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Keysight EXG and MXG X-Series Signal Generators User’s Guide
Basic Digital Operation (Option 653/655/656/657)
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
.
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
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
)
