Bill Now this discussion gets really interesting. You are doing something and will report results. You have my attention. Regards Paul WB8TSL
On Fri, Apr 15, 2016 at 12:27 PM, BIll Ezell <w...@quackers.net> wrote: > I'm amazed at how much traffic this has generated. > Thanks Brooke, you're exactly on-topic as usual. > > As I said originally, I wanted a quick-and-dirty-and-cheap, and I'm using > an SMMD-835 SRD. Making up the test layout tonight. > I'm starting with a 100 uA bias on the diode, and a 20 pF diode-to-load > coupling cap, driving the SRD with a 5V 1Mhz square-wave. > > I'm also going to try the 2N3904 Vce-reverse-bias avalanche idea just for > fun. > > I'll post again after I have some results. > > PS - as I've mentioned before, I trim these things. I hate the > endlessly-requoted replies, impossible to parse what's actually been said. > > --- Brooke post, trimmed -- > Hi: > > The idea with a step recovery diode is that during forward bias the diode > stores charge. When the polarity reverses the diode continues to conduct > until the charge has been depleted. At that time the diode stops > conducting and opens. > Suppose this was done using a square wave. The length of the positive > (charging) half of waveform needs to be long enough so that the diode if > fully charged (a function of the diode lifetime and charging current). > Then on the negative half (discharging) when all the charge has been > extracted the diode turns of making a sharp edge. So the diode lifetime is > important in relation to input drive frequency. For a sinewave drive the > lifetime should be about 1/4 the period at the recommended drive level. > > -- > Bill Ezell > ---------- > The day Microsoft makes something that doesn't suck > will be the day they make vacuum cleaners. > Or maybe Windows 10. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
