Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1994-11-14
1997-06-17
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
327512, 374172, G01K 701
Patent
active
056391633
ABSTRACT:
A pair of on-chip thermal sensing diodes are formed together and interconnected with a common cathode to form a differential sensing pair. A pair of precision resistors external to the chip generates two constant currents, one for each diode, with a ratio of one to the other on the order of 100 to 1. The precision resistor values are selected so that variations about the nominal values of metal and via resistances between the diode contacts and the chip contact pads (e.g. C4 contacts) are negligible compared to the precision resistor values. Leads, connected respectively to two pads on the chip, couple a differential output of the anode voltages of the diode pair to the input of a high impedance amplifier.
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Bosco Francis Edward
Davidson Evan Ezra
Vakirtzis Charles Kyriakos
Augspurger Lynn L.
Gutierrez Diego F. F.
International Business Machines - Corporation
Marhoefer Laurence J.
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