A low power temperature sensor for IOT applications in CMOS 65nm technology

Abstract

This paper describes the architecture of a smart temperature sensor designed in CMOS 65nm technology node, intended for IOT and RFID applications. The shift of the trimming circuitry and of a portion of the readout operations into the digital domain, combined with a reduced design complexity in the sensor analog front-end, allow the minimization of the power consumption. The maximum inaccuracy of the sensor, obtained by means of a two point calibration, is ±0.3°C over the [−40°C÷125°C] temperature range, with an average power consumption of 375 nW at a conversion speed of 1 Sa/s.