Rohde & Schwarz R&S SGS100A - Local Oscillator (LO) Coupling

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Signal generator settings

R&S

SGS100A

93User Manual 1173.9105.02 ─ 13

The frequency offset value represents the frequency shift of a downstream instrument,

as, for example, an attenuator or an amplifier.

Enabled frequency offset does not change the frequency at the RF output (Frequency).

It influences the value of the parameter "SGMA-GUI main panel > Freq".

The following applies:

"Freq" = Frequency + "Offset"

In the "SGMA-GUI main panel", enabled frequency offset is also indicated with the key-

word "Freq (Offs)".

Remote command:

[:SOURce]:FREQuency:OFFSet on page 260

Delta Phase

Sets the phase of the RF signal. The current phase of the signal is used as the refer-

ence. This function allows, for example, the phase of the output signal to be synchron-

ized with the phase of a signal from a second signal generator.

Remote command:

[:SOURce]:PHASe on page 272

Reset Delta Phase Display

Resets delta phase value. The set phase is adopted as the new current phase, i.e. the

delta phase value is reset to 0.

Remote command:

[:SOURce]:PHASe:REFerence on page 272

9.3 Local oscillator (LO) coupling

The LO coupling function allows you to distribute the local oscillator signal. Distribute

the LO signal in a way that multiple R&S SGS instruments or other R&S signal genera-

tors can be driven by the same LO signal. Use the same LO signal for phase coherent

applications, e.g., the generation of beamformed signals and for phase coherent

demodulation.

The LO coupling function requires option R&S SGS-K90 (Phase Coherence). This

option enables phase coherent RF outputs of two or more RF signals. The local oscilla-

tor signal is provided at the "REF/LO OUT" connector. An external signal can be input

at the "REF/LO IN" connector.

Refer to Figure 7-9 for visualization of the signal flow.

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