On 02/28/2018 03:32 PM, Brais Ares via USRP-users wrote:
Hello,
We are using a E310 device to capture a signal and further process it
in Matlab. We also have a frontend that lift the received signal
around 43 dB before going into the E310.
When we use direct RF to baseband conversion we observe a high DC
suppression, around 50 dB (see figure here <https://imgur.com/a/sLWyE>)
Is there any way to avoid it or the only option is to move this "hole"
by tuning the lo_offset in tune_request_t (then not using direct RF
conversion, but converting to IF first) further away from the signal
I'm interested in?
And out of curiosity, which would be the exact block of the rx chain
which is performing this DC suppression?
Regards,
Brais.
DC offset suppression is performed inside the AD9361.
If your signal is right at the notional centre frequency and is very
narrowband, you can get significant suppression of it. The way to deal
with this is
to use offset tuning.
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