Apparatus for and method of measuring jitter

Details Apparatus for and method of measuring jitter Apparatus for and method of measuring jitter

2007-04-10

2007-04-10

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Testing

Phase error or phase jitter

C702S069000

Reexamination Certificate

active

09882290

ABSTRACT:
A signal under measurement is band-limited, and frequency components around a fundamental frequency of the signal under measurement are extracted. Waveform data (approximated zero-crossing data) close to zero-crossing timings of the band-limited signal are sampled, and phase error data between the approximated zero-crossing points and the corresponding zero-crossing points of the signal under measurement are calculated from the approximated zero-crossing data to obtain a zero-crossing phase error data sequence δ[k]. Then an instantaneous period sequence T(k) of the signal under measurement is obtained from the zero-crossing phase error data and sampling intervals Tk,k+1of the approximated zero-crossing data sequence. Then a period jitter sequence is obtained from differences between the T(k) and a fundamental period T0of the signal under measurement, and then the period jitter sequence is multiplied by T0/Tk,k+1to correct the period jitter sequence.

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Nelson Soo, PERICOM Application Brief AB36, “Jitter Measurement Techniques”.

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