A 4.78µs Dynamic Compensated Inductive Coupling Transceiver for Ubiquitous and Wearable Body Sensor Network

概要

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A Real-time Capacitor Compensation (RCC) scheme is proposed for low power and continuous communication in the wearable inductive coupling transceiver. Since inductance values of wearable inductor vary dynamically with deterioration of its communication characteristics, the inductance value is monitored and its resonance frequency is adjusted by additive parallel/serial capacitors in real time. RLC Bridge for detection of the inductance variations and the Dual-edge Sampling Comparator for recognition of the variance direction are proposed. It is implemented in a 0.18µm CMOS technology, and it occupies a 1 × 2.7mm2 chip area. The proposed transceiver consumes only 426.6µW at 4Mbps data rate. The compensation time takes 4.78µs, including 3µs of detection and 1.78µs for compensation process in worst case.