Abstract
Clock rate adaptation circuits of network synchronizers work by controlling the output data rate by pulse stuffing. The technique of Stuff Threshold Modulation (ST-Mod) is usually used to reduce the waiting time jitter resulting due to pulse stuffing. In this paper, a detailed study of the technique of Stuff Threshold Modulation is provided. A method of determining an optimum ST-Mod scheme for an arbitrary phase-locked loop characteristic and a specified range of synchronizer clock frequency offsets is formulated in the paper. It is shown that if the ST-Mod sequence is selected as a saw-tooth sequence then it is possible to choose a dither sequence which is optimum for a given synchronizer–desynchronizer operating condition. It is demonstrated that using a combination of random sequence and modified wave sequence it is possible to obtain near-optimal filtered jitter for given synchronizer–desynchronizer characteristics.
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