Precise delay generation using coupled oscillators

  • Maneatis J
  • Horowitz M
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Abstract

An array oscillator, a series of coupled ring oscillators that achieves a delay resolution equal to a buffer delay divided by the number of rings, is described. Using a 2-μm n-well CMOS technology, delays as small as 30 ps are achieved at frequencies up to 200 MHz. An array oscillator structured as a two-dimensional array of buffers is shown. The integral linearity and differential nonlinearity versus position in the -22 mode measured from the output ports are shown. The frequency sensitivity to static supply voltage in the -12 mode is investigated. The measured static frequency rejection is less than 0.25% over most of the operating range for each mode. The characteristics and performance of the array oscillator as a voltage-controlled oscillator for each mode are summarized

Author-supplied keywords

  • 2 micron
  • 200 MHz
  • 30 ps
  • CMOS integrated circuits
  • array oscillator
  • buffer delay
  • coupled circuits
  • coupled oscillators
  • delay resolution
  • delays
  • differential nonlinearity
  • frequency sensitivity
  • integral linearity
  • n-well CMOS technology
  • ring oscillators
  • static frequency rejection
  • static supply voltage
  • variable-frequency oscillators
  • voltage-controlled oscillator

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Authors

  • J G Maneatis

  • M A Horowitz

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