Publication: Human body temperature sensor based on ring oscillator
Loading...
Date
2024-07
Authors
Arun a/l Selvam
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
In addition to blood pressure, heart rate, and breathing rate, one of the four critical signs that are typically seen in a medical situation is the patient’s body
temperature. As a result, the main goal of this project is to investigate and employ ring oscillators as human body temperature sensors. The main objectives of this research are to reduce the voltage reference’s sensitivity to temperature values below 0.1 and to achieve high frequency performance, low current operation within a 35°C operating range. Using 0.18 µm technology, the temperature sensor design is implemented in Virtuoso Cadence under SILTERRA. As previously noted, a full custom design flow is followed. The supply current of ring oscillators, which function as pulse generators, increases with temperature. The oscillator output frequency increases and changes at the same time. Human body temperature is sensed using this concept. When the VDD supplies 1.8 V, the temperature sensor measurement of 35 °C . For your information, the sensor requires a high-speed pulse generator with a central frequency of fosc = 793.65 MHz and a current flow of less than 30 µA.