A 144-MHz Fully Integrated Resonant Regulating Rectifier with Hybrid Pulse Modulation for mm-Sized Implants

Chul Kim, Sohmyung Ha, Jiwoong Park, Abraham Akinin, Patrick P. Mercier, Gert Cauwenberghs

Research output: Contribution to journalArticle

Abstract

This paper presents a fully integrated resonant regulating rectifier (IR3) with an on-chip coil used to wirelessly power mm-sized implants. By combining rectification and regulation in a single stage, and controlling this stage via a hybrid pulse-width modulation and pulse-frequency modulation (PFM) feedback scheme, the IR3 avoids efficiency-limiting cascaded losses while enabling tight voltage regulation with low dropout and ripple. The IR3 is implemented in 0.078 mm2 of active area in 180-nm Silicon oxide insulator (SOI) CMOS, and achieves a 1.87% ΔVDD/VDD power supply regulation ratio with a 1-nF decoupling capacitor despite a tenfold load current variation from 8 to 80 μA. A 0.8-V VDD is maintained at a 8-kΩ load for 144-MHz RF inputs ranging from 0.98 to 1.5 V. At 1-V regulation, the voltage conversion efficiency is greater than 92% with less than 5.2-mVpp ripple, while the power conversion efficiency is 54%. The measured overall wireless power transfer system efficiency, from the primary coil to VDD output of the IR3, is 2% at 160-μW load, and reaches 5% at 700 μW.

Original languageEnglish (US)
Article number8013680
Pages (from-to)3043-3055
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume52
Issue number11
DOIs
StatePublished - Nov 2017

Keywords

  • mm-sized implant
  • on-chip coil
  • pulse-frequency modulation
  • pulse-width modulation (PWM)
  • regulating rectifier
  • wireless power transfer (WPT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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