On Thu, 2012-05-03 at 17:29 -0400, W2XJ wrote:
> I agree. A complete transmitter would solve many technical issues and
> depending on the implementation, could drastically improve performance.
> Solid State broadcast transmitters that transmit digital carriers along
> with analog and therefore must run in linear mode can achieve IMD under
> -80 DBC using techniques most easily implemented in a composite unit.
> For an I/Q interface, I think SDR has evolved to the point that Ethernet
> is all that is required. Any control or tuning can use the same Ethernet
> connection.
I was thinking in terms of taking the data (possibly as ethernet frames)
straight into a modest FPGA and then doing the upsample followed by
cordic carrier generation thing in the gate array.
Something like a very modest cyclone III should suffice I would have
thought.
Output could be either full on EER/PWM or partial EER with cartesian
feedback via a high speed ADC with the loop closed right in the gate
array.
Regards, Dan.
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