Simultaneous 6-Gb/s data and 10-mW power transmission using nested clover coils for noncontact memory card

Andrzej Radecki, Yuxiang Yuan, Noriyuki Miura, Iori Aikawa, Yasuhiro Take, Hiroki Ishikuro, Tadahiro Kuroda

Research output: Contribution to journalArticle

3 Citations (Scopus)


An inductive power and data transmission link for a noncontact memory card interface is reported. Nested clover coils improve signal-to-interference ratio and enable simultaneous power and data transmission. This capability is then used in the design of a closed-loop feedback system for improving power transfer efficiency. Interference cancellation mechanism is analyzed with both 3-D EM simulations and a newly developed compact model of coupled inductors. Performance of the proposed solutions was confirmed experimentally using a scaled-down stacked-chip prototype fabricated in a 65-nm CMOS process. Maximum data transmission rate is 6 Gb/s and the total power transfer efficiency is 5.2%-10.2% over a load resistance range of 0.1-2 k$\Omega$.

Original languageEnglish
Article number6247481
Pages (from-to)2484-2495
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Issue number10
Publication statusPublished - 2012



  • Analytical models
  • data communication
  • electromagnetic modeling
  • inductive power transmission
  • nonvolatile memory
  • power system stability

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this