Digital Up-Conversion Modes; Iq Modulation; Interpolated Modes; Markers In Interpolated Modes - Keysight M8121A User Manual

Digital Up-Conversion Modes

IQ Modulation

Interpolated Modes

Markers in Interpolated Modes

Keysight M8121A Arbitrary Waveform Generator User Guide
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.
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.
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
F is the input I/Q sample rate. F
s
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
Interpolation Mode
INT_x3
INT_x12
INT_x24
INT_x48
Markers can be provided for each incoming IQ sample pair. It is not
possible to perform marking of interpolated sample values.
multiplied with the interpolation factor
s
Max. Input Sample Rate
2400 MSa/s
600 MSa/s
300 MSa/s
150 MSa/s
Digital Up-Conversion
where
s
Max. Modulation Bandwidth
1920 MHz
480 MHz
240 MHz
120 MHz
5
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