[eagle] Re: Eagle Microwave Antenna Arrays-- mechanical concepts

Matt Ettus 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.


Matt


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