A digitally controlled switching regulator with reduced conductive EMI spectra

Chien Hung Tsai, Chun Hung Yang, Jui Chi Wu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


This paper presents the use of a combined random pulse position modulation (RPPM)/digital pulsewidth modulation (DPWM) digital controller for a buck converter to simultaneously achieve low-conductive electromagnetic interference (EMI) and a fast transient response. An area-efficient RPPM/DPWM controller suitable for advanced system-on-chip integration is proposed and implemented in a field-programmable gate array-based prototype to verify its EMI-suppression capability. The experimental results for a 1.2-V digital buck converter show that the proposed digital switching regulator can switch between RPPM and DPWM modes smoothly and automatically. Closed-loop system measurements demonstrate that, compared to DPWM, up to 17.27 and 14.99 dB power spectra reductions are obtained in the input current and switching node, respectively.

Original languageEnglish
Article number6236153
Pages (from-to)3938-3947
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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