124 Agilent N5181A/82A MXG Signal Generators User’s Guide
Basic Digital Operation (Option 651/652/654)
I/Q Modulation
Configuring the Front Panel Inputs
The signal generator accepts externally supplied analog I and Q signals through the front- panel I
Input and Q Input. You can use the external signals as the modulating source, or sum the external
signals with the internal baseband generator signals.
1. Connect I and Q signals to the front panel connectors.
a. Connect an analog I signal to the signal generator’s front- panel I Input.
b. Connect an analog Q signal to the signal generator’s front- panel Q Input.
2. Set the signal generator to recognize the front- panel input signals:
• To Modulate onto the Carrier
Press I/Q > I/Q Source > External.
• To Sum and Modulate onto the Carrier
Press I/Q > I/Q Source > Sum.
To select and play a waveform for the BB GEN path, see page 71.
Notice that only the internal BBG (BB GEN) routes I and Q signals to the rear- panel I and Q
outputs.
3. If you are using only the external I and Q signals (no summing), turn on the I/Q modulator:
Press I/Q Off On to On.
4. Configure the RF output:
a. Set the carrier frequency.
b. Set the carrier amplitude.
c. Turn the RF output on.
Signal generator display—both paths calibrated with
I/Q Correction Optimized Path set to Ext I/Q
Output (see
page 122).
Signal generator display—both RF paths calibrated
with I/Q Correction Optimized Path set to RF
Output (see
page 122).
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