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Keysight EXG and MXG X-Series Signal Generators User’s Guide
Digital Signal Interface Module (Option 003/004)
Operating the N5102A Module in Input Mode
From this menu, select how the binary values are represented. Selecting 2’s complement
allows both positive and negative data values. Use the Offset Binary selection when
components cannot process negative values.
5.
Select the numeric format required for the test.
6.
Press the
More (1 of 2)
softkey.
From this softkey menu, select the bit order, swap I and Q, the polarity of the data, and access
menus that provides data negation, scaling, and filtering parameters.
7.
Press the
Data Negation
softkey.
Negation differs from changing the I and Q polarity. Applied to a sample, negation changes the
affected sample by expressing it in the two's complement form, multiplying it by negative one,
and converting the sample back to the selected numeric format. This can be done for I
samples, Q samples, or both.
The choice to use negation is dependent on the device being tested.
8.
To access I/Q scaling and filter parameters, press
Return
>
N5102A Off On
to On. This will
invoke the real time Custom format in the signal generator’s baseband generator. This is
needed to set the filter parameters when Pre-FIR Samples is selected as the data type.
9.
Press the
Baseband Setup
softkey.
Use this softkey menu to adjust the I/Q scaling and access filter parameters. If the selected
data type is Samples, the
Filter
softkey is grayed out (inactive). For more information on
user-defined filtering, refer to the
“Using Finite Impulse Response (FIR) Filters in the Dual ARB
Real-Time Modulation Filter” on page 254
and
“Modifying a FIR Filter Using the FIR Table
Digital Data
If the N5102A digital module is not on, press
Return
>
Return
>
N5102A Off On to On
.
Digital data is now being transferred through the N5102A module to the signal generator. The
green status light should be blinking. This indicates that the data lines are active. If the status light
is solidly illuminated (not blinking), all the data lines are inactive. The status light comes on and
stays on (blinking or solid) after the first time the N5102A module is turned on (
N5102A Off On
to
On). The status light will stay on until the module is disconnected from its power supply.
If changes are made to the baseband data parameters, it is recommended
that you first disable the digital input (
N5102A Off On
softkey to Off) to
avoid exposing the device and the N5102A module to the signal variations
that may occur during the parameter changes.
