N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

Basic Digital Operation (Option 651/652/654)I/Q ModulationUsing the Rear Panel I and Q OutputsNOTEThe rear panel I and Q connectors only output a signal while using the internal BBG.In addition to modulating the carrier, the signal generator also routes the internally generated I andQ signals to the rear panel I and Q connectors. These output signals are post DAC, so they are inanalog form. You can use these rear panel I and Q signals to:• drive a system’s transmitter stage• test individual analog I and Q components such as an I/Q modulator• route the I and Q signals into another signal generatorThe factory default setting routes the internally generated I and Q signals to the I/Q modulator andthe rear panel I and Q output connectors. However to optimize (apply calibration factors) the rearpanel signals, you need to select the external I/Q output path.Select and Play a Waveform1. Press Mode > Dual ARB > Select Waveform.2. Highlight the desired waveform.3. Press Select Waveform > ARB Off On to On.Optimize the Signal Path1. Connect cables from the rear panel I and Q connectors to either a DUT or another signalgenerator.When you turn the ARB on, the signal generator automatically outputs the I and Q signals to therear panel connectors. You can use the rear panel I and Q signals as I and Q inputs to anothersignal generator. The MXG has front panel connectors, I Input and Q Input, for this purpose.2. Press I/Q > I/Q Correction Optimized Path > Ext I/Q Output.When you optimize a path, the path indicator turns green.Factory default setting—RF Output path optimizedRear panel I/Q path optimizedAgilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide 199