Low-Power CMOS Smart Temperature Sensor With a Batch-Calibrated Inaccuracy of ±0.25 °C (±3σ) from −70 °C to 130 °C

In this paper, a low-power CMOS smart temperature sensor is presented. The temperature information extracted using substrate PNP transistors is digitized with a resolution of 0.03 °C using a precision switched-capacitor (SC) incremental<br/> A/D converter. After batch calibration, an inaccuracy of ±0.25 °C (±3σ ) from −70 °C to 130 °C is...

Low cost calibration techniques for smart temperature sensors

Smart temperature sensors generally need to be trimmed to obtain measurement errors below ±2°C. The associated temperature calibration procedure is time consuming and therefore costly. This paper presents two, much faster, voltage calibration techniques. Both make use of the fact that a voltage proportional to absolute temperature (PTAT) can be...