A 0.015-mm2 60-GHz reconfigurable wake-up receiver by reusing multi-stage LNAs

An area-efficient 60-GHz wake-up receiver (WuRx) using reconfiguration techniques of multistage low-noise amplifiers (LNAs) is presented. The gain stages of the 60-GHz LNA are reused as the envelope detectors for the wake-up receiver. Therefore, the bulky components such as extra switches between the wake-up receiver and the LNA, additional antennas, and excess input matching network can be removed in the design of the wake-up receiver. Furthermore, due to the reconfigurability of the LNA, the wake-up receiver can work in sensitivity-boost mode by using several LNA gain stages as a pre-amplifier. The wake-up receiver is fabricated in a 65-nm CMOS process occupying a core area of 0.015 mm (excluding the LNA). The WuRx achieves the sensitivity of -46 dBm and -60 dBm with a power consumption of 64 μW and 12.7 mW, respectively.