Re: [Discuss-gnuradio] Arbitrary ADC resolution at the receiver

[Leonardo S. Cardoso]

Hi Marcus,

There are several reasons why we would like to avoid reducing the resolution in software: 1. Reduce receiver complexity; 2. Capture any artifact of the DDC with respect to the reduction of the resolution.

Frankly speaking, I'm not sure any of these arguments are defendable to impose a resolution control at the ADC or even the ADC-FPGA interface. If it isn't, then I agree it is much simple to do it in soft.

BR,

Leo

Leonardo S. Cardoso

address@hidden

On Mon, Jun 30, 2014 at 5:46 PM, Marcus Müller <address@hidden> wrote:

Just out of curiosity: Why would you want to reduce the ADC resolution? Most of the effects introduced can be simulated in GNU Radio, e.g. by converting a float stream to integer and dividing it by a constant power of two.

Greetings,
Marcus

On 30.06.2014 16:59, Leonardo S. Cardoso wrote:

Yes, 14 bits... mistyped the ADC resolution...

Thanks, Matt. I'll investigate this idea...

Leonardo S. Cardoso
address@hidden


On Mon, Jun 30, 2014 at 4:46 PM, Matt Ettus <address@hidden> wrote:

The n200 and n210 have 14 bit ADCs.

In any case, you can fake fewer bits by zeroing the low order bits in the
fpga.

Matt
On Jun 30, 2014 10:38 AM, "Leonardo S. Cardoso" <address@hidden> wrote:

Hello everyone,

I excuse myself on advance by my noob question...

I have an N210 with an SBX front end, and I want to experiment with
decoding signals at a lower resolution, rather than the default 12 bits
provided by the N210 ADCs. Does anyone know if (and how) can I limit the
resolution of the ADCs arbitrarily?

I am aware that I can reduce the resolution afterwards, mapping the
signals to a lower resolution in base band, but I'd really like to do that
before the DDC at the FPGA.

Cheers to everyone!

Leonardo S. Cardoso
address@hidden

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