Rohde & Schwarz R&S SMB100B - Page 191

Reference oscillator
R&S
®
SMB100B
191User Manual 1178.3711.02 ─ 08
Sharing the 1 GHz reference frequency to obtain phase-coherent signals
Compared to 10 MHz, a 1 GHz reference signal significantly improves the achievable
phase stability between two signal sources. Because the synchronization frequency
increases by a factor of 100, the relative phase fluctuations between the sources can
be reduced.
1 GHz at connector Ref In 1GHz and 1 GHz at Ref Out 1GHz
●
External f
Ref
= 1 GHz
●
Source = "External"
●
External Reference Frequency = "1 GHz"
●
1GHz Reference Output = "1 GHz"
Using external reference source
If you have a clean external reference signal with 10 MHz or 100 MHz frequency, for
example, you can directly pass it to the output. The signal quality remains the same.
10 MHz, 100 MHz at connector Ref Out and Ref In
●
External f
Ref
= 10 MHz or 100 MHz
(earlier RF hardware versions: 5 MHz, 10 MHz, 13 MHz)
●
Source = "External"
●
Reference Output = "10 MHz, 100 MHz" or "Input Signal (loop through)"
(earlier RF hardware versions: 5 MHz, 10 MHz, 13 MHz)
●
Set the synchronization bandwidth according to the requirements of the applica-
tion.
Figure 8-2: Synchronizing instruments with a 10 MHz external reference signal
Ref. Frequency Source = e.g., Rohde & Schwarz signal analyzer
f
Ref
= 10 MHz, 100 MHz, 1 MHz to 100 MHz external reference frequency
Ref In, Ref Out = Connectors
You can forward reference frequency between 1 MHz and 100 MHz directly to the out-
put in the same way.
Note: R&S SMB100B can forward only a defined range of external reference frequen-
cies, see data sheet.
●
External f
Ref
= 1 MHz to 100 MHz
(1 MHz to 100 MHz at connector Ref In and Ref Out)
●
Source = "External"
●
Variable Reference Frequency = "Variable"
●
External Reference Frequency = current external frequency
Using the reference frequency for instruments synchronization