On Thu, 24 Feb 2005, Alberto di Bene wrote:
But what you are saying is that I can put two pure sine signals at e.g.
1 MHz, one of them
of 1V amplitude, and the other of 1uV amplitude, separated by, let's
say, 1 kHz, digitize them with
a 16-bit, 100 MHz ADC and then, by simply decimating (low pass +
subsampling) and applying a
post-decimation filter, I can resolve them ?
Why not if ADC overload treshold is more then 1V? Certanly noise dithering
assumed. If sigs are 'pure' sin then You can use generaly as narrow
bandwidth digital filter as You need. Then noise dithering an
quantisation noise deposit to out sig can be as small as is needed. If CPU
is powerfull enough of cose. May be I am not right but why, where mistake
is?
73 de RA9MB/Alex
http://www.qsl.net/ra9mb
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