On Tuesday, July 16, 2013 1:45:07 PM UTC-4, Michael Terrell wrote:> George Herold wrote: > > > > > > On Monday, July 15, 2013 8:35:22 PM UTC-4, bloggs.fred...@gmail.com wrote: > > > > On Monday, July 15, 2013 12:01:21 PM UTC-4, George Herold wrote: > > > > > > > > > Opamp Vsupply >36V> > > http://www.apexanalog.com/products/power-operational-amplifiers/Yeah I was going to add to the original thread that Apex opamp's need not apply :^) (too big and too expensive) There's that nice little LTC6090 that Fred Bartoli pointed to. (I should order some of them, to replace an Apex part.) George H.

# Opamp w/ Vsupply >36V

Started by ●July 15, 2013

Reply by ●July 17, 20132013-07-17

Reply by ●July 17, 20132013-07-17

On Tuesday, July 16, 2013 1:55:09 PM UTC-4, bloggs.fred...@gmail.com wrote:> On Tuesday, July 16, 2013 9:31:01 AM UTC-4, George Herold wrote: >=20 > > On Monday, July 15, 2013 8:35:22 PM UTC-4, bloggs.fred...@gmail.com wro=te:>=20 > >=20 >=20 > > > On Monday, July 15, 2013 12:01:21 PM UTC-4, George Herold wrote: >=20 > >=20 >=20 > > >=20 >=20 > >=20 >=20 > > > > Opamp Vsupply >36V >=20 > >=20 >=20 > > >=20 >=20 > >=20 >=20 > > > >=20 >=20 > >=20 >=20 > > >=20 >=20 > >=20 >=20 > > >=20 >=20 > >=20 >=20 > > >=20 >=20 > >=20 >=20 > > > Fix your power supply and use readily available, and commonly used, O=As.>=20 > >=20 >=20 > >=20 >=20 > >=20 >=20 > > Ahh, well there's nothing wrong with the supply. I just need 30V of st=able bias. The LM317's had too much drift and so I've now got a 10 Volt re= ference gained up to 30V. =20>=20 > >=20 >=20 > >=20 >=20 > >=20 >=20 > > George H. >=20 >=20 >=20 > Well what is this stuff about exceeding 36V??? Is it some kind of start-u=p overshoot? Well I'm not exceeding 36 V. Just feeling that the design is a bit tight..= 30 Volt out with ~2V of head room at the top and the minus supply 2V below= ground... And then worrying about the variation in parts. If I had, say 4= 0 V, then I could relax everything.=20 Not to worry I've got opamps ordered. I think the TLE2142 may be the winne= r. It's even got a bit less input C. George H.

Reply by ●July 18, 20132013-07-18

On 15/07/13 18.01, George Herold wrote:> Opamp Vsupply>36V > > Hi all, I�ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I�m a little worried. So I went looking for a similar opamp but with a bit more headroom. > So specs might read, > > Dual opamp > unity gain stable > 4(+) Mhz BW (8MHz or more would be nicer) > 10 V/us slew (again more is better) > 20mA current (positive, again more would be nicer) > small input C (<5pF would be nice.) > 8 pin dip preferred > > Trolling digikey I found a few possible candidates. > > TLE2142 (6 MHz GBW) > TLE2072 (only 38 V supply, 11 pF input C) > OPA2604 (nice but 10 pF input C) > (I�ll order a few of each.) > > There was also the LF412A, but a bit lacking is positive supply current. > > Any others that I might have missed? > > Thanks, > George H.Hi George Ask John Larkin if he can "dig" the schematic up again: https://groups.google.com/forum/?_escaped_fragment_=msg/sci.electronics.design/Q_w6eQEc3ec/-4XBtDF23xEJ#!msg/sci.electronics.design/Q_w6eQEc3ec/-4XBtDF23xEJ /Glenn

Reply by ●July 18, 20132013-07-18

On Thursday, July 18, 2013 3:45:31 AM UTC-4, Glenn wrote:> On 15/07/13 18.01, George Herold wrote: >=20 > > Opamp Vsupply>36V >=20 > > >=20 > > Hi all, I=92ve got a circuit with that uses an opa2134. I find myself=pushing the 36V supply limit and I=92m a little worried. So I went looki= ng for a similar opamp but with a bit more headroom.>=20 > > So specs might read, >=20 > > >=20 > > Dual opamp >=20 > > unity gain stable >=20 > > 4(+) Mhz BW (8MHz or more would be nicer) >=20 > > 10 V/us slew (again more is better) >=20 > > 20mA current (positive, again more would be nicer) >=20 > > small input C (<5pF would be nice.) >=20 > > 8 pin dip preferred >=20 > > >=20 > > Trolling digikey I found a few possible candidates. >=20 > > >=20 > > TLE2142 (6 MHz GBW) >=20 > > TLE2072 (only 38 V supply, 11 pF input C) >=20 > > OPA2604 (nice but 10 pF input C) >=20 > > (I=92ll order a few of each.) >=20 > > >=20 > > There was also the LF412A, but a bit lacking is positive supply current=.>=20 > > >=20 > > Any others that I might have missed? >=20 > > >=20 > > Thanks, >=20 > > George H. >=20 >=20 >=20 > Hi George >=20 >=20 >=20 > Ask John Larkin if he can "dig" the schematic up again: >=20 >=20 >=20 > https://groups.google.com/forum/?_escaped_fragment_=3Dmsg/sci.electronics=.design/Q_w6eQEc3ec/-4XBtDF23xEJ#!msg/sci.electronics.design/Q_w6eQEc3ec/-4= XBtDF23xEJ Hmm that link (whatever it is) doesn't work for me. But JL already posted a number of opamps. =20 George H.>=20 >=20 > /Glenn

Reply by ●July 18, 20132013-07-18

On 07/18/2013 09:07 AM, George Herold wrote:> On Thursday, July 18, 2013 3:45:31 AM UTC-4, Glenn wrote: >> On 15/07/13 18.01, George Herold wrote: >> >>> Opamp Vsupply>36V >> >>> >> >>> Hi all, I�ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I�m a little worried. So I went looking for a similar opamp but with a bit more headroom. >> >>> So specs might read, >> >>> >> >>> Dual opamp >> >>> unity gain stable >> >>> 4(+) Mhz BW (8MHz or more would be nicer) >> >>> 10 V/us slew (again more is better) >> >>> 20mA current (positive, again more would be nicer) >> >>> small input C (<5pF would be nice.) >> >>> 8 pin dip preferred >> >>> >> >>> Trolling digikey I found a few possible candidates. >> >>> >> >>> TLE2142 (6 MHz GBW) >> >>> TLE2072 (only 38 V supply, 11 pF input C) >> >>> OPA2604 (nice but 10 pF input C) >> >>> (I�ll order a few of each.) >> >>> >> >>> There was also the LF412A, but a bit lacking is positive supply current.. >> >>> >> >>> Any others that I might have missed? >> >>> >> >>> Thanks, >> >>> George H. >> >> >> >> Hi George >> >> >> >> Ask John Larkin if he can "dig" the schematic up again: >> >> >> >> https://groups.google.com/forum/?_escaped_fragment_=msg/sci.electronics..design/Q_w6eQEc3ec/-4XBtDF23xEJ#!msg/sci.electronics.design/Q_w6eQEc3ec/-4XBtDF23xEJ > > Hmm that link (whatever it is) doesn't work for me. > But JL already posted a number of opamps. > George H. >I think it was John's photo-MOS totem pole idea. 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

Reply by ●July 18, 20132013-07-18

On Thu, 18 Jul 2013 06:07:28 -0700 (PDT), George Herold <gherold@teachspin.com> wrote:>On Thursday, July 18, 2013 3:45:31 AM UTC-4, Glenn wrote: >> On 15/07/13 18.01, George Herold wrote: >> >> > Opamp Vsupply>36V >> >> > >> >> > Hi all, I�ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I�m a little worried. So I went looking for a similar opamp but with a bit more headroom. >> >> > So specs might read, >> >> > >> >> > Dual opamp >> >> > unity gain stable >> >> > 4(+) Mhz BW (8MHz or more would be nicer) >> >> > 10 V/us slew (again more is better) >> >> > 20mA current (positive, again more would be nicer) >> >> > small input C (<5pF would be nice.) >> >> > 8 pin dip preferred >> >> > >> >> > Trolling digikey I found a few possible candidates. >> >> > >> >> > TLE2142 (6 MHz GBW) >> >> > TLE2072 (only 38 V supply, 11 pF input C) >> >> > OPA2604 (nice but 10 pF input C) >> >> > (I�ll order a few of each.) >> >> > >> >> > There was also the LF412A, but a bit lacking is positive supply current. >> >> > >> >> > Any others that I might have missed? >> >> > >> >> > Thanks, >> >> > George H. >> >> >> >> Hi George >> >> >> >> Ask John Larkin if he can "dig" the schematic up again: >> >> >> >> https://groups.google.com/forum/?_escaped_fragment_=msg/sci.electronics.design/Q_w6eQEc3ec/-4XBtDF23xEJ#!msg/sci.electronics.design/Q_w6eQEc3ec/-4XBtDF23xEJ > >Hmm that link (whatever it is) doesn't work for me. >But JL already posted a number of opamps. >George H. > >> >> >> /GlennThe FTP thing didn't work well, so I'm using Dropbox now. Here's the HV amp idea: https://dl.dropboxusercontent.com/u/53724080/Circuits/Optos/HVamp.JPG I actually did it once, for the atom probe project, and it worked fine. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

Reply by ●July 18, 20132013-07-18

John Larkin wrote:> > The FTP thing didn't work well, so I'm using Dropbox now. Here's the > HV amp idea: > > https://dl.dropboxusercontent.com/u/53724080/Circuits/Optos/HVamp.JPG > > I actually did it once, for the atom probe project, and it worked > fine.What do you do with FB? -- Reply in group, but if emailing remove the last word.

Reply by ●July 18, 20132013-07-18

On Thu, 18 Jul 2013 12:43:12 -0400, "Tom Del Rosso" <tomd_u1@verizon.net.invalid> wrote:> >John Larkin wrote: >> >> The FTP thing didn't work well, so I'm using Dropbox now. Here's the >> HV amp idea: >> >> https://dl.dropboxusercontent.com/u/53724080/Circuits/Optos/HVamp.JPG >> >> I actually did it once, for the atom probe project, and it worked >> fine. > >What do you do with FB?Whatever you like. What you do with feedback is application dependant. Oh, those optos really deserve b-e resistors. That reduces CTR but increases speed and breakdown voltage. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

Reply by ●July 18, 20132013-07-18

John Larkin wrote:> On Thu, 18 Jul 2013 12:43:12 -0400, "Tom Del Rosso" > <tomd_u1@verizon.net.invalid> wrote: > > > > > John Larkin wrote: > > > > > > The FTP thing didn't work well, so I'm using Dropbox now. Here's > > > the HV amp idea: > > > > > > https://dl.dropboxusercontent.com/u/53724080/Circuits/Optos/HVamp.JPG > > > > > > I actually did it once, for the atom probe project, and it worked > > > fine. > > > > What do you do with FB? > > Whatever you like. What you do with feedback is application dependant.Of course, but how? You must have had an equally clever way to isolate it. -- Reply in group, but if emailing remove the last word.

Reply by ●July 18, 20132013-07-18

On Thu, 18 Jul 2013 14:20:56 -0400, "Tom Del Rosso" <tomd_u1@verizon.net.invalid> wrote:> >John Larkin wrote: >> On Thu, 18 Jul 2013 12:43:12 -0400, "Tom Del Rosso" >> <tomd_u1@verizon.net.invalid> wrote: >> >> > >> > John Larkin wrote: >> > > >> > > The FTP thing didn't work well, so I'm using Dropbox now. Here's >> > > the HV amp idea: >> > > >> > > https://dl.dropboxusercontent.com/u/53724080/Circuits/Optos/HVamp.JPG >> > > >> > > I actually did it once, for the atom probe project, and it worked >> > > fine. >> > >> > What do you do with FB? >> >> Whatever you like. What you do with feedback is application dependant. > >Of course, but how? You must have had an equally clever way to isolate it.Flooby Dust ?:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 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.