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260 Chapter 12

Peripheral Devices

N5102A Digital Signal Interface Module

6. Press the More (1 of 2) softkey.

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 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 and how it needs to receive

the data.

8. Press the

Gain, Offset & Scaling softkey.

Use the softkeys in this menu for the following functions:

• reduce sample values for both I and Q using the

Scaling softkey

• increase or decrease the sample values independently for I and Q using the

I Gain and Q Gain

softkeys

• compensate for or add a DC offset using the

I Offset and Q Offset softkeys

• rotate the data on the IQ plane using the

Rotation softkey

9. Make any required scaling, gain, offset, or rotation adjustments to properly test the device.

10. Press

Return > Return to return to the first-level softkey menu.

Configuring the Clock Signal

1. Refer to Figure 12- 13. Press the

Clock Setup softkey.

Figure 12-13 Clock Setup Menu Location

Accesses the Clock Setup Menu

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Agilent Technologies E8257C PSG Guida Utente Pagina 274