RFSoC Development Kit Getting Started Guide
Page 26
8.
Select ‘500 Captures’ and press ‘Acquire’.
We shall now relax the DPD observation path attenuation in 10 dB steps, gradually increasing the signal
level at the RF-ADC while the acquisition is underway.
9.
Type ‘
c
’ at the terminal command line followed by a carriage return, then enter the value ‘
80
’ to
decrease the attenuation by 10 dB. Repeat with values ‘
40
’ and ‘
0
’. Observe the corresponding
increase in signal level, which should ultimately reach approximately -1.65 dBFS.
Finally we can relax the Channel 1 TX digital attenuator, which until now has remained at maximum
attenuation.
10.
Type ‘
a
’ at the terminal command line followed by a carriage return, then enter the value ‘
119
’ to
decrease the attenuation by 1.65 dB. The signal level should now be approximately 0 dBFS, full-scale.
Figure 21 - Channel 1 Tx Attenuator relaxed by 1.65 dB to reach 0 dBFS at observation ADC
Important: Increasing the signal strength through the DPD observation path
beyond this level may cause damage to the RF-ADC.
This completes experiment 1.
