Energy Detector Based on MEMS-CMOS Co-Design for Wake-Up Receivers

This paper presents a novel resonant energy detector (RED) based on MEMS-CMOS co-design for wake-up receivers (WuRX) so as to improve the anti-interference capability significantly. The proposed RED presents different down-conversion coefficient at different frequencies, and high-performance filtering can be achieved through the down-conversion process of RED. Using the same inductor-based matching network in the preceding stage, the proposed RED achieves 16 dB better signal to interferer ratio (SIR) and 0.5 dB better voltage gain when compared with a traditional ED. Furthermore, the 3-dB bandwidth (BW) of the radio frequency (RF) front-end is only 15 MHz which is comparable to that of MEMS matching networks and much lower than that of inductor based matching networks. The demonstrated RED significantly improves the WuRX’s filtering performance without sacrificing the sensitivity, which is proven to be an effective way to suppress interferers in WuRXs.