A 5nW Wake-Up Receiver With Better Than -63dBm Sensitivity via an Active Pseudo-Differential Envelope Detector
University of California - San Diego La Jolla United States
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A 402-405 MHz MICS-band wake-up receiver is presented that achieves -63.8 dBm sensitivity at 4.5 nW. High sensitivity at 400 MHz is accomplished via an 18.5 dB passive voltage gain transformer filter loaded by a high input impedance Rin 30 kOhm, high scaling factor kED 300, 1.8 nW current re-use pseudo-balun envelope detector, while low power is achieved by operating all active circuits, including the regenerative comparator, baseband correlator, and temperature compensated relaxation oscillator in sub-threshold with a single 0.4 V supply. The chip is fabricated using 0.18 m CMOS SOI process and achieves the highest figure of merit of all direct envelope detection-based wake-up receivers operating above 400 MHz.
- Radio Communications
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation