TRANSISTOR_SENSOR_TEMPERATURE_MEASURER

Published:2009/7/11 0:34:00 Author:May | From:SeekIC

Using the fact that the I/BE of a transistor shifts 59.16 mV per decade of current at 25℃. This constant is 0.33%/'℃. This VBE-vs.-current relationship holds true regardless of the VBE absolute value. IC, an LT1043, acts as an oscillator and switches a current source (Q1) at a 10:1 ratio. The stepped 10:1 current drive is translated to temperature by IC2, Q2, and the associated components. Accuracy is 11%. No compensation is needed if Q2 is changed.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Sensor_Circuit/TRANSISTOR_SENSOR_TEMPERATURE_MEASURER.html

Print this Page | Comments | Reading(3)