[USRP-users] Crest factor for A/D

Sivan Toledo stoledo at tau.ac.il
Thu Feb 28 14:51:47 EST 2013


Seems like a generally useful feature.


On Thu, Feb 28, 2013 at 12:39 PM, Matt Ettus <matt at ettus.com> wrote:

>
> David,
>
> One way to know if you are getting overload is to look for samples that
> are at the max 14-bit 2's comp size, so +8191/-8192.  This would need to be
> done in the FPGA ahead of any of the other DSP.  You could create a block
> which just watches the stream, and reports back if/when you hit the max
> amplitudes.  This could come back as context packets.
>
> Matt
>
>
> On Tue, Feb 26, 2013 at 12:57 PM, David Campbell <david at davidcampbell.us>wrote:
>
>> Hi,
>>     I am wondering if there is a way to retrieve in realtime A/D loading
>> data (i.e. crest factor) for the N210 et.al (so the RX path).   This
>> would be the loading of the 100 Msps A/D, before it goes into to the
>> tuners.  Otherwise, I may not be able to tell if my input is overloading
>> the A/D.
>> Thanks,
>> David
>>
>>
>>
>>
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>>
>>
>
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