Hardkey and Softkey Reference ESG Family Signal Generators
I/Q
4-46 User’s Guide
I Offset
Press this softkey to enter an origin offset voltage for
internally-generated or externally-applied in-phase signals. Enter the
value as a percentage of full scale (500 mV). The range of values
allowed is
−
100% to +100%. Change the origin offset to adjust out
imperfections in the in-phase signal or to introduce calibrated
impairments. Set the origin offset as desired and then toggle the
I/Q Adjustments Off On softkey to On.
When using this key to minimize the LO feedthrough signal, optimum
performance is achieved when the adjustment is made after all other
I/Q path adjustments, such as those made with the [Int Phase Polarity
Normal Invert] or [Modulator Atten xx db Manual Auto] softkeys. If
other adjustments are made after minimization is performed, the LO
feedthrough signal may increase.
Default Value: 0.0%
Softkey Location:
I/Q > I/Q Adjustments > I Offset
I/Q Adjustments
Pressing this softkey reveals a menu of I/Q adjustment choices for
internally generated or externally applied I and Q signals. In this menu
you can change the I to Q gain ratio, change the I and Q offset voltages,
change quadrature skew, and turn on and off these I/Q adjustments.
Default Value: Off
Softkey Location:
I/Q > I/Q Adjustments
I/Q Adjustments Off On
Press this softkey to toggle off and on the I to Q gain ratio and the I and
Q offset voltage adjustments. The values entered for the
I/Q Gain, I Offset,
and
Q Offset are not applied to the I and Q signals until the
I/Q Adjustments Off On softkey is set to On.
Default Value: Off
Softkey Location:
I/Q > I/Q Adjustments > I/Q Adjustments Off On
I/Q Calibration
Pressing this softkey reveals a menu of choices for executing an I/Q
calibration. An I/Q calibration should be performed approximately
every 30 days, but it can be performed at any time to peak the
performance of the I/Q modulator. You can set the start and stop
frequency for a user-defined I/Q calibration, or choose an I/Q calibration
over the signal generator’s entire frequency range. In this menu, you
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