[hpsdr] Mercury mixer

[John B. Stephensen]

For direct RF digitization, the Analog Devices AD9444 or AD9445 may be
better than the Linear Technology ADC as the IMD is lower, giving a 102 dBFS
two-tone dynamic range. The data sheet makes it clear that LVDS outputs must
be used to obtain this level of performance so either a remote ADC board or
shielding of the ADC input may be required to prevent contamination by
digital noise radiated by on-board logic, the Atlas bus and adjacent cards.

73,

John
KD6OZH

----- Original Message ----- 
From: "Philip Covington" <p.covington at gmail.com>
To: "John B. Stephensen" <kd6ozh at comcast.net>
Cc: <hpsdr at hpsdr.org>
Sent: Saturday, June 10, 2006 01:04 UTC
Subject: Re: [hpsdr] Mercury


> On 6/9/06, John B. Stephensen <kd6ozh at comcast.net> wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > What size FPGA is planned for the Mercury board?
> >
> > 73,
> >
> > John
> > KD6OZH
>
> Hi John,
>
> Phil H and I were just talking about this.  It is TBD...but I can say
> it won't be the little Cyclone II on the OZY.  We should have a better
> idea pretty soon.  I was doing some filter design stuff with MATLAB
> today.  I want it to be big enough to be able to do some serious DSP
> in it.
>
> 73 de Phil N8VB


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