A 54.8-nW, 256-bit Codeword Temperature-Robust Wake-Up Receiver minimizing False Wake-Ups for Ultra-Low-Power IoT Systems

• Published in: 2022 29th IEEE International Conference on Electronics, Circuits and Systems (ICECS) pp. 1 - 4
• Main Authors: D'Addato, M., Elgani, A. M., Perilli, L., Scarselli, E. Franchi, Gnudi, A., Canegallo, R., Ricotti, G.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 24.10.2022
• Subjects: Clock and Data Recovery; Internet of Things; IoT; Logic gates; Receivers; Sensitivity; Temperature Compensation; Temperature distribution; Temperature measurement; Temperature sensors; Ultra-Low-Power; Wake-Up Receiver
• DOI: 10.1109/ICECS202256217.2022.9970811

This paper presents a Wake-Up Receiver for ultra-low-power IoT systems requiring robustness against temperature variations and false wake-ups. The former is accomplished by implementing a dedicated biasing block to ensure a roughly constant Analog Front-End input impedance and matching network gain over temperature. The latter is achieved thanks to a data-startable baseband logic featuring a Gated Oscillator Clock and Data Recovery circuit, which allows the reception of 256-bit codewords. A prototype was fabricated in an STMicroelectronics 90-nm CMOS technology; it receives 1-kbps OOK-modulated packets with a 433-MHz carrier frequency and consumes 54.8 nW with a 0.6-V supply voltage. The measured sensitivity at room temperature is −49.5 dBm with a 10 −3 Missed Detection Ratio and its variation is 6 dB over a −40 °C to + 95 °C temperature range. Zero false wake-ups were detected transmitting random packets for 60 hours, resulting in an overall reduction in the IoT node energy consumption.