A dynamic real-time capacitor compensated inductive coupling transceiver for wearable body sensor network

A real-time capacitor compensation (RCC) scheme is proposed for low power wearable inductive coupling transceiver. To compensate for the dynamic parameter variations in real time, the inductance value is monitored and its resonance frequency is adjusted by additive capacitors. RLC bridge for detection of the inductance variations and the dual-edge sampling comparator for recognition of the variance direction are proposed. The proposed transceiver consumes only 426.6µW (102.6µW for TRX and 324µW for CDR) in a 0.18µm CMOS technology. And the compensation time takes only 4.78µs, including 3µs of detection and 1.78µs for compensation process in worst case.