Re: [Discuss-gnuradio] An analog RF question

[Eric Brombaugh]

Sounds like a fun study. I looked at using some of those ADRF6510 ADC 
drivers with built-in programmable analog LPFs a while back. They're 
highly integrated but fairly expensive and really power-hungry.

Eric

On 05/21/2018 11:21 AM, Marcus D. Leech wrote:
> On 05/21/2018 01:59 PM, Dan CaJacob wrote:
> > Hey Marcus,
> >
> > This may not be what you are looking for, but these are awesome. They 
> > may be going to space soon :) 
> > http://www.newedges2.com/products/SAX239-R2_Datasheet_February-27th-2018.pdf
> Interesting.  Not quite what I was looking for.
>
> Basically just doing a design-tradeoff study for grins.
>
> Fixed sample rate and filter/decimate in a "sized-for-economy" FPGA, or 
> variable sample-rate, and a chain of tuneable analog filters in front of the
>    ADC.
>
> A chain of 3 or 4 2nd-order active-lowpass filters using video op-amps 
> would probably work OK.  Use digipots to set the R values, and use a fixed
>    value for C, or perhaps selectable C as well (probably only two or 
> three values).
>
> Or, a small number (4?) of selectable L-C-R low-pass filters, and fix 
> the sample rates to a small number.