A 75-µW 2.4 GHz Wake-up Receiver in 65-nm CMOS for Neonatal Healthcare Application

A 2.4 GHz low power, Internet-of-Things (IoT) based system for neonatal health-care application is presented. The system includes an ultra-low power receiver compatible with a wearable device with interface-connectivity to the sensors and a controller. A novel design of a "wake-up" receiver architecture is presented, where an LC oscillator and a ring oscillator combination provides a desired ultra-low power solution. The proposed receiver front-end consists of a gm-boosting current-reuse based low noise amplifier (LNA) and a transmission-gate based passive switching mixer. The prototype is designed in a 65-nm CMOS technology. The simulation results show a gain of 14.9 dB while consuming 75μW from a 0.75 V supply. The LNA gain is 16 dB with a noise figure of 5.7 dB and IIP3 of 18.16 dBm.