From: John Larkin
Subject: Re: Comb/Harmonic Generators
Date: Thu, 05 Dec 2002 11:17:49 -0800
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On 5 Dec 2002 10:13:24 -0800, firstname.lastname@example.org (Vance) wrote:
>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.
I'm guessing that not a lot of people need a high-power wideband comb
generator. Plus, there are so many dirt-cheap compound-semi fets and
transistors around these days, it would be hard to justify this as a
single-frequency, ultra-low-efficiency RF source. Maybe the
military/ECM boys would be interested.
Is this a shock line?
A bit of lore: SRD was discovered by accident, in 1959 I think, by
Boff. He was experimenting with a diode frequency multiplier and was
getting an unaccountably large harmonic output, more than a diode can
theoretically make. The HP185 sampling scope was brand new (it
initially used an avalanche transistor to make the sampling pulse) so
they hooked that up and lo, they saw the step. Soon the sampling
scopes were using 'Boff diodes' too. The name 'Boff Diode' didn't
I have a few old PSPL boxes on my collection; cool stuff.