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Demonstrations
Demo #3 – Complex Cal: Improving EVM in a 128 QAM Signal
Compatible Signal Generators:
— N5166B (CXG)
— N517xB (all EXG)
— N518xB (all MXG)
— N519xA (all UXG)
— M9x84B/C (all VXG)
This demonstration shows how to perform a complex calibration on a QAM signal, correcting for
both absolute power accuracy and Error Vector Magnitude (EVM). This will also demonstrate how
to add an additional calibration state to improve measurement flexibility, specifically for handling
multiple RF paths. Normally you would not make digital demodulation measurements through the
YTF preselected path; however, using the built-in YTF allows for an easy way to demonstrate using
RCal to correct for a bandpass filter's roll-off.
1. Preset the analyzer.
Mode > Spectrum Analyzer > Mode Preset
2. Connect the signal analyzer to the signal generator without an attenuator in between.
3. Configure the signal generator using the following settings:
FREQ > 5GHz
AMPTD > -10dBm
Mode > Arb Custom Modulation > Single Carrier Setup > Modulation Type > Select > QAM
> 128 QAM
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U9361C/F/G/M RCal Receiver Calibrator Measurement Guide
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