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Equation 16 provides a practical means for measuring the standard deviation of jitter, ,. If the aperture time and sampling interval are approximately equal, Equation 16shows that the noise spectral density due to jitter increases from zero at zero frequency to a maximum at the Nyquist sampling frequency. Therefore, by digitizing a constant signal, } can be determined from the component of the powerdensity spectrum of the signal that both increases with the mean of the signal and varies with respect to frequency according to Equation 16 (13).

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