Patent ID: 6775321
Filing Date: 2004-08-10
Classification: G01R

Abstract:
A jitter measurement apparatus comprising:an analytic signal transformer for transforming a signal under measurement into a complex analytic signal; an instantaneous phase estimator for obtaining an instantaneous phase of the signal under measurement from the complex analytic signal transformed by said analytic signal transformer; a linear instantaneous phase estimator for obtaining a linear instantaneous phase of an ideal signal that does not contain a jitter by obtaining a least mean square line of the estimated instantaneous phase; a zero-crossing timing estimator for obtaining a zero-crossing timing of the signal under measurement using any one of an interpolation method and an inverse interpolation method; a timing jitter estimator for calculating a difference between an instantaneous phase value of the signal under measurement and a linear instantaneous phase value of the ideal signal at the zero-crossing timing estimated by said zero-crossing timing estimator to obtain a timing jitter sequence; and a jitter detector to which the timing jitter sequence is supplied for obtaining a jitter of the signal under measurement.