TRANSISTOR_SENSOR_1

Published:2009/7/10 21:17:00 Author:May | From:SeekIC

Current-ratio differential-pair temperature sensor uses dual transistor Q1. Difference between base-emitter voltages of Q1A and Q1B varies linearly with temperature, when dual transistor Q2 provides 10μA through Q1A and 5μA through Q1B. Instru-mentation opamp provides single-ended output with better than 1℃ accuracy over 300℃ temperature range. Analog Devices AD 590 IC version of differential pairwill operate overwire line thousands of feet away from instrumentation opamp, for remote sensing.-J, Williams, Designer's Guide to: Temperature Sensing, EDN Magazine, May 5, 1977, p 77-84.



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