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64 Agilent N5181A/82A MXG Signal Generators User’s Guide

Basic Digital Operation—No BBG Option Installed

I/Q Modulation

The following factors contribute to the error vector magnitude:

• Differences in amplitude, phase, and delay between the I and Q channels

•DC offsets

The I/Q menu provides adjustments to compensate for some of the differences in the I and Q signals

or to add impairments.

See also, “Modulating the Carrier Signal” on page 34.

Figure 7-1 I/Q Display and Softkeys

The following table shows common uses for the adjustments.

Table 7-1 I/Q Adjustments Uses

I/Q Adjustment Effect Impairment

Offset Carrier Feedthrough dc offset

Quadrature Angle

EVM error phase skew

I/Q Images I/Q path delay

This panel displays the external

I/Q signal routing.

This panel displays the current status and settings

of the I/Q adjustments. Grey indicates I/Q

adjustments are off.

or details on each key, use key help

s described on page 23.

Offsets the phase of the Q signal relative to the phase of the

I signal. The quadrature adjustment key is calibrated in units

of degrees. This adjustment is not calibrated.

Sets the dc offset

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