Agilent Technologies E8257D PSG User Manual page 274

Peripheral Devices
N5102A Digital Signal Interface Module
6. Press the
More (1 of 2)
From this softkey menu, select the bit order, swap I and Q, select the polarity of the transmitted
data, and access menus that provide data negation, scaling, gain, offset, and IQ rotation
adjustments.
7. Press the
Data Negation
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 and how it needs to receive
the data.
8. Press the
Gain, Offset & Scaling
Use the softkeys in this menu for the following functions:
• reduce sample values for both I and Q using the
• increase or decrease the sample values independently for I and Q using the
softkeys
• compensate for or add a DC offset using the
• rotate the data on the IQ plane using the
9. Make any required scaling, gain, offset, or rotation adjustments to properly test the device.
10. Press >
Return Return
Configuring the Clock Signal
1. Refer to Figure 12-
Figure 12-13
260
softkey.
softkey.
softkey.
to return to the first- level softkey menu.
13. Press the
Clock Setup
Clock Setup Menu Location
softkey
Scaling
and
I Offset Q Offset
Rotation softkey
softkey.
and
I Gain
softkeys
Accesses the Clock Setup Menu
Q Gain
Chapter 12