Hi Bruce: One way to do that is pair up a long lifetime PIN and a schottky of polarities such that the Schottky current forward biases the PIN. DC block the input and output. I made microwave limiters this way many decades ago.
Re: Schottky Diodes There are two flavors. A pure Schottky diode is made up of a single metal semiconductor junction. These typically have reverse breakdown voltages in the 3 to 5 volt area. If a "Schottky" diode has a higher Vbr then it's what's called a "Guard Ring" type. These have a P/N junction surrounding the schottky junction that increases the reverse breakdown and another P/N junction to isolate the two forward curves. Sometimes these are made improperly where the second PN junction gets shorted and then there's a "double break" in the forward I-V curve and charge storage (slow operation) is associated with them. When HP first introduced microwave Schottky diodes they put a reverse recovery time spec on them when in fact it was zero. For more on Microwave Diodes see: http://www.prc68.com/I/Diodes.html Have Fun, Brooke Clarke http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam Bruce Griffiths wrote: > Robert Berg wrote: > >>Bruce, >> >>Thanks for the ideas. The HSMS-2822 looks like it could serve in the >>detector role, while a pair of HSMP-3822's might work for clamping--low >>capacitance, matched pair in series, and in stock at Mouser. The 3822 is >>actually a pair of PIN switch diodes, but couldn't it function as a clamper? >>The 482x series looks better for clamping, but isn't available in a >>series-pair configuration. There are other possibilities, but not many in >>stock, and I couldn't find any suitable ring diode packages. >> >>Bob >>WA7ZRX >> >> > > Bob > > A PIN diode shunt clamp can be used, however it will take a while to > respond so some other means to clamp the unwanted energy during the time > it takes to turn on the PIN diode clamp may be necessary. > > Bruce > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
