A Low-EMI Fully Integrated Switched-Capacitor DC/DC Converter

Simon Kennedy, Mehmet Rasit Yuce, Jean Michel Redoute

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper presents a novel fully integrated step-up dc/dc converter containing circuits to improve electromagnetic emissions. This design utilizes current sources to limit the impulsive current flow into the integrated flying capacitors. This reduces the discontinuous pulse currents normally associated with capacitive converters causing electromagnetic interference (EMI). A variable reference current enables the converter to operate with the lowest possible emissions through the entire operating range and is used to regulate the output voltage. The inclusion of low EMI techniques enables fully integrated power converters to be implemented in systems where noise produced by converters currently restricts or prohibits their use. The proposed 3.2 mW voltage doubler was fabricated in a 0.18  μm CMOS process. With an input voltage range of 1–1.8 V, the converter produces a 1.6–3.3 V output. Experimental results verify the reduction of emissions to meet IEC 61967-4 Class L using current control with a reduction of noise voltage when compared with the circuit without the proposed techniques.

Original languageEnglish
Pages (from-to)225-233
Number of pages9
JournalIEEE Transactions on Electromagnetic Compatibility
Volume60
Issue number1
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • Charge-pump
  • Electromagnetic compatibility
  • Switched-capacitor dc–dc converter
  • Switching noise
  • Voltage doubler

Cite this

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title = "A Low-EMI Fully Integrated Switched-Capacitor DC/DC Converter",
abstract = "This paper presents a novel fully integrated step-up dc/dc converter containing circuits to improve electromagnetic emissions. This design utilizes current sources to limit the impulsive current flow into the integrated flying capacitors. This reduces the discontinuous pulse currents normally associated with capacitive converters causing electromagnetic interference (EMI). A variable reference current enables the converter to operate with the lowest possible emissions through the entire operating range and is used to regulate the output voltage. The inclusion of low EMI techniques enables fully integrated power converters to be implemented in systems where noise produced by converters currently restricts or prohibits their use. The proposed 3.2 mW voltage doubler was fabricated in a 0.18  μm CMOS process. With an input voltage range of 1–1.8 V, the converter produces a 1.6–3.3 V output. Experimental results verify the reduction of emissions to meet IEC 61967-4 Class L using current control with a reduction of noise voltage when compared with the circuit without the proposed techniques.",
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A Low-EMI Fully Integrated Switched-Capacitor DC/DC Converter. / Kennedy, Simon; Yuce, Mehmet Rasit; Redoute, Jean Michel.

In: IEEE Transactions on Electromagnetic Compatibility, Vol. 60, No. 1, 01.02.2018, p. 225-233.

Research output: Contribution to journalArticleResearchpeer-review

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