Fast And Gate, 1 Ghz
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From: Jure Newsgroups on 14 Feb 2010 15:32 <osr(a)uakron.edu> wrote in message news:34b75f54-0b1b-4c24-8e5e-fd09ca26f8c5(a)c5g2000vbh.googlegroups.com... > Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs > to measure a laser pulse duration on almost no budget, perhaps ..... > Some modern form of ECL? > > Steve how about the ECLinPS family and its variants...? http://www.onsemi.com/PowerSolutions/taxonomy.do?id=273 http://www.onsemi.com/PowerSolutions/parametrics.do?id=246 Jure Z.
From: John Larkin on 14 Feb 2010 20:35 On Sun, 14 Feb 2010 08:19:11 -0800 (PST), osr(a)uakron.edu wrote: >Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs >to measure a laser pulse duration on almost no budget, perhaps >200-300$. The Pulse ranges from 4 to 20 Nanoseconds, and his current >idea is use the photodiode current to gate open a source of 1 ghz >pulses and integrate,. The 2 Ghz source is the easy part< I have >that.. The question is how to gate it. Sadly this is a single shot >event at 1-4 hz and thus a sampling scope is out. I have no >problem getting a photodiode with 47 picosecond rise time.. > >Suggestions, other then finding friends with higher salaries? My >friend is a independent field service engineer on medical lasers. He >has a idea for a replacement product to get him off the road, the >cost of travel is slaughtering his once profitable business. He wants >to build the prototype, and see if his idea works compared to a known >working pulsed laser source. > >Some modern form of ECL? > >Steve The Eclips Plus gates would be about right, if you really need gates. ON and Micrel make them. But one of the Analog Devices fast (ecl/pecl) comparators might be all you need. It could discriminate the photodiode signal, and you could use its ECL output and a couple of transistors to steer a current into an integrating cap to give pulse width. If you count a 2 GHz source, the resolution will be 500 ps, so you'll only get 8 to 40 ticks. An analog trick could give lots better resolution. John
From: Joerg on 15 Feb 2010 12:31 John Larkin wrote: > On Sun, 14 Feb 2010 08:19:11 -0800 (PST), osr(a)uakron.edu wrote: > >> Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs >> to measure a laser pulse duration on almost no budget, perhaps >> 200-300$. The Pulse ranges from 4 to 20 Nanoseconds, and his current >> idea is use the photodiode current to gate open a source of 1 ghz >> pulses and integrate,. The 2 Ghz source is the easy part< I have >> that.. The question is how to gate it. Sadly this is a single shot >> event at 1-4 hz and thus a sampling scope is out. I have no >> problem getting a photodiode with 47 picosecond rise time.. >> >> Suggestions, other then finding friends with higher salaries? My >> friend is a independent field service engineer on medical lasers. He >> has a idea for a replacement product to get him off the road, the >> cost of travel is slaughtering his once profitable business. He wants >> to build the prototype, and see if his idea works compared to a known >> working pulsed laser source. >> >> Some modern form of ECL? >> >> Steve > > The Eclips Plus gates would be about right, if you really need gates. > ON and Micrel make them. > > But one of the Analog Devices fast (ecl/pecl) comparators might be all > you need. It could discriminate the photodiode signal, and you could > use its ECL output and a couple of transistors to steer a current into > an integrating cap to give pulse width. > > If you count a 2 GHz source, the resolution will be 500 ps, so you'll > only get 8 to 40 ticks. An analog trick could give lots better > resolution. > Fully agree, this really calls for the analog integrator. With a 2GHz source you'd also get tons of "amplitude jitter". Sometimes it catches three pulses, sometimes only two, stuff like that. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: John Larkin on 15 Feb 2010 12:56 On Mon, 15 Feb 2010 09:31:21 -0800, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> On Sun, 14 Feb 2010 08:19:11 -0800 (PST), osr(a)uakron.edu wrote: >> >>> Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs >>> to measure a laser pulse duration on almost no budget, perhaps >>> 200-300$. The Pulse ranges from 4 to 20 Nanoseconds, and his current >>> idea is use the photodiode current to gate open a source of 1 ghz >>> pulses and integrate,. The 2 Ghz source is the easy part< I have >>> that.. The question is how to gate it. Sadly this is a single shot >>> event at 1-4 hz and thus a sampling scope is out. I have no >>> problem getting a photodiode with 47 picosecond rise time.. >>> >>> Suggestions, other then finding friends with higher salaries? My >>> friend is a independent field service engineer on medical lasers. He >>> has a idea for a replacement product to get him off the road, the >>> cost of travel is slaughtering his once profitable business. He wants >>> to build the prototype, and see if his idea works compared to a known >>> working pulsed laser source. >>> >>> Some modern form of ECL? >>> >>> Steve >> >> The Eclips Plus gates would be about right, if you really need gates. >> ON and Micrel make them. >> >> But one of the Analog Devices fast (ecl/pecl) comparators might be all >> you need. It could discriminate the photodiode signal, and you could >> use its ECL output and a couple of transistors to steer a current into >> an integrating cap to give pulse width. >> >> If you count a 2 GHz source, the resolution will be 500 ps, so you'll >> only get 8 to 40 ticks. An analog trick could give lots better >> resolution. >> > >Fully agree, this really calls for the analog integrator. With a 2GHz >source you'd also get tons of "amplitude jitter". Sometimes it catches >three pulses, sometimes only two, stuff like that. Hey, I can see your posts again! John
From: Joerg on 15 Feb 2010 13:56
John Larkin wrote: > On Mon, 15 Feb 2010 09:31:21 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > >> John Larkin wrote: >>> On Sun, 14 Feb 2010 08:19:11 -0800 (PST), osr(a)uakron.edu wrote: >>> >>>> Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs >>>> to measure a laser pulse duration on almost no budget, perhaps >>>> 200-300$. The Pulse ranges from 4 to 20 Nanoseconds, and his current >>>> idea is use the photodiode current to gate open a source of 1 ghz >>>> pulses and integrate,. The 2 Ghz source is the easy part< I have >>>> that.. The question is how to gate it. Sadly this is a single shot >>>> event at 1-4 hz and thus a sampling scope is out. I have no >>>> problem getting a photodiode with 47 picosecond rise time.. >>>> >>>> Suggestions, other then finding friends with higher salaries? My >>>> friend is a independent field service engineer on medical lasers. He >>>> has a idea for a replacement product to get him off the road, the >>>> cost of travel is slaughtering his once profitable business. He wants >>>> to build the prototype, and see if his idea works compared to a known >>>> working pulsed laser source. >>>> >>>> Some modern form of ECL? >>>> >>>> Steve >>> The Eclips Plus gates would be about right, if you really need gates. >>> ON and Micrel make them. >>> >>> But one of the Analog Devices fast (ecl/pecl) comparators might be all >>> you need. It could discriminate the photodiode signal, and you could >>> use its ECL output and a couple of transistors to steer a current into >>> an integrating cap to give pulse width. >>> >>> If you count a 2 GHz source, the resolution will be 500 ps, so you'll >>> only get 8 to 40 ticks. An analog trick could give lots better >>> resolution. >>> >> Fully agree, this really calls for the analog integrator. With a 2GHz >> source you'd also get tons of "amplitude jitter". Sometimes it catches >> three pulses, sometimes only two, stuff like that. > > > Hey, I can see your posts again! > I have no clue why they didn't make it through your ISP before. Not sure which news provider you use but sometimes ISPs or newsserver companies take the liberty to hose off posts according to what they feel. I guess we can thank companies like Google for that :-( The most gross blanket hose-off happened a few years ago when the largest German ISP obviously chucked all Pacific Bell domain emails. I had calls from Germans, desperate for answers from American business colleagues that didn't get through. That's when it finally also dawned on them that ditching the fax machine was not a good idea. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |