Thermocouple temperature system simulation circuit

Published:2011/9/12 21:17:00 Author:John | Keyword: Thermocouple temperature system | From:SeekIC

Temperature on the cold junction is measured by the use of resistance temperature detectors (RTD) or thermistor (shown in the RT). The resistance for these two devices changes along with the temperature. On-chip current source provides the required excitation current. In this measurement configuration, a ratio is used, that is, the ADC reference voltage source and the precision resistor use the same excitation current. A ratio configuration enables the temperature measurement on the cold junction to be independent from the excitation current, because the change of excitation current can lead to same changing amount of the voltage generated by the sensor and that generated by the precision resistor. Therefore, there is no effect on analog digital conversion.



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