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The only distributor-stock SRDs I know of are the M/Acom MA44767, MA44768, MA44769 parts, all SOT-23 and dirt cheap. I think Penstock carries them. The '68 or '69 should be good for multiplication to 2 GHz. For high ratios, an SRD will beat a plain diode by a huge amount. There are lots of appnotes around about using them as multipliers. I have a bunch in stock and can send a few to anybody who wants to play. I'd like to talk you out of a couple, and thanks for the supplier info. Wonder what MaCom's min order is? Anything you need in trade or a few green stamps? W4ZCB Call Book Address. |
The only distributor-stock SRDs I know of are the M/Acom MA44767, MA44768, MA44769 parts, all SOT-23 and dirt cheap. I think Penstock carries them. The '68 or '69 should be good for multiplication to 2 GHz. For high ratios, an SRD will beat a plain diode by a huge amount. There are lots of appnotes around about using them as multipliers. I have a bunch in stock and can send a few to anybody who wants to play. I'd like to talk you out of a couple, and thanks for the supplier info. Wonder what MaCom's min order is? Anything you need in trade or a few green stamps? W4ZCB Call Book Address. |
On Mon, 12 Apr 2004 22:16:01 GMT, "Harold E. Johnson"
wrote: The only distributor-stock SRDs I know of are the M/Acom MA44767, MA44768, MA44769 parts, all SOT-23 and dirt cheap. I think Penstock carries them. The '68 or '69 should be good for multiplication to 2 GHz. For high ratios, an SRD will beat a plain diode by a huge amount. There are lots of appnotes around about using them as multipliers. I have a bunch in stock and can send a few to anybody who wants to play. I'd like to talk you out of a couple, and thanks for the supplier info. Wonder what MaCom's min order is? Anything you need in trade or a few green stamps? W4ZCB Call Book Address. ^^^^^^^^^^^^^^^^^^ don't have one. Email me, with hopefully obvious despam. John |
On Mon, 12 Apr 2004 22:16:01 GMT, "Harold E. Johnson"
wrote: The only distributor-stock SRDs I know of are the M/Acom MA44767, MA44768, MA44769 parts, all SOT-23 and dirt cheap. I think Penstock carries them. The '68 or '69 should be good for multiplication to 2 GHz. For high ratios, an SRD will beat a plain diode by a huge amount. There are lots of appnotes around about using them as multipliers. I have a bunch in stock and can send a few to anybody who wants to play. I'd like to talk you out of a couple, and thanks for the supplier info. Wonder what MaCom's min order is? Anything you need in trade or a few green stamps? W4ZCB Call Book Address. ^^^^^^^^^^^^^^^^^^ don't have one. Email me, with hopefully obvious despam. John |
"John Larkin" wrote in message ... W4ZCB Call Book Address. ^^^^^^^^^^^^^^^^^^ don't have one. Email me, with hopefully obvious despam. http://qrz.com/callsign/w4zcb "PM" |
"John Larkin" wrote in message ... W4ZCB Call Book Address. ^^^^^^^^^^^^^^^^^^ don't have one. Email me, with hopefully obvious despam. http://qrz.com/callsign/w4zcb "PM" |
Hi Harold,
Nice of John to make that offer! As for background and theory, I'll make copies of an artcile or two to send you, about the discovery of the effect and the optimization of diode structure to enhance it. I suppose that the effect you're seeing with the Schottkys is almost entirely capacitive stored charge, and that won't "sweep out" of the diode with the sharp step you get with a step-recovery diode. The articles I'll send have info about efficiency, which can be surprisingly high considering the high order of multiplication. Cheers, Tom "Harold E. Johnson" wrote in message news:3QBec.21137$_K3.55643@attbi_s53... If you do use diodes for higher-order harmonic generation, and not just a simple full-wave-rectifier type frequency doubler, I suppose you want something of the nature of a step recovery diode. That implies minority carrier stored charge in the diode, and that would preclude using a Schottky diode (which would work great in the full-wave-rectifier type doubler). If you get into actually wanting to generate harmonic combs out to microwave frequencies, it's probably worthwhile looking for diodes actually characterized for step recovery service. But I really think that's way beyond what you are trying to accomplish right now. My turn to learn something here. Tom, would you elaborate a bit on the above please? I know SRD's are comb generators out to visible light, but they're also 50 percent hard to find and 50 percent magic. I've been using Schottky's for X16 multipliers to 2 GHz, am I doing something wrong? (I keep promising myself that I'm gonna substitute an MMIC for that one day, I DID find the "Filter Gain" in the line length from generator to filter), THAT was both impressive AND helpful. If I go with the MMIC, any preference of Silicon over GaAs? Regards W4ZCB |
Hi Harold,
Nice of John to make that offer! As for background and theory, I'll make copies of an artcile or two to send you, about the discovery of the effect and the optimization of diode structure to enhance it. I suppose that the effect you're seeing with the Schottkys is almost entirely capacitive stored charge, and that won't "sweep out" of the diode with the sharp step you get with a step-recovery diode. The articles I'll send have info about efficiency, which can be surprisingly high considering the high order of multiplication. Cheers, Tom "Harold E. Johnson" wrote in message news:3QBec.21137$_K3.55643@attbi_s53... If you do use diodes for higher-order harmonic generation, and not just a simple full-wave-rectifier type frequency doubler, I suppose you want something of the nature of a step recovery diode. That implies minority carrier stored charge in the diode, and that would preclude using a Schottky diode (which would work great in the full-wave-rectifier type doubler). If you get into actually wanting to generate harmonic combs out to microwave frequencies, it's probably worthwhile looking for diodes actually characterized for step recovery service. But I really think that's way beyond what you are trying to accomplish right now. My turn to learn something here. Tom, would you elaborate a bit on the above please? I know SRD's are comb generators out to visible light, but they're also 50 percent hard to find and 50 percent magic. I've been using Schottky's for X16 multipliers to 2 GHz, am I doing something wrong? (I keep promising myself that I'm gonna substitute an MMIC for that one day, I DID find the "Filter Gain" in the line length from generator to filter), THAT was both impressive AND helpful. If I go with the MMIC, any preference of Silicon over GaAs? Regards W4ZCB |
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