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Precise delay generation using coupled oscillators

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2 Author(s)
Maneatis, J.G. ; Stanford Univ., CA, USA ; Horowitz, M.A.

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- mu m 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.<>

Published in:

Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International
RFIC Virtual Journal, IEEE

Date of Conference:

24-26 Feb. 1993

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