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Power Statistics CCDF

Measurement setup parameters:

• Set a reference trace, compare to

Gaussian noise trace

CCDF is generally measured with data

that is as random as possible in order

to match the Gaussian Curve. The

waveform CCDF provides the statistics

on the input signal analyzed over 1

second asynchronous to any feature

of the signal. 100 MHz samples are

histogrammed in real-time so we have

the statistics on 100 million samples.

The P-Series power meter provides

the waveform CCDF measurement in

graphical and table format (See Figure

14 and 15). Preamble and Header

portion of the waveform are ﬁ xed data,

thus causing the yellow line curve

on the CCDF plot to extend past the

Gaussian Curve and therefore display-

ing a very high PAR (See Figure 14).

Referring to Figure 16 and 17, the

Signal Studio under Waveform Setup

reveals that the CCDF plot and the

table to the left of the CCDF plot,

displays the calculated peak-to-aver-

age values. The blue line represents

the Gaussian noise and the yellow line

represents the input signal. Click the

Waveform CCDF or Burst CCDF button

to toggle between the calculation

types.

Instructions Keystrokes

On the P-Series:

1. Set the acquisition to “Free Run” [Trig/Acq], {Acqn A}, {Free Run}.

2. Measure the CCDF in trace format [Disp], {Disp Type}, {1 of 2}, {CCDF

Trace}.

3. Set the trace scale to 20 dB {Trace Control}, {Scale/Div 2dB}.

4. Setting up the Gaussian noise and

expand the display (See Figure 14) {Trace Display}, {Gaussian}, [

5. Set the CCDF in table format and

expand the display (See Figure 15)

[Disp], {Disp Type}, {1 of 2}, {CCDF

Table}, [ ].

Figure 14 CCDF graphical format. The yellow line is the

input signal. The blue reference line is the band-limited

Guassian noise curve. Marker 1 and Marker 2 indicate 10%

and 1% of time at speciﬁ ed power measurement.

Figure 15 CCDF table format

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 25 26

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