A 0.25 mm²-Resistor-Based Temperature Sensor With an Inaccuracy of 0.12 °C (3σ) From -55 °C to 125 °C

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Abstract

This paper describes a compact, energy efficient, resistor-based temperature sensor that can operate over a wide temperature range (-55 °C-125 °C). The sensor is based on a Wheatstone bridge (WhB) made from silicided poly-silicon and non-silicided poly-silicon resistors. To achieve both area and energy efficiencies, the current output of the WhB is digitized by a continuous-time zoom analog-to-digital converter (ADC). Implemented in a standard 180-nm CMOS technology, the sensor consumes 52 μA from a 1.8-V supply and achieves a resolution of 280 μKrms in a 5-ms conversion time. This corresponds to a state-of-the-art resolution figure-of-merit (FoM) of 40 fJ · K². After a first-order fit, the sensor achieves an inaccuracy of ±,0.12 °C (3σ) from -55 °C to 125 °C.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalIEEE Journal of Solid State Circuits
DOIs
Publication statusE-pub ahead of print - 2018

Keywords

  • Continuous-time delta–sigma modulator ( CTΔ Σ M)
  • energy efficiency
  • non-linearity correction
  • smart sensors
  • temperature sensor

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