Rohde & Schwarz SMBV100B - How to Improve Signal Characteristics by Shifting the Wanted Baseband Signal

Configuring the Internal Baseband Source
R&S
®
SMBV100B
253User Manual 1178.4460.02 ─ 03
The block diagram shows an icon Δf on the signal path to indicate an applied fre-
quency offset.
Settings:
Frequency Offset.........................................................................................................253
Phase Offset................................................................................................................253
Frequency Offset
Enters the frequency offset for the internal or external baseband signal and shifts the
useful baseband signal in the center frequency.
Use function, for example, to shift the baseband signal relative to the AWGN signal.
See:
●
Chapter 3.10.1.1, "Impact of the Frequency Offset", on page 250 for detailed infor-
mation on the calculation of the frequency offset value range
●
Chapter 3.10.3, "How to Improve Signal Characteristics by Shifting the Wanted
Baseband Signal", on page 253
Remote command:
[:SOURce<hw>]:BB:FOFFset on page 710
[:SOURce<hw>]:BBIN:FOFFset on page 710
Phase Offset
Enters the phase offset for the baseband signal (see Chapter 3.10.1.2, "Impact of the
Phase Offset", on page 252)
The phase offset affects the signal on the "Baseband block" output.
Use this parameter, for example, to change the start phase of the baseband signal.
Remote command:
[:SOURce<hw>]:BB:POFFset on page 710
[:SOURce<hw>]:BBIN:POFFset on page 710
3.10.3 How to Improve Signal Characteristics by Shifting the Wanted
Baseband Signal
Shifting of the generated baseband signal is useful in the following cases:
●
You analyze the generated signal with a signal analyzer and the displayed signal
spectrum indicates a carrier leakage (a signal drop) at the current RF frequency.
Shifting and Boosting the Baseband Signal