On 11/15/2017 08:27 PM, Rohit Kulkarni via USRP-users wrote:
Hi,
I am working on USRP N210 with a WBX (Revision 2) daughterboard. The
WBX daughterboard uses ADF 4350 to generate a frequency signal which
feeds into the mixer in the RX chain.
We want to have a control over the frequency signal generated by ADF
4350 (this is a differential signal available on pins RFOut A+/-) and
hence we have erased the connection between CPout pin to Vtune pin and
feed a constant (or varying) voltage signal to Vtune pin. (This signal
is generated externally through say a voltage power supply). We then
run uhd_fft -f <some frequency> to set up the default register values
within ADF 4350 and try to feed a voltage signal of constant or
varying magnitude between 0.5V to 2.4V.
When we monitor the frequency signal coming out of RFOutA+/- we see
that it's a constant frequency signal which varies only when we run
uhd_fft with a different frequency setting. Frequency signal does not
vary as we sweep our voltage signal (feeding to Vtune) from 0.5V to 2.4V.
Assuming that all the connections are proper and we are feeding a
valid voltage signal to Vtune, can someone tell me what might be going
wrong possibly in our setup?
For your reference, this is the schematic of the WBX daughterboard
(check page 3) - https://files.ettus.com/schematics/wbx/WBX.pdf
Datasheet of ADF 4350 -
http://www.analog.com/media/en/technical-documentation/data-sheets/ADF4350.pdf
Thanks,
Rohit
So, I'm going to go ahead and ask WHY you want to do this?
If the purpose is just to "experiment with the ADF4350" there are
relatively-cheap evaluation boards available for it.
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