Randy,
IT also makes for a slew of birdies and lots of circuitry and maybe a needs for shielding.
Since according to some you can make IQ phasing work perfect at only one frequency
why not stop at the first conversion you suggested 45mhz (or even 63) and then do
the IO conversion there to audio.
DSP simplifies the audio and can be made to have filters as well but to do it well you
need a lot of bits in the ADC and a fair amount of processing speed. Modern 32bit DSP
chips do that but ADCs of less than 16bits limit dynamic range.
Doing the processing at audio using linear parts (opamps) can easily get the needed
performance and at far lower consumed power. The dynamic range is limited only by
the design details.
Allison
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