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Measurements, simulations and equations show that differential and single-ended ring oscillators have comparable performance when subjected to the same deterministic noise sources. Both topologies are shown to have a much greater sensitivity to supply noise than substrate noise. It is also shown that symmetrical/asymmetrical noise injection must be considered. The measured results are compared to predictive jitter equations and Spectre® time domain simulations. It is shown that the measurements are in agreement with the simulations and equations.
Date of Conference: 2002