From: "Robert Lutwak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] More on paralleling output gates Date: Sun, 9 Apr 2006 16:04:49 -0400 Message-ID: <[EMAIL PROTECTED]>
> I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope. He is close... tau of 1.1 ns should be expected from a 400 MHz. I am sitting here and thinking "Hey, isn't those 3 x 50 Ohm sources in parallel a impedance missmatch?". If you have a sufficiently long system (> 1/12 of the risetime in cable-length which in this case would mean maybe 50 cm or so) we must consider it as an impedance system and thus we should care less about the bulk capacitance behaviour (which can be "cured" with a stronger source) but rather with the source and load impedances relative the cable impedance. I'd like to view the exercise as only mildly interesting. Better to find a better source for that signal. If you feel like toying around more on that '04 then directly parallel the outputs into a single 47 Ohm resistor might be more productive. Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts