Reference-less wake-up receiver with noise suppression and injection-locked clock recovery

• Published in: IET circuits, devices & systems devices & systems, 2020-03, Vol.14 (2), p.168-175
• Main Authors: Chen, Shih-En, Lin, Jhih-Syuan, Li, Hsin-Fang, Cheng, Kuang-Wei
• Format: Article
• Language: English
• Subjects: 1/f noise; 1/f noise suppression; bit rate 200 kbit/s; Circuits; clock and data recovery circuits; Clock recovery; CMOS; CMOS integrated circuits; Communication; complementary metal–oxide–semiconductor technology; Crystal oscillators; Data recovery; data recovery circuitry; direct radio-frequency envelope detection; Envelope detection; Feedback; frequency 2.4 GHz; injection-locked clock recovery; integrated Internet of things; interference suppression; Internet of Things; low-power electronics; Noise reduction; Noise sensitivity; noise suppression; on-chip clock generation; power 25.0 muW; Radio frequency; Receivers & amplifiers; reference-less ultra-low-power wake-up receiver; reference-less WuRx; Research Article; Sampling techniques; Sensors; Signal processing; size 90.0 nm; synchronisation; Transistors
• ISSN: 1751-858X; 1751-8598; 1751-8598
• DOI: 10.1049/iet-cds.2019.0195

A reference-less ultra-low-power wake-up receiver (WuRx) is proposed for the highly integrated Internet of things applications. The WuRx utilises a direct radio-frequency envelope detection technique with input synchronised switching to suppress 1/f noise and enhance the sensitivity. Moreover, injection-locked clock and data recovery circuitry is used to perform on-chip clock generation. A prototype 2.4 GHz WuRx is designed and implemented with 90 nm complementary metal–oxide–semiconductor technology. The chip area is 1.0 × 0.95 mm2. The measurement results show that the WuRx consumes 25 μW and achieves a sensitivity of −51.5 dBm for 200 kbps data rate.