NDLI: 180-nm CMOS Wideband Capacitor-Free Inductively Coupled Power Receiver and Charger

Content Provider	IEEE Xplore Digital Library
Author	Lazaro, O. Rincon-Mora, G.A.
Copyright Year	1966
Abstract	Wireless microsystems like biomedical implants and embedded sensors derive energy from tiny in-package sources that, unfortunately, exhaust easily, which means that operational life is short. Periodically coupling power wirelessly is one way of replenishing onboard batteries, except that small receiver coils suffer from low coupling factors k_C and induce low electromotive-force voltages. Today, receivers store and resonate incoming energy between the receiving coil and an off-chip capacitor until the voltage rises sufficiently high for a diode-bridge rectifier to steer power into a battery. The capacitor, however, requires board space and constrains the source to a particular frequency. The 180-nm CMOS power receiver presented in this paper removes the diode bridge, which establishes a minimum voltage below which the system cannot derive power, so that neither tuning nor a resonating capacitor is necessary. Experimental measurements show that the system draws power from 30-mV signals when k_C is 0.0046 and coil separation is 11.35 mm, and this threshold voltage only changes 13.6 mV across 100-150 kHz, which is a 27.1% lower threshold voltage that is 36 × less sensitive than its resonating counterpart. The peak efficiency of the receiver when rectifying to 1.2 V is 82% at 224 μW and 125 kHz and average efficiency is 76% for 90-386-mV coil voltages.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	2839
Ending Page	2849
Page Count	11
File Size	4281624
File Format	PDF
ISSN	00189200
Volume Number	48
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Receivers Logic gates Coils Capacitors Switches Batteries Magnetic resonance wireless power transfer Contactless charging inductively coupling inductive power transmission low-threshold rectifier
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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