User Manual

SIGLENT
SSG3000X User Manual 74
2.8 I/Q Modulation
I/Q modulation, i.e. two orthogonal signals (carriers with the same frequency, phase
difference of 90°, generally expressed by Sin and Cos) and I (In-Phase, in-phase
component) and Q (Quadrature Phase) signals are respectively modulated by carrier and
transmitted together, thereby improving spectrum utilization.
Note: Only some models are equipped with IQ modulation function. For specific models,
please refer to the SSG3000X data sheet.
2.8.1 Turning on I/Q modulation
The I/Q modulation setup menu can be accessed in one of three ways:
 Click the Power Meter button on the shortcut menu page.
 Click the I/Q modulation control on the home page.
 Press the I/Q button on the front panel.
On the I/Q modulation interface, click on the I/Q status to turn on I/Q modulation.
2.8.2 I/Q source
The I/Q modulation uses an external modulation source that receives the I/Q modulated
in-phase baseband signals and quadrature phase modulation signals input from the [I
INPUT] and [Q INPUT] connectors on the rear panel.
Note: The modulation function must be activated to modulate the output signal. You can
turn it on or off by pressing the MOD ON/OFF button or you can open it by checking the
MOD module on the home page.