Design a circuit that senses the temperatures T1 and T2 at two different sites, and yields VO = (0.1 V)(T2 − T1), T1 and T2 in degrees Celsius. The circuit uses two matched diodes with Is (25 ◦C) = 2 fA as temperature sensors, and two potentiometers for its calibration. Describe the calibration procedure.

Design a circuit that senses the temperatures T1 and T2 at two different sites, and yields VO = (0.1 V)(T2 − T1), T1 and T2 in degrees Celsius. The circuit uses two matched diodes with Is (25 ◦C) = 2 fA as temperature sensors, and two potentiometers for its calibration. Describe the calibration procedure.


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