If you're up to that kind of thing, I'd suggest an FPGA with a
fairly big internal memory and dedicated capture.? SPI interface
to registers would work well.? That way, you're not limited to the
microprocessor and the limitation is firstly the ADC, then the
analog front end.
Harvey
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Just sharing my project.
My fastest scope so far is 23 MS/s and just a single channel.
I use Analogue Devices AD9283 which comes in versions up to
100MS/s.
The weakest link in the chain is the microcontroller which runs at
72MHz but cant clock out the A2D data as fats as it will run.
The analogue bit is just some fast op amps with a multiplexor for
switching in different op amp feedback resistors?to set the gain.
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