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This paper presents an always-on low-power wake-up receiver (WuRx) thatactivates the remainder of the system when a wake-up signal is detected. Theproposed receiver has two phases of waking up. The first phase uses anintegrated CMOS Schottky diodes to detect the signal power at a low biascurrent. The approach dissipates low quiescent power and allows the reuse ofthe design in multiple frequency bands with only modifying the matchingnetwork. In the second phase, a data-locked startable oscillator is proposed tocorrelate the received data with a target signature. This design eliminates thearea and power dissipation of an external crystal oscillator and only turns onwhen the second phase is activated. By correlating to a target signature, thesecond phase also reduces the probability of a false alarm (PFA) that wouldotherwise wake up the high-power bulk of the system. The two-phase approachleads to significant reduction in average power consumption when compared to asingle-phase design. This implementation targets sub-ms wake-up latency andoperates in the unlicensed band at a 750-MHz carrier frequency with a data rateof 200 kbps. The design achieves $\sim$8.45pJ/bit and $<$-50 dBm of inputsensitivity and average power of 1.69$\mu$W. The system is implemented in 65-nmCMOS technology and occupies an area of 1mm$\times$0.75mm.

A Schottky-Diode-Based Wake-Up Receiver for IoT Applications