Patent ID: 8562210
Filing Date: 2013-10-22
Classification: G01K

Abstract:
1. A temperature sensing circuit for measuring temperature in-situ in an operating circuit comprising: a first resistor connected to a first node and to a second node; a second resistor connected to the second node and to a third node; a third resistor connected to the third node and to a fourth node; and a fourth resistor connected to the fourth node and to the first node, where: one pair of the first node/third node and second node/fourth node is adapted for receiving an input voltage and the other pair of the first node/third node and second node/fourth node is adapted for providing an output voltage; an NFET whose source/drain regions are coupled to the other pair of the first node/third node and second node/fourth node providing the output voltage; and a fifth resistor coupled to a gate of the NFET, wherein a voltage across the fifth resistor correlates with and amplifies a temperature change in a thermally sensitive resistive material layer, wherein one of the first resistor, second resistor, third resistor and fourth resistor comprises said thermally sensitive resistive material layer within the operating circuit and the other three of the first resistor, the second resistor, the third resistor and the fourth resistor are thermally isolated from the operating circuit.