Fast And Gate, 1 Ghz
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From: osr on 14 Feb 2010 11:19 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$. The Pulse ranges from 4 to 20 Nanoseconds, and his current idea is use the photodiode current to gate open a source of 1 ghz pulses and integrate,. The 2 Ghz source is the easy part< I have that.. The question is how to gate it. Sadly this is a single shot event at 1-4 hz and thus a sampling scope is out. I have no problem getting a photodiode with 47 picosecond rise time.. Suggestions, other then finding friends with higher salaries? My friend is a independent field service engineer on medical lasers. He has a idea for a replacement product to get him off the road, the cost of travel is slaughtering his once profitable business. He wants to build the prototype, and see if his idea works compared to a known working pulsed laser source. Some modern form of ECL? Steve
From: a7yvm109gf5d1 on 14 Feb 2010 11:43 On Feb 14, 11:19 am, o...(a)uakron.edu wrote: > Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs > to measure a laser pulse duration on almost no budget, perhaps > 200-300$. 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 http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=SY58051UMG%20TR-ND Of course this is all 50 ohm differential stuff but I'm sure you can figure it out.
From: Jim Thompson on 14 Feb 2010 12:05 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$. The Pulse ranges from 4 to 20 Nanoseconds, and his current >idea is use the photodiode current to gate open a source of 1 ghz >pulses and integrate,. The 2 Ghz source is the easy part< I have >that.. The question is how to gate it. Sadly this is a single shot >event at 1-4 hz and thus a sampling scope is out. I have no >problem getting a photodiode with 47 picosecond rise time.. > >Suggestions, other then finding friends with higher salaries? My >friend is a independent field service engineer on medical lasers. He >has a idea for a replacement product to get him off the road, the >cost of travel is slaughtering his once profitable business. He wants >to build the prototype, and see if his idea works compared to a known >working pulsed laser source. > >Some modern form of ECL? > >Steve http://www.azmicrotek.com/ Mention my name ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: dagmargoodboat on 14 Feb 2010 13:00 On Feb 14, 11:19 am, o...(a)uakron.edu wrote: > Can anyone suggest a fast AND gate at 1-2 Ghz. A friend of mine needs > to measure a laser pulse duration on almost no budget, perhaps > 200-300$. 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 Seems like a job for a single-slope integrating A/D. Integrate a current onto a cap while the pulse flies, then de-integrate at your leisure in-between pulses. -- Cheers, James Arthur
From: whit3rd on 14 Feb 2010 13:32
On Feb 14, 8:19 am, o...(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.. How about a diode mixer? They come completely specified for DC drive on one port, and it'll sure be easy to buy one completely built and connectorized. |