A 14-GHz AC-coupled clock distribution scheme with phase averaging technique using single LC-VCO and distributed phase interpolators

Kiichi Niitsu, Vishal V. Kulkarni, Shinmo Kang, Hiroki Ishikuro, Tadahiro Kuroda

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    In this paper, we report the world's first ac-coupled clock distribution circuit for low-power and high-frequency clock distribution. By employing the proposed ac-coupled LC-based voltage-controlled oscillator (LC-VCO) and phase interpolators, the use of conventional current-mode-logic (CML) buffers with large power requirements can be prevented, and power consumption for clock distribution can be reduced. With the aim of verifying the effectiveness of the proposed circuit, test chips were designed and fabricated in 0.18-μm mixed-signal CMOS technology. The measured results indicated a 14.007 GHz clock distribution to four points whose pitches are 450 μ m, with 6.9 mW of power. The phase noise was measured to be -79.06 dBc/Hz at a 100 kHz offset, - 101.66 dBc/Hz at a 1 MHz offset, and -107.25 dBc/Hz at a 10 MHz offset, with a clock frequency of 12.96 GHz. Furthermore, a phase averaging technique for reducing phase deviation was proposed and theoretically investigated.

    Original languageEnglish
    Article number5590276
    Pages (from-to)2058-2066
    Number of pages9
    JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
    Volume19
    Issue number11
    DOIs
    Publication statusPublished - 2011 Nov 1

    Keywords

    • CMOS integrated circuits (ICs)
    • Clock distribution
    • LC-based voltage-controlled oscillator (LC-VCO)
    • low-power design
    • voltage-controlled oscillator (VCO)
    • wireless communication

    ASJC Scopus subject areas

    • Software
    • Hardware and Architecture
    • Electrical and Electronic Engineering

    Fingerprint Dive into the research topics of 'A 14-GHz AC-coupled clock distribution scheme with phase averaging technique using single LC-VCO and distributed phase interpolators'. Together they form a unique fingerprint.

  • Cite this