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From: email@example.com (Glen Walpert)
Subject: Re: Comb/Harmonic Generators
X-Newsreader: News Xpress 2.01
Date: Thu, 05 Dec 2002 20:01:31 GMT
NNTP-Posting-Date: Thu, 05 Dec 2002 15:01:31 EST
Organization: Net Access (netaxs.com)
In article , "John Jardine" wrote:
>Vance wrote in message
>> Please forgive the dual post - I'm not familiar with the traffic.
>> I'm from Picosecond Pulse Labs and we've cobbled together a comb
>> generator which displays some very interesting characteristics. I'm
>> making this post for a little market feedback, as we're not systems
>> designers who use these components.
>> These devices are not SRD based, so they're not tuned. This means
>> their input frequency can vary - like 500Mhz to 15Ghz. The harmonic
>> content is quite strong due to some proprietary technology and we see
>> more than -10dmb at 40Ghz for a 2Ghz, +10dbm input. The device
>> consumes about 1.4W.
>> My questions are these: Are these three characteristics (variable
>> input, input frequencies to 15Ghz, and significantly higher harmonic
>> power) of significant value to designers? Are there other
>> alternatives? Does this enable other trade offs in the design?
>> Thanks for your feedback.
Step Recovery Diode
>Otherwise, sounds to me like you've invented a diode ;-)
No, they have invented a non-linear transmission line edge compressor!
I saw these advertised in one of the trade rags a while ago, and have been
trying to figure out how they work ever since. My guess is that they work in
a method analogous to accoustic edge compression - the effective dielectric
constant of the transmission line either decreases with increasing voltage
(for positive edge compression) or increases (for negative edge compression),
causing the higher voltage parts of the pulse to travel faster (or slower)
than lower voltage parts. (In sound propogation the higher pressure part of
the wave travels faster than the lower pressure part, an effect only
observable at high sound pressures when adiabatic compression causes
significant heating, usually ignored in basic acoustic primers but very
important in non-linear acoustics.)
There is a diode built into these transmission lines, and apparently the
effective dielectric constant of the transmission changes with the bias of the
diodes? Perhaps Vance could tell us something about these?
Sorry, I can't think of a good use for them at the moment. Interesting
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