PN-junction temperature sensing apparatus
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United States of America Patent
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Jul 20, 2010
Grant Date -
Jul 12, 2007
app pub date -
Dec 4, 2006
filing date -
Jun 4, 2004
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Abstract
A PN-junction temperature sensing apparatus for applying input signals to a semiconductor device and measuring temperature-dependent output signals has an odd number of current sources (1, 2, n) switches (5, 6, 7) with selectable outputs to connect the current sources (5, 6, 7) with a thermal sensor (12) or a sink diode (13) and an A/D converter (17) to digitize the measured voltage of the thermal sensor (12). A digital processor (18) controls the switches (5, 6, 7) and stores the digitized voltage values in a memory. Provided algorithms allow the usage of these values to provide a calibrated measurement of temperature and also sensor life estimation.
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