A 2.4 GHz Wireless Temperature Sensor designed in 130 nm CMOS technology with 0.07 °C precision from -100 °C to 200 °C

Temperature sensors are present in various devices, and within the context of the Internet of Things, these devices need to have low power consumption, be compact, and have an adequate linearity range for their application. Therefore, this work proposes a wireless temperature sensor developed in 130-nanometer CMOS technology, designed to operate in the ISM band at 2.4 GHz. The wireless sensor was developed using only open-source EDA tools and the Skywater 130 nm openPDK. Post-layout transient simulations were performed at different temperatures, demonstrating a precision of 0.07 C over a temperature range of -100 to 200 C, while consuming only 1.5 mW and occupying an area of 0.04 mm² including the RF transmitter. Furthermore, this work was compared with sensors reported in the literature. While its power consumption was similar to other sensors, its area was smaller and its maximum error was lower than most of the compared sensors. Additionally, the proposed sensor had a greater range of linearity than all of the compared sensors.