Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
High speed diode - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: High speed diode Posted: Mon Aug 22, 2005
I am looking for a diode or a rectifier IC that
works at frequencies in the range of 3mhz to 50mhz.
The regular 1N4001
are not at all useful and are designed to work in the hertz range (
subject: DiodePosted: Mon Aug 22, 2005 8:07 pm
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?
Post subject: re: diodePosted: Mon Aug 22, 2005
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.
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.