[eagle] Re: Eagle Microwave Antenna Arrays-- mechanical concepts
matt at ettus.com
Mon Mar 26 15:07:31 PST 2007
John B. Stephensen wrote:
> The big current spike is during start up and the static current
> afterwards is low enough so that you can manage power dissiation.
Simply not true. Large 65nm FPGAs dissipate several watts of standby power.
> wouldn't use DCMs for the reciver as it must deal with multiple
> narrow-bandwidth signals. The downlink will be about 2 Mbaud BPSK so
> phase noise isn't a big issue in generating low-frequency signals to
> be upconverted.
I can speak from experience here. Clocks coming out of the FPGA are
simply not clean enough to use for this purpose.
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