122 Agilent N5181A/82A MXG Signal Generators User’s Guide
Basic Digital Operation (Option 651/652/654)
I/Q Modulation
Using the Rear Panel I and Q Outputs
NOTE The 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 and
Q signals to the rear panel I and Q connectors. These output signals are post DAC, so they are in
analog 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 generator
The factory default setting routes the internally generated I and Q signals to the I/Q modulator and
the rear panel I and Q output connectors. However to optimize (apply calibration factors) the rear
panel signals, you need to select the external I/Q output path.
Select and Play a Waveform
1. Press Mode > Dual ARB > Select Waveform.
2. Highlight the desired waveform.
3. Press Select Waveform > ARB Off On to On.
Optimize the Signal Path
1. Connect cables from the rear panel I and Q connectors to either a DUT or another signal
generator.
When you turn the ARB on, the signal generator automatically outputs the I and Q signals to the
rear panel connectors.
You can use the rear panel I and Q signals as I and Q inputs to another signal 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.
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