R&S FSL TRACe Subsystem
1300.2519.12 6.267 E-11
Further information
– Sample rate and maximum usable bandwidth
Sample rate and maximum usable bandwidth
Within the usable bandwidth range, the analog IF filter of the R&S FSL is equalized in regard to
a
mplitude characteristic and group delay (provided that the R&S FSL is aligned; for details see chapter
4, section "Instrument Setup and Interface Configuration – SETUP Key", "Alignment"). In consequence,
signals within this bandwidth range are hardly distorted at all (provided the R&S FSL is not overloaded).
For the I/Q data acquisition, digital decimation filters are used internally. The passband of these digital
filters corresponds to the maximum usable bandwidth. In consequence, signals within the usable
bandwidth (passband) remain unchanged, while signals outside the usable bandwidth (passband) are
suppressed. Usually, the suppressed signals are noise, artifacts, and the second IF side band. If
frequencies of interest to you are also suppressed, you should try to increase the output sample rate,
since this increases the maximum usable IQ bandwidth.
As a rule, the usable bandwidth is proportional to the output sample rate (see section Instrument
models with UDC motherboard or Instrument models with WDDC motherboard). Yet, when the I/Q
bandwidth reaches the bandwidth of the analog IF filter (at very high output sample rates), the curve
breaks. For the base unit, the sample rate ranges from 10 kHz to
MHz365.8 .
The maximum usable bandwidth is listed in the data sheet. The value differs between the instrument
models due to different motherboards:
• UDC motherboard (order # 2112.1800)
• WDDC motherboard (order # 1300.3080)
If you are not sure which motherboard your model has, check the
Hardware Information list (SETUP
key – More –
System Info – Hardware Info; for details see chapter 4).
Instrument models with UDC motherboard
The following diagram shows the maximum usable IQ bandwidths depending on the output sample
rates. The values are rounded off to two decimal places.
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