Forums

Opamp w/ Vsupply >36V

Started by George Herold July 15, 2013
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.
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.
On 15/07/13 18.01, George Herold wrote:
> Opamp Vsupply>36V > > Hi all, I&#2013266066;ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I&#2013266066;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&#2013266066;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
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
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&#2013266066;ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I&#2013266066;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&#2013266066;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
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&#2013266066;ve got a circuit with that uses an opa2134. I find myself pushing the 36V supply limit and I&#2013266066;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&#2013266066;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. > >> >> >> /Glenn
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. -- 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
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.
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
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.
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.