Share a 1 GHz reference to obtain phase-coherent signals

Phase stability over time is a key characteristic for phase-coherent signals. A common 1 GHz reference signal maintains high phase stability between the RF outputs of multiple R&S®SGT100A SGMA vector RF sources.

Your task

Phase-coherent signals are required for device testing in many applications in various industries. Multiple test signals involve a number of signal sources which need to be synchronized. A key characteristic of such a phase-coherent system is its phase stability. Sharing a common local oscillator (LO) signal is the method of choice to achieve excellent phase stability of multiple signal sources up to the microwave frequency range. However, most signal sources do not provide a standard LO interface and therefore require additional hardware and software expenditures. On the other hand, all signal generators typically offer a standard 10 MHz reference input and output for synchronization purposes.

Such a 10 MHz reference oscillator signal can also be shared between different signal generators. But in most cases, the achievable phase stability is insufficient for phase-coherent applications.

T&M solution

1 GHz versus 10 MHz reference coupling

The compact R&S®SGT100A SGMA vector RF source from Rohde&Schwarz provides not only a 10 MHz reference, but also an additional 1 GHz reference as standard. Compared to 10 MHz, a 1 GHz reference signal significantly improves the achievable phase stability between two signal sources. Because the synchronization increases by a factor of 100, the relative phase fluctuations between the sources can be reduced.

1 GHz reference versus LO coupling

The achievable results when using a 1 GHz reference are close to the excellent phase stability achievable with LO coupling, especially for short-term measurements.

Since the 1 GHz reference is available as standard, it is a cost-efficient alternative for selected applications that require phase-coherent signals. Particularly at lower RF frequencies since the phase stability performance improves with lower RF outputs. The resulting phase stability at 500 MHz, for example, is excellent

Reference coupling is also required for phase-coherent systems with different RF output frequencies since LO coupled systems only support identical RF frequencies. The 1 GHz reference of the R&S®SGT100A makes it possible to achieve excellent phase stability for such applications where phase-coherence with different RF frequencies is required.

The R&S®SGT100A is a compact and cost-efficient solution for phase-coherent systems up to 6 GHz..

Coupling Input/output Remark
10 MHz REF in/out standard
13 MHz REF
in standard
100 MHz REF in standard
1 GHz REF in/out standard
LO in/out optional

Relative phase over time at 500 MHz RF output and constant temperature

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