A 667-Mb/s operating digital DLL architecture for 512-Mb DDR SDRAM

Takeshi Hamamoto, Kiyohiro Furutani, Takashi Kubo, Satoshi Kawasaki, Hironori Iga, Takashi Kono, Yasuhiro Konishi, Tsutomu Yoshihara

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

This paper describes an all-digital delay-locked loop (DLL) architecture for over 667 Mb/s operating double-data-rate (DDR) type SDRAMs, which suppresses skews and jitters. Two novel replica adjusting techniques are introduced, in which timing skews caused by the clock input and data output circuits are reduced by a hierarchical phase comparing architecture and a replica check method with slow tester. Further, an improved phase interpolating method suppresses jitters caused by a boundary of the fine and coarse delays. A 512-Mb test device is fabricated using a 0.13-μm DRAM process technology, in which skew and jitter suppressed 667-Mb/s (333-MHz) DDR operation has been verified.

Original languageEnglish
Pages (from-to)194-206
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume39
Issue number1
DOIs
Publication statusPublished - 2004 Jan
Externally publishedYes

Keywords

  • Delay lines
  • Delay-locked loops (DLLs)
  • DRAM chips
  • High-speed techniques
  • Jitter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Hamamoto, T., Furutani, K., Kubo, T., Kawasaki, S., Iga, H., Kono, T., Konishi, Y., & Yoshihara, T. (2004). A 667-Mb/s operating digital DLL architecture for 512-Mb DDR SDRAM. IEEE Journal of Solid-State Circuits, 39(1), 194-206. https://doi.org/10.1109/JSSC.2003.820851