I/Q software interface (Option R&S RTP-K11)
R&S
®
RTP
1007User Manual 1337.9952.02 ─ 12
– The complex IF format requires an output sample rate of >250 Msample/s if
input sample rate is 20 Gsample/s.
– The input signal is down-converted, filtered and resampled to the sample rate
of the output I/Q signal.
– Two input channels are required for each input signal, one for the in-phase
component, and one for the quadrature component. Thus up to two complex
input signals can be recorded in parallel.
– Sideband settings: see "Sideband (complex IF input)" on page 1008.
Remote command:
CHANnel<m>:IQ:INPType on page 2250
CHANnel<m>:IQ:INPMode on page 2251
Rel. BW, Filter BW
"Rel. BW" sets the bandwidth factor to define the filter bandwidth:
Filter BW = Relative BW * Sample rate
Remote command:
IQ:RBWidth on page 2251
IQ:BWIDth? on page 2251
Sample rate
Sets the required sample rate of the output I/Q data.
The range depends on the input sample rate. For an input sample rate of
20 Gsample/s, the range of the output sample rate is 1 ksample/s to 20 Gsample/s. For
an input sample rate of 40 Gsample/s, the range of the output sample rate is
400 Msample/s to 40 Gsample/s. See also: "Input sample rate" on page 1005.
Remote command:
IQ:SRATe on page 2252
Record length
Sets the required record length of the output I/Q data. The resulting acquisition time of
the I/Q data is:
Acquisition time = Record length / Sample rate
R&S RTP044, R&S RTP064, R&S RTP084:
The maximum record length of 40 Msample is available if the output sample rate is
≤250 Msample/s or >400 Msample/s. In the range between these values, the record
length depends on the sample rate and increases linearly from 25 Msample to
40 Msample.
R&S RTP134, R&S RTP164:
The maximum record length of 80 Msample is available if the output sample rate is
>800 Msample/s. At the minimum output sample rate of 400 Msample/s, the maximum
record length is 40 MSa. In the range between 400 Msample/s and 800 Msample/s, the
maximum record length is Max record length = Sample rate / 10.
Remote command:
IQ:RLENgth on page 2252
I/Q sampling setup
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