An Ultra-Low Power Time-Domain Temperature Sensor for IoT Applications

Abstract

This paper proposed an ultra-low power time-domain temperature sensor circuit for IoT applications. It uses 2-T structures to generate reference voltage and complementary-to-absolute-temperature (CTAT) voltage. The reference voltage produces reference current by using current mirror to charge the capacitor. Then the voltage of capacitor is compared with the CTAT voltage to generate a temperature-dependent pulse. The pulse width is then digitized to represent the temperature. The temperature sensor is designed using 0.18 μm CMOS process. The simulation results show that it measures temperature from −10°C to 60°C from 1 V supply voltage. The power it costs is 570 nW at a conversion speed of 100 Sa/s.

Xueting Pang

M.Sc.

My research interests include circuit design of temperature sensors.

Kangkang Sun

PhD Student

My research interests include circuit design of analog to digital converter for biomedical applications and SAR ADC.

Jian Guan

PhD Student

My research interests include the design of solar cells and energy harvesting circuits.

Yuqi Lin

M.Sc.

My research interests include digital circuit design.

Zhipeng Li

PhD Student

My research interests include circuit design of image sensors and energy harvesting circuits.

Feng Yan

PhD Student

My research interests include circuit design of analog front end for biomedical applications and sensor interfaces.

Jingjing Liu

Associate Professor

My research interests include low-power smart micro-sensor integrated circuit design, image sensors, biomedical sensors, and energy harvesting circuits.