Agilent X-Series Signal Generators SCPI Command Reference 33
Basic Function Commands
Digital Modulation Subsystem—N5172B/82B ([:SOURce])
Range ï€100 to 100 mV
Key Entry External Input Q Offset
Remarks This command is effective only if the state of the I/Q adjustment function is set to
ON. Refer to the :DM:IQADjustment[:STATe] command.
:DM:IQADjustment:EXTernal:QSKew
Supported N5172B/82B
[:SOURce]:DM:IQADjustment:EXTernal:QSKew <value>
[:SOURce]:DM:IQADjustment:EXTernal:QSKew?
CAUTION This Q phase angle adjustment is uncalibrated.
This command adjusts the phase angle (quadrature skew) between the I and Q vectors by increasing
or decreasing the Q phase angle. This command adjusts the signals externally input to the signal
generator’s front- panel Q input connector. For more information on this connector, refer to the User’s
Guide.
The <value> variable is expressed in degrees with a minimum resolution of 0.1.
If the signal generator is operating at frequencies greater than 3.3 GHz, quadrature skew settings
greater than ±5 degrees will not be within specifications.
Positive skew increases the angle from 90 degrees while negative skew decreases the angle from
90 degrees. When the quadrature skew is zero, the phase angle between the I and Q vectors is 90
degrees.
This command is effective only if the state of the I/Q adjustment function is set to ON. Refer to the
:DM:IQADjustment[:STATe] command.
Example
:DM:IQAD:EXT:QSK 4.5
The preceding example increases the phase angle by 4.5 degrees.
*RST +0.00000000E+000
Range ï€200 to +200
Key Entry Quadrature Angle Adjustment
:DM:IQADjustment:GAIN
Supported N5172B/82B
[:SOURce]:DM:IQADjustment:GAIN <value><unit>
[:SOURce]:DM:IQADjustment:GAIN?
This command adjusts the ratio of I to Q while preserving the composite, vector magnitude. Adding
gain (+x dB) to the signal increases the I component and decreases the Q component proportionally.
Reducing gain (–x dB) decreases the I component and increases the Q component proportionally.
The variable <value> is expressed in units of decibels (dB).
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