Hi Tom, Thank you for the answer. rise and fall times are 1 and 2 us respectively. rise time is more important. the voltage is design-able in the analog section. ( ie 0-1 V, 0-3V, ... ) 10 bits of resolution seems suitable. the signal doesn't repeat any more. it takes place one time. i achieved to 20 MSPS ( for two channels ) for now. it remains two questions: 1) analog bandwidth 2) interface Regards, Ras
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