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Jitter in ring oscillators

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1 Author(s)
McNeill, J.A. ; Worcester Polytech. Inst., MA, USA

Jitter in ring oscillators is theoretically described, and predictions are experimentally verified. A design procedure is developed in the context of time domain measures of oscillator jitter in a phase-locked loop (PLL). A major contribution is the identification of a design figure of merit κ, which is independent of the number of stages in the ring. This figure of merit is used to relate fundamental circuit-level noise sources (such as thermal and shot noise) to system-level jitter performance. The procedure is applied to a ring oscillator composed of bipolar differential pair delay stages. The theoretical predictions are tested on 155 and 622 MHz clock-recovery PLL's which have been fabricated in a dielectrically isolated, complementary bipolar process. The measured closed-loop jitter is within 10% of the design procedure prediction

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 6 )
RFIC Virtual Journal, IEEE

Date of Publication:

Jun 1997

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