N O T E
The Q-factor calculations are disabled and flagged as "not applicable" if the R
2
value
falls below 0.75.
The R
2
value can also be seen as an indicator of how well the noise
distribution fits to Gaussian shape. It will not fit, for example, if the
received signal is dominated by cross-talk or modal noise.
Eye Opening
Eye Opening - Concepts
The Eye Opening measurement generates a three-dimensional bit error
rate (BER) diagram as a function of the sample delay and the sample
threshold. With this measurement, the complete eye of the DUT output
signal is measured. The results comprise the voltage and timing of the
eye opening and the optimum sampling point.
To get the result, the sampling delay and the input threshold of the
signal are shifted within 1.5 signal periods and a user-defined voltage
range. The results comprise the voltage and timing of the eye opening
and the optimum sampling point.
An example, that illustrates the general principle of the Eye Opening
measurement is shown in the figure below.
5
Advanced Analysis
220
Agilent J-BERT N4903 High-Performance Serial BERT
Summary of Contents for J-BERT N4903
Page 1: ...S Agilent J BERT N4903 High Performance Serial BERT User Guide s Agilent Technologies...
Page 68: ...2 Setting up Patterns 68 Agilent J BERT N4903 High Performance Serial BERT...
Page 158: ...4 Setting up the Error Detector 158 Agilent J BERT N4903 High Performance Serial BERT...
Page 314: ...6 Evaluating Results 314 Agilent J BERT N4903 High Performance Serial BERT...
Page 374: ...7 Jitter Tolerance Tests 374 Agilent J BERT N4903 High Performance Serial BERT...
Page 394: ...8 Solving Problems 394 Agilent J BERT N4903 High Performance Serial BERT...
Page 434: ...Index 434 Agilent J BERT N4903 High Performance Serial BERT...
