Power supply independent temperature sensor

Details Power supply independent temperature sensor Power supply independent temperature sensor

1998-10-13

2000-12-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327 83, 327513, 374178, 323313, G05F 110

Patent

active

061572446

ABSTRACT:
A temperature sensor is fabricated in an integrated circuit in combination with another device such as a microprocessor using a fabrication technology that is suitable for fabricating the device. Operation of the temperature sensor is based on the bandgap physics of semiconductors using a bandgap reference circuit and an amplifier that generate two measurement voltages, a voltage that is temperature-dependent and a voltage that is temperature-independent. The temperature sensor includes a bandgap power supply circuit that supplies a power supply voltage that is very stable to drive the temperature sensor so that the temperature sensor generates an output signal that is essentially independent of the power supply voltage.

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P. Gray, R. Meyer, Analysis and Design of Analog Integrated Circuits, 3rd Ed., Chapter 4, Section A4.3.2. "Band-Gap-Referencing Biasing Circuits" pp. 338-346 (1993).
B. Song, P. Gray "A Precision Curvature-Compensated CMOS Bandgap Reference", IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, pp. 634-643 (Dec., 1983).

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