A 2.4 GHz Wireless Temperature Sensor with 0.93 C precision designed in 130 nm CMOS technology for Internet of Things applications

Abstract

Temperature sensors are present in many applications within the context of the Internet of Things, such as monitoring people, equipment, homes, industries, among others. Some of these portable devices need low power consumption, be compact, and have a linearity range for their application. There- fore, this work proposes a wireless temperature sensor developed in 130-nanometer CMOS technology, designed to operate in the 2.4 GHz ISM band. The wireless sensor was developed using exclusively open-source EDA tools and the Skywater 130 nm openPDK. The devices linearity as evaluated between -50C to 200C, demonstrating a maximum inaccuracy of 0.93 C in a range from 12.0 C to 144.0 C, while consuming only 1.6 mW and occupying an area of 0.028 mm, including the RF block. Additionally, this work was compared with sensors reported in the state of the art and its area and maximum error were smaller.