Modulation Measurement Panel: General

Measurement File:

Browse and save the measurement file in a folder using

. If empty, IQSTAR pops up a browser at the end of the measurement in order to save the data

Note: 'Append' feature allows to add new measurement data at the end of an existing file

Note: Click on

, is it possible to choose output file format : "Measurement Files (*.imx)", "Unencryped Measurement Files (*.im)", "MDIF Files (*.mdf)", "CITI Files (*.cti)" or "CSV Files (*.csv)".

Note: Each extension setting can be defined using

:

for *.im or *.imx files, the interface is the following : IM Export
for *.csv files, check CSV Export
for *.mdf files, check MDIF Export

Information:

These information fields will be used by the visualisation and analysis tools in order to filter, sort data or to provide labels, titles or legends. The information entered here is saved in the header of the output file. To learn more see IQSTAR Measurement Files

DC Control:

'DUT reference plane' allows to optimize the DC value at the DUT reference plane through an optimization

DC Measurement:

This section is used to define the DC components to be measured. This feature is useful to reduce the measurement time. Each IV measurement devices will appear in the lists, allowing to choose if the voltage, the current, both or none should be measured during the sweeps. If unchecked, the value measured from the DUT biasing will be used and written in the file to replace the empty slots.

Note: For example, the DUT is biased with Vgate = -3V and Igate = 10uA, Vdrain = 30V and Idrain = 150mA. Only the drain voltage and current needs to be monitored so only Vdrain, Idrain are checked. In the output file, all the Vgate will equal to -3V, all Igate to 10uA but Vdrain and Idrain will be measured at each sweep point.

Thermal measurement

This section is used to define the thermal measurements in parallel to the RF measurements. If some of the sensors are checked, the temperature values will be saved for each measurement point, allowing the visualization of the temperature during the sweeps.

Stop Condition:

Select one or more conditions to stop a power sweep and switch to another:

Current maximum: using set the current limit not to exceed
Note: It is also possible to create an expression in order to define a custom figure of merit (e.g. sum of two currents).
Pout max: set the limit of output power of the DUT
PAPR Compression: using set the limit in PAPR compression if the reference is the maximum PAPR or the linear PAPR (it's also possible to average the linear part by setting point count) and finally set the level in dB
Note: In the general panel of modulated measurements, there is one more stop condition based on the Peak to Average Power Ratio (PAPR) compression. Indeed, as the main receivers (Power Meter) are wideband, the basic gain compression stop conditions will work on the average power. In order to base the stop condition on the peak power, it's advise to add a stop condition on the PAPR compression. To get access to this feature, the CCDF measurement should be enabled.
Gain compression: using set the limit in gain compression (Transducer or Power gain) if the reference is the maximum gain or the linear part (it's also possible to average the linear part by setting point count) and finally set the level in dB

Post actions

RF Stress: RF & IV states keep ON at the end of a sweep: used to keep the RF and IV on after the end of a sweep, allowing the DUT to stay biased and under stimulus.
Note: This option can be used to stress the DUT and see how the performances are affected in time. By shutting down the bench, the RF and IV will be automatically forced off.

Viewers

Allows to define a specific Real time viewer profile when new measurement is started. (useful during a Sweep Plan).