Post subject: High speed diode Posted: Mon Aug 22,
2005 3:59 pm
I am looking for a diode or a rectifier
IC that works at frequencies in the range of 3mhz to 50mhz.
regular 1N4001 are not at all useful and are designed to work in
the hertz range ( around 50hz).
Post subject: DiodePosted: Mon Aug 22, 2005 8:07
Try a 1N914, 1N3600, or 1N4148 if you just need
an ordinary signal diode.
That said, do you need something
special, like a 1 Amp current rating or a 100 PIV or greater rating?
re: diodePosted: Mon Aug 22, 2005 8:16 pm
I don't need the 1A
diode. Just high speed for now.
Do you know if the rectification
is good. I used 1N4001 to rectify a 3mhz signal, it just cannot
do it. There is no rectification at that frequency, the input appears
across the output with some voltage drop.
I really need a
diode, that does not allow -ve part of the signal thru. Not even
that little spike when signal crosses zero to -ve area.
Post subject: Diode selectionPosted: Tue
Aug 23, 2005 7:37 pm
Every PN junction diode has a Trr specification
- "Time for Reverse Recovery", which represents the time necessary
to remove carriers from the junction area. If you want zero, or
as little as possible, you're pushed toward Schottky Barrier diodes.
Unfortunately, the junction capacitance of Schottky Barrier
diodes is higher than that of PN junction diodes - and that may
be an issue for you as well.
That said, I've had good luck
with Agilent (HP) SBD's such as the 1N5712 in that frequency range.