Variable supply-voltage scheme for low-power high-speed CMOS digital design

Tadahiro Kuroda, Kojiro Suzuki, Shinji Mita, Tetsuya Fujita, Fumiyuki Yamane, Fumihiko Sano, Akihiko Chiba, Yoshinori Watanabe, Koji Matsuda, Takeo Maeda, Takayasu Sakurai, Tohru Furuyama

Research output: Contribution to journalArticlepeer-review

204 Citations (Scopus)


This paper describes a variable supply-voltage (VS) scheme. From an external supply, the VS scheme automatically generates minimum internal supply voltages by feedback control of a buck converter, a speed detector, and a timing controller so that they meet the demand on its operation frequency. A 32-b RISC core processor is developed in a 0.4-μm CMOS technology which optimally controls the internal supply voltages with the VS scheme and the threshold voltages through substrate bias control. Performance in MIPS/W is improved by a factor of more than two compared with its conventional CMOS design.

Original languageEnglish
Pages (from-to)454-461
Number of pages8
JournalIEEE Journal of Solid-State Circuits
Issue number3
Publication statusPublished - 1998 Mar
Externally publishedYes


  • Buck converter
  • Low power CMOS circuits
  • Low threshold voltage
  • Low voltage

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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