Design of a 10GHz clock distribution network using coupled standing-wave oscillators

  • Authors:
  • Frank O'Mahony;C. Patrick Yue;Mark A. Horowitz;S. Simon Wong

  • Affiliations:
  • Stanford University, Stanford, CA;Aeluros, Inc., Mountain View, CA;Stanford University, Stanford, CA;Stanford University, Stanford, CA

  • Venue:
  • Proceedings of the 40th annual Design Automation Conference
  • Year:
  • 2003

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Abstract

In this paper, a global clock network that incorporates standing waves and coupled oscillators to distribute a high-frequency clock signal with low skew and low jitter is described. The key design issues involved in generating standing waves on a chip are discussed, including minimizing wire loss within an available technology. A standing-wave oscillator, a distributed oscillator that sustains ideal standing waves on lossy wires, is introduced. A clock grid architecture comprised of coupled, standing-wave oscillators and differential, low-swing clock buffers is presented. The measured results for a prototyped standing-wave clock grid operating at 10GHz and fabricated in a 0.18μm 6M CMOS logic process are presented. A technique is proposed for on-chip skew measurements with sub-picosecond precision.