Device for sensing temperature of an electronic chip

An apparatus for measuring the temperature on an electronic chip comprising:

• a plurality of thermally sensitive elements each having an initial resistance on the electronic chip;
• a power supply successively in turn, placing in a cycle, a forced voltage on each of said thermally sensitive elements at a known voltage and initial temperature;
• a measuring circuit determining in its successive turn the initial resistance of one of the thermally sensitive elements at said known voltage and initial temperature;
• said measuring circuit measuring the change of the initial resistance of the thermally sensitive element during its successive turn as the temperature of the electronic chip changes;
• said measuring circuit comparing the change in the initial resistance of the thermally sensitive element from the initial resistance during the thermally sensitive element's successive turn;
• and
• said measuring circuit determining the temperature of the electronic chip from the initial resistances and change in resistances of the plurality of thermally sensitive elements during the operation of the electronic chip;
• wherein each thermally sensitive element is a spiral on metal on a metallization layer of the chip, said spiral of metal having a metal length of 20 mm and a width of 2.7 micrometers.