Low voltage temperature sensor and use thereof for autonomous multiprobe measurement device
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United States of America Patent
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May 28, 2013
Grant Date -
Apr 4, 2013
app pub date -
Nov 21, 2012
filing date -
Mar 25, 2010
priority date (Note) -
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Abstract
A bandgap sensor which measures temperatures within an integrated circuit is presented. The sensor may include a first transistor having an emitter node coupled in series to a first resistor and a first current source, wherein a PTAT current flows through the first resistor, and a second transistor having a base node coupled to a base node of the first transistor, and a collector node coupled to a collector node of the first transistor, further wherein the first and second transistors are diode connected. The sensor may further include a first operational amplifier providing negative feedback to the first current source, wherein the negative feedback is related to a difference in the base-emitter voltages of the first and second transistors, and a second operational amplifier which couples the base-emitter voltage of the second transistor across a second resistor, wherein a CTAT current flows through the second resistor.
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