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A new method for computation of timing jitter in a PLL is proposed. The computational method is based on the representation of the circuit as a linear time-varying system with modulated stationary noise models, spectral decomposition of stochastic process and decomposition of noise into orthogonal components i. e. phase and amplitude noise. The method is illustrated by examples of jitter computation in PLLs.Eyt () 2

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-The paper presents a new approach to the problem of automatic order reducing of rational transfer function (TF). The approach is directed to obtain low-order models under criterion of minimal integral square error. The developed computational scheme allows to determine reduced model of the minimal order with the given error tolerance.