Fast And Gate, 1 Ghz
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From: Michael A. Terrell on 18 Feb 2010 10:28 Joerg wrote: > > osr(a)uakron.edu wrote: > > Since this is for my friend's field diagnostics, the pretrigger is the > > box held in his right hand while he hits the doctor's trigger pedal > > with his right foot. > > > > I've been told to look at LVDS receivers for the compare portion, any > > suggestions for a fast switch for the current steering, if we go that > > way? I'm looking at some 2N918 in the scrap box, but with a 2 nsec > > rise and fall that is probably too slow... > > > > That would be like showing up at the Daytona race track in an AMC > Gremlin :-) You would be better off in an asphalt truck. :( -- Greed is the root of all eBay.
From: langwadt on 18 Feb 2010 17:53 On 17 Feb., 01:25, Joerg <inva...(a)invalid.invalid> wrote: > o...(a)uakron.edu wrote: > > The laser is 4 millijoules. give or take. The NB4N316M looks good, I > > think we may start there... > > Got to overcome that 25mV hysteresis though. For this app a hysteresis > might not be all that great because it'll skew your timing. Maybe Lasse > knows a version sans hysteresis? > I just happend to see that datasheet and think that with the current mode output it might make for a simple solution. analog has some comparators with ~1mV hysteresis and ECL,PECL or CML output just need to find one without onchip termination -Lasse
From: osr on 18 Feb 2010 18:33 Ok, the course test is to focus the beam in saline and see if it breaks down and creates plasma. I did find one 3 Ghz clipper-limiter on ebay, but it limits at 22 dbm, a little too high for this guy: Thorlabs FDS02 http://www.thorlabs.com/newGroupPage9.cfm?objectGroup_id=285. Now before somebody tells me to buy their mounted and biased one, I've used them before, and 2" of stripline, 1 choke, a 12V battery, and a switch is not my idea of a extra 100$. Mini Circuits, as far as limiters go, was NOT encouraging. So we're looking at counting, or current switching, or pulse stretching. As no good deed goes unpunished, I just got asked to build it. Hes a good friend, and so that request had only one possible answer... .. This oughta be fun... Steve
From: Joerg on 18 Feb 2010 20:47
osr(a)uakron.edu wrote: > Ok, the course test is to focus the beam in saline and see if it > breaks down and creates plasma. > > I did find one 3 Ghz clipper-limiter on ebay, but it limits at 22 dbm, > a little too high for this guy: > > Thorlabs FDS02 http://www.thorlabs.com/newGroupPage9.cfm?objectGroup_id=285. > I find their stuff to be rather high-price. > Now before somebody tells me to buy their mounted and biased one, I've > used them before, and 2" of stripline, 1 choke, a 12V battery, and a > switch is not my idea of a extra 100$. > :-) > Mini Circuits, as far as limiters go, was NOT encouraging. So we're > looking at counting, or current switching, or pulse stretching. > > As no good deed goes unpunished, I just got asked to build it. Hes a > good friend, and so that request had only one possible answer... > . > As Lasse mentioned Analog Devices offers good comparators. This thing ought to do the job, about $7 in small qty and Digikey has stock: http://www.analog.com/static/imported-files/data_sheets/ADCMP567.pdf Digikey P/N is: ADCMP567BCPZ-ND > This oughta be fun... > How many beers will he buy you? -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |