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From: John Larkin on 24 Nov 2009 21:26
On Tue, 24 Nov 2009 18:38:15 -0600, "Tim Williams"
<tmoranwms(a)charter.net> wrote:

>"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message
>news:693og5hakrhlo8ofvf4qs7q1rv52sisnr5(a)4ax.com...
>> Why not? Things scale. People use dipoles+schottkies at way higher
>> frequencies than this.
>
>Have they done it monolithic yet? Should be fairly simple to, say, lay down
>an aluminum dipole on top of SiO2 dielectric, on top of fairly conductive
>(n+?) silicon, for a not-too-awful antenna element, then put a rectifying
>schottky junction in the middle, plus tracks leaving the site for power out.
>Then repeat the array a brazillion times. Then, scale it down, so the
>antenna is around 800nm wavelength or so (should be possible with today's
>newest processes?). Does that work?
>
>Tim

I don't know about visible, but it's been none in the THz range.

John

From: Joerg on 24 Nov 2009 21:29
John Larkin wrote:
> On Tue, 24 Nov 2009 17:33:18 -0800, Joerg <invalid(a)invalid.invalid>
> wrote:
>
>> John Larkin wrote:

[...]

>>
>>> Oh, here's that other detector diode:
>>>
>>> http://www.aeroflex.com/AMS/Metelics/pdfiles/SMS201.pdf
>>>
>>> Cute little devil.
>>>
>> But that really needs IR reflow soldering or at least a hot air station.
>
>
> Oh quitcherbitchin. It's ZERO POINT ZERO EIGHT PICOFARADS.
>

But only if you connected it with one strand each plucked from a
super-fine litz wire :-)

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: Fred Bartoli on 25 Nov 2009 09:24
Joerg a �crit :
> John Larkin wrote:
>> On Tue, 24 Nov 2009 13:18:06 -0800, Joerg <invalid(a)invalid.invalid>
>> wrote:
>>
>>> John Larkin wrote:
>
> [...]
>
>>>> It's surprising what fast stuff you can do with tiny surface-mount
>>>> parts on pc boards, things that used to need plumbing.
>>>>
>>> That is true. Except the stuff inside the sampler heads you showed
>>> us, that probably won't fly with SMT packages.
>>
>> Agoston Agoston showed me a 20 GHz sampler he did, surface-mount parts
>> on FR4. A lot of stuff that used to be hybrids can be done now surface
>> mount, too.
>>
>
> True. He seems to be a guy who rolls up his sleeves and gets stuff done.
> It is similar with phenolic. Lots of people say it ain't any good for
> anything past audio. Wrong. I have a few VHF/UHF splitters here that are
> done in two-layer phenolic.
>
> The first 144MHz transistor power amp I ever built was also on phenolic
> because back in those university days buying FR4 would have required
> tapping the beer kitty and that was off limits.
>
>
>> Oh, here's that other detector diode:
>>
>> http://www.aeroflex.com/AMS/Metelics/pdfiles/SMS201.pdf
>>
>> Cute little devil.
>>
>
> But that really needs IR reflow soldering or at least a hot air station.
>

Uh! IR reflow or hot air for something that big? I routinely do 0201
without anything special. Just a stereo microscope and a metcal but you
sure have those, don't you?
I (almost) just can't imagine anything easier to solder...

--
Thanks,
Fred.
From: Fred Bartoli on 25 Nov 2009 09:26
Tim Williams a �crit :
> "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message
> news:693og5hakrhlo8ofvf4qs7q1rv52sisnr5(a)4ax.com...
>> Why not? Things scale. People use dipoles+schottkies at way higher
>> frequencies than this.
>
> Have they done it monolithic yet? Should be fairly simple to, say, lay down
> an aluminum dipole on top of SiO2 dielectric, on top of fairly conductive
> (n+?) silicon, for a not-too-awful antenna element, then put a rectifying
> schottky junction in the middle, plus tracks leaving the site for power out.
> Then repeat the array a brazillion times. Then, scale it down, so the
> antenna is around 800nm wavelength or so (should be possible with today's
> newest processes?). Does that work?
>

And package that in a mint black epoxy package? :-)

I think Phil Hobbs wrote something about this when he still was at IBM...


--
Thanks,
Fred.
From: John Larkin on 25 Nov 2009 12:12
On Wed, 25 Nov 2009 15:26:47 +0100, Fred Bartoli <" "> wrote:

>Tim Williams a �crit :
>> "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message
>> news:693og5hakrhlo8ofvf4qs7q1rv52sisnr5(a)4ax.com...
>>> Why not? Things scale. People use dipoles+schottkies at way higher
>>> frequencies than this.
>>
>> Have they done it monolithic yet? Should be fairly simple to, say, lay down
>> an aluminum dipole on top of SiO2 dielectric, on top of fairly conductive
>> (n+?) silicon, for a not-too-awful antenna element, then put a rectifying
>> schottky junction in the middle, plus tracks leaving the site for power out.
>> Then repeat the array a brazillion times. Then, scale it down, so the
>> antenna is around 800nm wavelength or so (should be possible with today's
>> newest processes?). Does that work?
>>
>
>And package that in a mint black epoxy package? :-)
>
>I think Phil Hobbs wrote something about this when he still was at IBM...

He was doing THz stuff with some other sort of rectifying junction. I
think schottkies may be too slow for optical wavelengths.

I've seen papers on schottky-based signal samplers that worked to 250,
or maybe 500 GHz.

John

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