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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I'm looking for a diode capable of rectifying at 4MHz and wanted to see if anyone here had experience with diodes that could meet those requirements. (It must also be a thru-hole diode)
Basically, the only diodes I know of are the classic 1N5711 types or 1SS106/8, but these are only good for 15-30mA current max. I'm looking for something with a little more oomph.
I think some schottky's like the 1N5819 may work, but based on their junction C and reverse recovery (which i didn't think really applied with schottkys) seems to say otherwise.
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
EastVoltResearch wrote ...
Thanks Luca!
I guess the only trade-off with those would be the amount of junction capacitance.
The junction cap is in the range 50-100pF. You can simulate your circuit with an ideal diode //capacintance to see if rectification efficiency is accepatble for your application.
If you do not need 1A, probably you can find schottkys rated few hundreds of mA which have less junction capacitance.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Hi Dan.
Schottky diodes should work fine rectifying 4MHz. Is this for a power supply application? If so, a soft-switching design will be easier on the rectifier diodes. A 4MHz sinewave is a lot easier to rectify cleanly than a 4MHz squarewave because of the lower dv/dt around the turn-on and turn-off points. A 4MHz hard-switched SMPSU would be very hard on the rectifiers.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
GeordieBoy wrote ...
Hi Dan.
Schottky diodes should work fine rectifying 4MHz. Is this for a power supply application? If so, a soft-switching design will be easier on the rectifier diodes. A 4MHz sinewave is a lot easier to rectify cleanly than a 4MHz squarewave because of the lower dv/dt around the turn-on and turn-off points. A 4MHz hard-switched SMPSU would be very hard on the rectifiers.
-Richie,
Hi Richie,
No, this is just for a very simple wireless-energy transfer demonstration i'm cooking up for some students. Basically, i'm running a Class-E coil at 4MHz, and then have an identical resonator about 1-2 feet away in which i'm tapping off the primary, rectifying it, and then feeding it to illuminate about 10 LEDs in series.
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High Frequency Rectifier Diode ?
