high-precision measurement and improve the accuracy of the temperature measurement.