A revision is presented of the technique to determine the junction temperature and thermal resistance of bipolar transistors. It is based on the temperature sensitivity of the base-emitter voltage when biasing the device under constant emitter current. It accounts correctly for the self-heating of the device during the measurement. Results are obtained for devices fabricated on silicon-on-insulator (SOI) and bulk silicon having different emitter widths and lengths. An increment of the thermal resistance is found for SOI devices with respect to bulk.
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Vanhoucke et al. (2004) studied this question.
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