[eagle] Re: Eagle Microwave Antenna Arrays-- mechanical concepts
matt at ettus.com
Sun Mar 25 13:40:32 PST 2007
John B. Stephensen wrote:
> The amount of power required by the FPGA depends on the number of
> logic elements used and the speed of operation. Anything that isn't
> clocked in the FPGA consumes almost no power so the thermal
> dissipation is controlled by the logic designer.
This is not true anymore. Small geometry devices (< 90nm) can consume a
lot of static power.
> DCMs require a lot
> less power than an external DDS and an FPGA would be a good place to
> put other logic.
DCMs have horrible phase noise. You wouldn't want to use them for
generating clocks for ADCs, DACs, LOs, or PLLs.
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