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Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by George Herold May 14, 2015
On Thursday, May 14, 2015 at 3:06:27 PM UTC-4, John Larkin wrote:
> On Thu, 14 May 2015 10:04:27 -0700 (PDT), Felipe Jimenez > <felipe.m.jimenez@gmail.com> wrote: > > >On Thursday, May 14, 2015 at 9:28:05 AM UTC-7, John Larkin wrote: > >> On Thu, 14 May 2015 09:15:53 -0700 (PDT), George Herold > >> <gherold@teachspin.com> wrote: > >> > >> >On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > >> >> On 05/14/2015 11:50 AM, John Larkin wrote: > >> >> > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > >> >> > <pcdhobbs@gmail.com> wrote: > >> >> > > >> >> >>> Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > >> >> >>> switching back and forth from the non-inverting to the inverting configuration > >> >> >>> several times, I am fairly certain that both configurations were wired up properly. > >> >> >> > >> >> >> Hmm... "several times" does make it sound like a solderless breadboard, as John suggested. Those things are slabs of misery, for sure. > >> >> > > >> >> > Someone deserves an IgNobel prize for inventing them. > >> >> > >> >> They work okay for making a PIC blink a LED, as long as they're new. > >> >> > >> >> Then of course somebody plugs in a resistor from an old reel without > >> >> removing the residual adhesive, and two of the holes become flaky > >> >> forever. Then the next resistor is maybe oversize, and bends the crappy > >> >> metal fingers apart, and the one after that is corroded, and leaves > >> >> semi-insulating dust all over the place.... > >> >> > >> >> Not to mention a couple of pF of capacitance between adjacent rows, and > >> >> many nanohenries in series with all the (nastily daisy chained) grounds. > >> >> > >> >> Cheers > >> >> > >> >> Phil Hobbs > >> >> > >> >> > >> >> -- > >> >> Dr Philip C D Hobbs > >> >> Principal Consultant > >> >> ElectroOptical Innovations LLC > >> >> Optics, Electro-optics, Photonics, Analog Electronics > >> >> > >> >> 160 North State Road #203 > >> >> Briarcliff Manor NY 10510 > >> >> > >> >> hobbs at electrooptical dot net > >> >> http://electrooptical.net > >> > > >> >Grin, I was laying out this little pressure circuit for testing the other day, > >> >a few flaky connections later and I grabbed my soldering iron and copper clad. > >> > > >> >I need to order more (copper clad) any decent sources? > >> > > >> >George H. > >> > >> ebay usually has tons. Or I can send you a few sheets. I might even > >> include a bit of the gold stuff. > >> > >> https://dl.dropboxusercontent.com/u/53724080/Protos/Z356_EOM_Timer/Z356_Top.JPG > >> > >> https://dl.dropboxusercontent.com/u/53724080/Protos/Z338_PCB.JPG > >> > >> https://dl.dropboxusercontent.com/u/53724080/Protos/D200_BB_4.JPG > >> > >> > >> > >> > >> > >> -- > >> > >> John Larkin Highland Technology, Inc > >> picosecond timing laser drivers and controllers > >> > >> jlarkin att highlandtechnology dott com > >> http://www.highlandtechnology.com > > > >Hey John...I'm always looking to improve my prototyping skills...What do you use to cut away your copper on your prototypes? I just use a razor and slice back and forth, but then I may create shorts when I fill that part with solder. I see your prototypes have a pretty good clearance when cutting away the copper to make isolated pads. > > Lately I use a Dremel with a carbide dental burr. It takes a bit of > practice. Finish off with x-acto trim and a healthy rub with > Scotchbrite. > > https://dl.dropboxusercontent.com/u/53724080/Protos/Burr_1.JPG > > https://dl.dropboxusercontent.com/u/53724080/Protos/Burr_2.JPG > > You can also mount parts on insulated pedestals of FR4. I use krazy > glue, recommeded by Dr Phil. > > https://dl.dropboxusercontent.com/u/53724080/Protos/LDP1.jpg > > https://dl.dropboxusercontent.com/u/53724080/Protos/LDP2.JPG >
"
> Sadly, the beautiful copper prototypes get grungy in a few weeks. > That's why I had some FR4 gold plated.
" Some copper clad goes bad right away, I've got other pieces I've used again and again, No finger prints, no nothing. (And I'm a known finger print guy, I leave hand prints all over the machine shop... too much garlic or onion, or something.) George H.
> > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com