Scalar Calibration using S-parameters files

Application

Used to correct the power meter measurement to the DUT reference plane. The aim of this calibration is to determine, without S-parameters pre-characterization, the offset factor to apply on each power meter to get calibrated measurements.

This Calibration process will help to calibrate the input and output ports when wideband modulated signal measurements are required:

1-Tone Measurements (Pin Available, Pout, Gt, Drain Efficiency, Transducer Efficiency)
2-Tones Measurements and Video Bandwidth (VBW) Measurements (Pin Available, Pout, Gt, Drain Efficiency, Transducer Efficiency, C/In, OIPn, ….)
Modulation Measurements (Pin Available, Pout, Gt, Drain Efficiency, Transducer Efficiency, ACPR, PAPR, CCDF, ...)
I/Q Measurements (Pin Available, Pout, Gt, Drain Efficiency, Transducer Efficiency, ACPR, PAPR, CCDF, ...)

Note: Vector Signal Analyzer is not mandatory for the calibration, but should be enabled for 2-Tones Measurements, Video Bandwidth (VBW) Measurements, Modulation Measurements and I/Q Measurements .

Setup Editor Requirement

The IQSTAR calibration wizard is linked to the Setup Editor configuration. In order to get access to the Scalar Power calibration wizard, the following conditions have to be respected:

A minimum of two Power Meter instruments (input and output) need to be enabled
One RF Source instrument need to be enabled

Calibration Wizard

To start a new calibration, select the Calibrations tab and click on New Calibration. The software will propose to choose between two Scalar Calibration:

Then select "S-parameters files".

Define the frequency list to use during the calibration.

Then fill the "direct" and "coupled" s-parameters files, needed to describe frequency-wise the input path.

Note: If the frequencies defined in the calibration frequency list are not included in the s-parameter file, these will be automatically interpolated.

In case of refected Power Meter used, fill "reflected" s-parameters file needed to describe refected path.

Finally, fill the "output' s-parameters file to descrided output path.

Once the calibration is finished, the error terms are downloaded and recorded in the Calibrations tab. A comment is automatically added but can be modified. This calibration will be used by default for the measurement unless the box ‘Use this calibration’ is unchecked.

Quick checks can be performed to verify the accuracy of this calibration using Validate calibration. To learn more see Validate Calibration.

Note: Contrary to the Scalar Calibration, in Scalar Calibration using S-parameters files the Raw Power Calibration won't be performed automatically.