Patent ID: 7778319
Filing Date: 2010-08-17
Classification: G01R

Abstract:
1. A jitter measuring apparatus, for measuring jitter in a data-signal-under-measurement, comprising: a first pulse generator for detecting edges of said data-signal-under-measurement to output a first pulse signal having a pulse width set in advance corresponding to said edge: a second pulse generator for detecting boundaries of data sections where data values do not change in said data-signal-under-measurement to output a second pulse signal having a pulse width set in advance corresponding to timing of the detected boundaries of said data sections; a filter for removing carrier frequency components of said data-signal-under-measurement from said first and second pulse signals; and a complementary data signal generating section for generating a complementary data signal having edges at every boundary of the data sections over which data values of said data-signal-under-measurement do not change and said data-signal-under-measurement has no edge, wherein said second pulse generator outputs said second pulse signal corresponding to the edge of said complementary data signal, wherein said complementary data signal generating section generates said complementary data signal by which the edges of said data-signal-under-measurement and of said complementary data signal are arranged at almost equal intervals when they are aligned in the same time axis.