probably not HARD amplitude limited. sign bit would still rule though...
but band limited of course. and if in linear mode, AGCed so there would
be a reasonably consistent level there, FM or SSB probably 10-16dB max
dynamic range. (guess)
still worthwhile doign your numbers to see where all the sampling
products land, and also, where the aliases of the harmonics present on
the fitler output (non zero) and 2f of the created ADC distortion land.
the 2f and 3f can get very bad with under specified sample AND holds
when operating super nyquist.
On 2/05/2018 9:51 AM, David Rowe wrote:
I like it. good use of undersampling. Although the SFDR of the
microcontroller at 4x undersampling is probably in the toilet, since
it is band limited, that does not matter of course. very good.
Glen - would the FM be limited by that stage? That would mean a
simple ADC would suffice, we're just looking for the sign bit.
- David
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