Characterizing non-compensable jitter in an electronic signal

Details Characterizing non-compensable jitter in an electronic signal Characterizing non-compensable jitter in an electronic signal

2008-06-18

2011-12-27

Payne, David C. (Department: 2611)

Pulse or digital communications

Testing

Phase error or phase jitter

C375S224000

Reexamination Certificate

active

08085837

ABSTRACT:
One embodiment of the present invention processes a signal of interest through an optional reference channel, combines the resulting signal with white noise, and then processes the noisy signal through a reference receiver. Two metrics are calculated from the results of that processing: Non-Compensable Data-Dependent Jitter (NC-DDJ) and Enhanced Transmitter and Waveform Dispersion Penalty (Enhanced TWDP). Within the reference receiver, a variable delay module sweeps the eye opening defined by the noise-free samples of the signal of interest and determines the transition points (i.e., edges) of the eye opening. Those transition points are compared to the Unit Interval to yield NC-DDJ. Further, the signal-to-noise ratio (SNR) of the noisy samples of the signal of interest is compared to the SNR of an ideal receiver (i.e., matched filter) driven by an ideal transmitter via an ideal channel with additive white Gaussian noise n(t) to yield Enhanced TWDP.

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