ESG Family Signal Generators Hardkey and Softkey Reference
I/Q
User’s Guide 4-47
can also restore the values for the I/Q calibration performed at the
factory (the instrument discards the latest calibration data and uses
the data installed by the factory).
Softkey Location:
I/Q > I/Q Calibration
I/Q Gain
Press this softkey to change the I to Q gain ratio. For example, if you
enter in a value of +1 dB, the I signal will have 1 dB more amplitude
than the Q signal. The range of gain adjustment values allowed is
−
4 dB to +4 dB. The gain ratio adjustment can be used with
externally-applied I and Q signals or with internally-generated I and Q
signals. Change the gain ratio to adjust out imperfections in I and Q or
to introduce calibrated impairments. Set the gain ratio as desired and
then toggle the
I/Q Adjustments Off On softkey to On.
Default Value: 0 dB
Softkey Location:
I/Q > I/Q Adjustments > I/Q Gain
I/Q Off On
This softkey enables the I/Q modulation. Notice, however, that although
you can enable I/Q modulation with this softkey, the RF carrier is
modulated only when you have also set
Mod On/Off to On. I/Q Off/On is also
toggled automatically to
On when any of the digital modulation formats
are enabled (Option UN8). However, you can turn off the I/Q
modulation with this softkey even though the digital modulation mode
is enabled. With this configuration, the RF output signal would not be
modulated but the I/Q signals will be present at the rear panel I/Q
outputs. Whenever I/Q modulation is enabled, the
I/Q annunciator is
turned on in the display.
Default Value: Off
Softkey Location:
I/Q > I/Q Off On
I/Q Source
Pressing this softkey reveals a menu of I/Q source choices. If you have
enabled a digital modulation format (Option UN8 only), the signal
generator is automatically set to internally generate I and Q signals
(
Int I/Q). You cannot use the internal source unless you have also enabled
a digital modulation format. You can externally supply the I and Q
signals via the I INPUT and Q INPUT connectors by pressing
Ext I/Q.
Apply the in-phase and quadrature-phase signals to the I and Q inputs.
The signal level is = 0.5 V
rms
. (See the sections on Ext I/Q and
High Crest Mode.)
Default Value: Ext I/Q
Softkey Location:
I/Q > I/Q Source
I
2
Q
2
+
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