Microwage RF detector
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From: Fred Bartoli on 25 Nov 2009 12:23 John Larkin a �crit : > 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. > Oh, that's only 0.5THz? How slow... :-) Now, back to my fast 20kHz sensor design. -- Thanks, Fred.
From: Jim Thompson on 25 Nov 2009 12:37 On Wed, 25 Nov 2009 09:12:09 -0800, John Larkin <jjSNIPlarkin(a)highTHISlandtechnology.com> wrote: >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 I vaguely recall Josephson Junctions ?? ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 |
From: John Larkin on 25 Nov 2009 12:42 On Wed, 25 Nov 2009 18:23:04 +0100, Fred Bartoli <" "> wrote: >John Larkin a �crit : >> 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. >> > >Oh, that's only 0.5THz? How slow... :-) > >Now, back to my fast 20kHz sensor design. Oh, goodle thz schottky They do work up there. John
From: JosephKK on 3 Dec 2009 23:24 On Wed, 25 Nov 2009 10:37:45 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Wed, 25 Nov 2009 09:12:09 -0800, John Larkin ><jjSNIPlarkin(a)highTHISlandtechnology.com> wrote: > >>On Wed, 25 Nov 2009 15:26:47 +0100, Fred Bartoli <" "> wrote: >> >>>Tim Williams a écrit : >>>> "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 > >I vaguely recall Josephson Junctions ?? > > ...Jim Thompson Somebody did a 70 GS/s 'Scope with them over 25 years ago. It required liquid Helium for the JJ. I think is was 6 bits and 4k sample depth. But that is all i still remember.
From: John Larkin on 3 Dec 2009 23:52
On Thu, 03 Dec 2009 20:24:00 -0800, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Wed, 25 Nov 2009 10:37:45 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>On Wed, 25 Nov 2009 09:12:09 -0800, John Larkin >><jjSNIPlarkin(a)highTHISlandtechnology.com> wrote: >> >>>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 >> >>I vaguely recall Josephson Junctions ?? >> >> ...Jim Thompson > >Somebody did a 70 GS/s 'Scope with them over 25 years ago. It >required liquid Helium for the JJ. I think is was 6 bits and 4k >sample depth. But that is all i still remember. That was Hypres, a 70 GHz analog bandwidth equivalent-time sampler. The scope wasn't very practical and they discontinued it. Tek and HP did the same at room temperature. Their web site is down, so maybe they are gone. John |