A 15μW Low Cost CMOS Smart Temperature Sensor

A CMOS-based simple, low cost, low power, integrated smart temperature sensor with inaccuracy of less than ±1.8°C with 7 output bits in the wide temperature range of -40°C to 125°C is presented. The proposed design uses only MOS transistors and hence can be realized in any standard CMOS process without the need for bipolar transistors. The proposed design produces a digital representation of temperature using a successive approximation algorithm without the need of an explicit analog to digital converter and hence saves on power and area and reduces design complexity. The average power consumption of the sensor is 15uW in less than 20us conversion time and occupies a chip area of less than 0.083mm2 in a standard TSMC 180 nm CMOS process.