Patent ID: 8378735

Claim:
A temperature sensor, comprising: an amplifier, the amplifier including a first bipolar transistor and a second bipolar transistor configured as an input differential pair of the amplifier, the first bipolar transistor having a first collector current density, and the second bipolar transistor having a second collector current density different from the first collector current density of the first bipolar transistor, wherein the amplifier is configured such that, when the first and second bipolar transistor having a same temperature, an input offset voltage is equal to a voltage difference between a base-to-emitter voltage of the first bipolar transistor and a base-to-emitter voltage of the second bipolar transistor, such voltage difference being proportional to absolute temperature; and an output stage for amplifying such voltage difference, the output stage including an output transistor having a control electrode coupled to the amplifier, a first current electrode coupled to a first power supply voltage terminal, and a second current electrode, and a resistance divider comprising resistive element R 1 , resistive element R 2 and resistive element R 3 , respectively, connected in series, with one end of the series coupled the second current electrode of the output transistor and with another end of the series coupled to a second power supply voltage terminal, wherein the temperature sensor generates, at an output terminal, a voltage V OUT that varies proportionally with temperature of the temperature sensor.