An Intrabody Power Transfer System With Continuous Maximum Resonant Power Tracking

Hyungjoo Cho, Ji Hoon Suh, Gichan Yun, Sohmyung Ha, Minkyu Je

Research output: Contribution to journalArticlepeer-review


In this letter, we present an intrabody-power-transfer (IBPT) system that delivers power greater than 100μW even across a 150-cm on-body distance. The proposed IBPT TX employs an FLL-based maximum-resonant-power-tracking (MRPT), which runs in the background to maximize the power delivered to the load (PDL). The proposed technique does not require any RX-to-TX back telemetry or searching phase, thus enabling uninterrupted power delivery. The PDL and power transfer efficiency are further improved by inducing parallel resonance at RX. Fabricated in a 180-nm BCD process, the proposed IBPT system achieves 136-μW PDL at 1.8-V dc output with 8.83% end-to-end power efficiency.

Original languageEnglish (US)
Pages (from-to)105-108
Number of pages4
JournalIEEE Solid-State Circuits Letters
StatePublished - 2023


  • Body-area network (BAN)
  • body-channel model
  • energy harvesting (EH)
  • intrabody power transfer (IBPT)
  • wearable sensor nodes
  • whole-body powering

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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