[USRP-users] USRP N210 WBX Board | ADF 4350 VCO IC Not getting Configured

Rohit Kulkarni k.rohit.u at gmail.com
Thu Nov 16 02:27:07 EST 2017


I agree that it probably makes more sense to test this out on an eval
board. I'm considering getting one soon.

For now, can you guess what could be going wrong with the setup?

Thanks,
Rohit

On Wed, Nov 15, 2017 at 8:09 PM, Marcus D. Leech via USRP-users <
usrp-users at lists.ettus.com> wrote:

> 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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