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Groups > sci.electronics.design > #446720
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Difference Amp. |
| Date | 2017-02-07 17:40 -0800 |
| Organization | Rowland Institute |
| Message-ID | <o7dsuk01h6k@drn.newsguy.com> (permalink) |
| References | <a0ba2179-d6c6-4165-b751-60d6d2281f22@googlegroups.com> <kgsk9cdvd13o0vpfa7ocbub4r30lsn4hvg@4ax.com> |
John Larkin wrote...
>
>> Hmm that might be my only question. Would you
>> use these instead of an opamp and 0.1% R's?
>
> A difference amp, with tracking laser-trimmed
> resistors inside, is fairly cheap.
Right. These parts aren't going to disappear.
Most of the popular versions shown in our 1989
2nd edition are still going strong, and will
for decades to come.
> One cool part is AD8130, 270 MHz, interesting
> architecture.
The high-frequency gain and good CMRR is nice, but
since it uses the cancellation of two differential
BJT g_m stages as its input, it isn't a precision
part, like a fine op-amp + 0.01% matched resistors.
--
Thanks,
- Win
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Difference Amp. George Herold <gherold@teachspin.com> - 2017-02-07 12:56 -0800
Re: Difference Amp. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-07 16:40 -0500
Re: Difference Amp. gghero27@gmail.com - 2017-02-07 17:47 -0800
Re: Difference Amp. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 11:45 -0500
Re: Difference Amp. George Herold <gherold@teachspin.com> - 2017-02-08 10:58 -0800
Re: Difference Amp. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 12:20 -0700
Re: Difference Amp. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 12:34 -0700
Re: Difference Amp. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 16:09 -0500
Re: Difference Amp. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 14:12 -0700
Re: Difference Amp. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 16:15 -0500
Re: Difference Amp. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 14:21 -0700
Re: Difference Amp. George Herold <gherold@teachspin.com> - 2017-02-08 16:28 -0800
Re: Difference Amp. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 16:08 -0500
Re: Difference Amp. gghero27@gmail.com - 2017-02-07 17:47 -0800
Re: Difference Amp. sdy <sdeyoreo@hotmail.com> - 2017-02-07 16:20 -0800
Re: Difference Amp. gghero27@gmail.com - 2017-02-07 17:50 -0800
Re: Difference Amp. John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-08 12:45 -0800
Re: Difference Amp. John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-07 17:22 -0800
Re: Difference Amp. Winfield Hill <hill@rowland.harvard.edu> - 2017-02-07 17:40 -0800
Re: Difference Amp. Robert Latest <boblatest@yahoo.com> - 2017-02-08 18:10 +0000
Re: Difference Amp. Winfield Hill <hill@rowland.harvard.edu> - 2017-02-08 12:06 -0800
Re: Difference Amp. Robert Latest <boblatest@yahoo.com> - 2017-02-09 17:55 +0000
Re: Difference Amp. Kamen Lilov <kamenl@gmail.com> - 2017-02-08 11:25 -0800
Re: Difference Amp. George Herold <gherold@teachspin.com> - 2017-02-08 12:41 -0800
Re: Difference Amp. George Herold <gherold@teachspin.com> - 2017-02-08 12:47 -0800
Re: Difference Amp. krw@notreal.com - 2017-02-08 20:43 -0500
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