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Power Added Efficiency, Time Domain: PAE_TD


PAE_TD computes Power Added Efficiency (PAE) and plots it against a swept parameter. By default the average PAE is plotted against average input power.

PAE is the ratio of the power added by the DUT (output power less the input power) to the DC power, expressed in percent:

POut and PInp are the DUT output and input powers, respectively, and are obtained from the measured and reference signals of the Vector Signal Analyzer block VSA or the Vector Network Analyzer block VNA.

PDC is the DC power, which is obtained directly from the DC Power test point. This signal measured by the test point must be power in Watts, and is typically obtained from the optional DC source power output parameter of select blocks such as the Nonlinear Behavioral Model (Simulation-Based) block NL_S.


Name Type Range
Block Diagram System Diagram N/A
VNA/VSA System VNA meter, System VSA meter N/A
DC Power Test Point System Meter N/A
Output Bandcenter Real value Frequency band of measured signal
Output Bandwidth Real value Varies
Input Bandcenter Real value Frequency band of measured signal
Input Bandwidth Real value Varies
*Input fc (x-axis) Real value Frequency band of reference signal
*Input BW Real value Varies
Frequency Handling List of options N/A
RBW / # FFT Bins Real value >0
VBW / # Avg. Real value >0
*Overlap Ratio for Averaging Real value <=1
*FFT Windowing Type List of options N/A
*FFT Windowing Parameter Real value Varies
*Meas. Filter List of options N/A
*Alpha Real value Depends on Meas. Filter
*Start Offset Real value >= 0
*Signal Delay List of options N/A

* indicates a secondary parameter

NOTE: If the selected system diagram is configured for a swept simulation, the measurement will have additional parameters for specifying the plotting configuration for each swept parameter. These parameters are dynamic and change based upon which data source is selected. See Section 1.3.3 in the VSS Modeling Guide for details.


This measurement returns the average PAE for each sweep. By default the values are plotted as a function of swept input channel power.

Right-clicking the cursor on the measurement in a graph displays the settings used to compute the result at the selected data point.

Graph Type

This measurement can be displayed on a rectangular graph or tabular grid.

Computational Details

This measurement computes the input and output power values similar to the Power Meter measurement PWR_MTR. The DC power value is read directly from the DC Power test point, and is treated as power in Watts. The DC power samples are averaged over the same time period used to compute the input and output power values. This time period is dependent upon the number of FFT bins and the number of averages used to compute those power values.

If a measurement filter is selected through Meas. Filter, the filter is applied to the input and output power values used in the PAE computation, but not to the DC power value, nor to the input power assigned to the x-axis.

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