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DIE TEMPERATURE SENSOR CIRCUIT

  • US 20120133422A1
  • Filed: 11/29/2010
  • Published: 05/31/2012
  • Est. Priority Date: 11/29/2010
  • Status: Active Grant
First Claim
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1. 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, wherein the temperature sensor generates, at an output terminal, a voltage VOUT that varies proportionally with temperature of the temperature sensor.

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