Statistics - Ladybug PowerSensor+ LB480A Product Manual

Models LB480A/LB680A USB PowerSensor+™
Product Manual PPA (Pulse Profiling Application)

6. Statistics

Setup & Control
CDF
CCDF
PDF
The tab shown below provides a dockable window for the statisitical analysis of the signal trace. The tool allows for
three presentations from the Setup & Control dialog box: The CDF (Cumulative Distribution Function) display shows
the probability that a signal is below the average power level.
The CCDF (Complementary Cumulative Distribution Function) display shows how much time the signal spends at or
above the average power level. The power level is expressed in dB relative to the average power. The percentage of
time the signal spends at or above each line defines the probability for that particular power level. A CCDF curve is a
plot of relative power levels versus probability. The PDF (Probability Density Function) is shown above from our prior
demonstration with a specified input to the sensor. There is provision for entering the resolution; data source (trace or
gates); minimum and maximum power; and number of data sets or runs with counter.
NOTE: Power (CCDF) curves provide critical information about the signals encountered in 3G systems. These curves
also provide the peak-to-average power (crest factor) data needed by component designers.
Revision: 08/02/11
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