A 1.3-µW −0.3/+0.27°C Inaccuracy Fully-integrated Temperature Sensor Based on a Pre-Charge Relaxation Oscillator for IoT applications
- Resource Type
- Conference
- Authors
- Tan, Yi; Liu, Zexue; Hao, Xiucheng; Shen, Zhengkun; Jiang, Haoyun; Tian, Fan; Liu, Junhua
- Source
- 2019 IEEE Asia-Pacific Microwave Conference (APMC) Asia-Pacific Microwave Conference (APMC), 2019 IEEE. :42-44 Dec, 2019
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Temperature sensors
Temperature measurement
Oscillators
Internet of Things
Integrated circuits
Calibration
Radiofrequency identification
temperature sensor
Internet of Things (IoT)
wireless sensor network
low power
CMOS
- Language
This paper presents a CMOS fully-integrated temperature sensor based on a relaxation oscillator for IoT applications. To reduce power consumption, this sensor utilizes the half-period pre-charge compensation relaxation oscillator and uses a time-to-digital convertor (TDC) instead of analog-to-digital convertor (ADC) to count. Besides, the current distribution circuit is employed to improve temperature accuracy. The proposed sensor is implemented in 0.18 µm CMOS and occupies an area of 0.11 mm 2 . Measurement results show that the temperature sensor achieves an inaccuracy of −0.3/+0.27 °C across −15°C to 65°C after 2-point calibration. The chip consumes 1.3 µW at 27°C with a 650 mV voltage supply.