Hello,
I wondered what interest there is in HW which can perform capture, but
is
more limited than the USPR2 type devices. For a different project I made
a
high-speed ADC interface, which runs over USB. It’s one channel, 100
MSPS.
I won’t attach images so you can see details at
http://www.newae.com/tiki-index.php?page=ProjectOpenADC .
It does not do real-time streaming, but captures a short number of
samples
(e.g.: that board has LPDDR memory which can fit ~32M samples), and
downloads them slowly over USB.
The site has an example of measuring the roll-off due to front-end -
note
this graph alone is fairly misleading, as the SFDR limit is a lot lower
(~300 MHz analog BW). If you do filtering after digitizing & know where
the
spurs are you can get a pretty high analog BW. have to upload full
details
of the spurs. There is also an adjustable amplifier which lets you crank
up
to ~50dB of gain on any incoming signals (you can go higher but noise
becomes an issue, need shielding) but with a much smaller analog BW.
If there was interest I could look into getting a batch of PCBs made.
The
ADC + Amp chip are the main expense (~$15 each), I would imagine
assembled
cost would be in the $60-$100 range. It’s all open hardware so I’m not
exactly getting rich here J
Regards,
-Colin