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Thermocouple, Cold-Junction Compensation—Analog Approach

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Temperature is the most commonly measured physical parameter in a variety of systems, including automotive, industrial, and consumer domains. There are various temperature transducers available to address the need of accurate temperature measurement. Thermocouples are widely popular because they are inexpensive, have a wide range, are small in size, and do not need excitation. This application note discusses the thermocouple temperature-sensing requirements, particularly cold junction compensation and how to achieve the same compensation using analog components.