[hpsdr] ADC Question

[Larry Gadallah]

Hi Andrew:

On 26 July 2012 13:46, Andrew <irbsurfing at yahoo.co.uk> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Hi Larry,
> Unfortunately the LTC2207 and LTC2208 are not pin compatible, the former
> is 48 pin QFN and the latter a 64 pin due to the use of LVDS for the output
> data lines.
>

Hmmm, I must have confused it with the LTC2209. Regardless, the point is
that it would be interesting to experiment with an HF-only arrangement
where an ADC with the absolute best ENOB and SFDR was used in an attempt to
get a bit closer to analog Rx performance without needing a preamp. From my
casual research it doesn't look like anyone (TI, LTC, ADC) has anything
much more than 2-3 dB better than the LTC2208, so it seems that this might
be a process/technology limitation.

I had already thought about doing this! Trying to make it fit would be very
> interesting and not recommended without a specially designed pcb carrier -
> that just might work.....mmm.
>

I keep thinking that if we limit ourselves to a maximum Rx frequency of 30
MHz or so, it should be possible to build a nice little Rx with 100-Base-T
Ethernet (maybe even PCI). It probably wouldn't be much cheaper than
Mercury given the costs of the ADC and FPGA, but it would be getting close
to having a "blade" receiver architecture :-).

73's,
> Andrew
>

Cheers,
-- 
Larry Gadallah, VE6VQ/W7                          lgadallah AT gmail DOT com
PGP Sig: B5F9 C4A8 8517 82AC 16B6  02B6 0645 69F0 1F29 A512
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