Chip-to-chip power delivery by inductive coupling with ripple canceling scheme

Yuxiang Yuan, Yoichi Yoshida, Nobuhiko Yamagishi, Tadahiro Kuroda

Research output: Contribution to journalArticle

3 Citations (Scopus)


Wireless power delivery between stacked chips makes system in a package (SiP) more compact and reconfigurable. However, to reduce the ripple of recovered voltage, a large on-chip filter capacitor is required, which is chip-area-inefficient. A multiphase power transmission approach is proposed to solve this problem. We implemented an inductive-coupling power delivery system with four power transmission channels. The clock of each channel has a μ/2 phase delay against the previous channel, and the outputs of all the channels are connected in parallel to a filter capacitor and a load. The measurement results show that the multiphase approach successfully reduced the ripple of the voltage from 200 mV at one channel to 15 mV at four channels. The test chip is fabricated using 0.18 μm standard complementary metal oxide semiconductor (CMOS) process.

Original languageEnglish
Pages (from-to)2797-2800
Number of pages4
JournalJapanese journal of applied physics
Issue number4 PART 2
Publication statusPublished - 2008 Apr 25



  • Inductive coupling
  • Multiphase power conversion
  • Ripple cancellation
  • Stacked chips
  • Wireless power delivery

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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