User`s guide

3-144 Agilent E6432A Microwave Synthesizer User’s Guide
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I/Q Calibration (Option UNG Only)
IGain
I Gain is used to enter compensation values for external source
impairments from the I signal path. Since it is the ratio of I Gain to
Q Gain that is important, it is usually only necessary to make
adjustments to I Gain or Q Gain, but not both.
QGain
Q Gain is used to enter compensation values for external source
impairments from the Q signal path. Since it is the ratio of I Gain to
Q Gain that is important, it is usually only necessary to make
adjustments to I Gain or Q Gain, but not both.
I Offset
I Offset is used to enter an origin offset voltage for the in-phase portion
of an I/Q signal. The value of I Offset is used to adjust out
imperfections in the in-phase signal.
The level of dc offset determines the level of carrier feed-through.
Q Offset
Q Offset is used to enter an origin offset voltage for the
quadrature-phase portion of an I/Q signal. The value of Q Offset is
used to adjust out imperfections in the quadrature-phase signal.
The level of dc offset determines the level of carrier feed-through.
Quadrature (Offset)
Quadrature (Offset) is used to adjust the phase angle between the I and
Q local oscillator signals.
To Check the Level of the Carrier Feed-Through
1. Set the I/Q Input to Test Tone.
2. Observe the level of the signal on a spectrum analyzer.
3. Remove the input signal if present.
4. Set the I/Q Input to Normal.
The amplitude difference should be at least as good as the level
specified by Origin Offset. (For complete specifications, refer to
“Specifications and Characteristics” on page 6-1.)
When the Quadrature is… The phase angle is…
Zero 90 degrees
Positive increases the angle from 90 degrees
Negative decreases the angle from 90 degrees