Keysight EXG and MXG X-Series Signal Generators User’s Guide 213
Basic Digital Operation for N5172B/82B with Options 653/655/656/657
Using I/Q Modulation
Configuring the Front Panel I and Q Input Connectors
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 156.
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 are calibrated
when the
I/Q Correction Optimized Path is set to
Ext I/Q Output (see page212)
Note: when the optimized path is set to RF, only the
RF Out path is calibrated.
Signal generator display: both RF paths are calibrated
when the
I/Q Correction Optimized Path is set to
RF Output (see page212)
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