A Novel on-chip ultra-low power temperature sensing scheme

In this work, a CMOS based temperature sensor with Nano-watt power consumption is presented. The proposed scheme utilizes sensitivity of MOS towards temperature in subthreshold region. Sensor is composed of PMOS and NMOS group which subsequently generates voltages that are having positive and negative temperature coefficients respectively. It has been observed that on subtracting these voltages, resultant shows, highly linear dependence with temperature. The proposed scheme is implemented using AMS 0.35 µm standard CMOS technology, and it shows wide temperature sensing ranges from −40 °C to +140 °C with a power consumption of tens of Nano watts.