Keysight M8121A Arbitrary Waveform Generator User Guide
69
Digital Up-Conversion
5
Digital Up-Conversion Modes
In these modes (see Option -DUC), IQ sample pairs provided by the sample
data source are interpolated to the selected sample rate and are fed to the
IQ modulator. The result is sent to the DAC. The benefit is that there are no
distortions caused by an external analog IQ modulator.
IQ Modulation
The instrument is able to provide an IQ modulated signal at its output,
which is based on the IQ data provided by the customer, the selected
interpolation mode, the carrier frequency and amplitude multiplication
factor.
Interpolated Modes
The instrument provides interpolation filters that allow an interpolation by
x3, x12, x24 and x48.
The available signal bandwidth of each interpolation filter is 0.8 x F
s
where
F
s
is the input I/Q sample rate. F
s
multiplied with the interpolation factor
leads to the DAC sampling rate.
The following table shows examples for the maximum DAC sample rate of
7200 MSa/s:
Table 5
Mode dependent modulation bandwidth
Markers in Interpolated Modes
Markers can be provided for each incoming IQ sample pair. It is not
possible to perform marking of interpolated sample values.
Interpolation Mode
Max. Input Sample Rate
Max. Modulation Bandwidth
INT_x3
2400 MSa/s
1920 MHz
INT_x12
600 MSa/s
480 MHz
INT_x24
300 MSa/s
240 MHz
INT_x48
150 MSa/s
120 MHz
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