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| Unity gain amplifier stability |
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| Wimberleytech:
--- Quote from: rstofer on February 11, 2020, 10:37:09 pm --- --- Quote from: Wimberleytech on February 11, 2020, 01:38:22 pm --- --- Quote from: Wimberleytech on February 11, 2020, 11:59:20 am --- I have a great set of lecture notes from, uh, 40+ years ago. I will scan them and post later. --- End quote --- Here they are: http://www.wimberleytech.com/techblog/wp-content/uploads/2020/02/Second-order-systems-and-compensation_opt.pdf --- End quote --- Thanks for the notes. They clearly point out why I walked away from analog and focused on digital in college. --- End quote --- LOL...and I have always been amazed by the digital guys...its a dance: analog--digital "mixed signal!" |
| exe:
A few mandatory pics. PS I'm a "digital" arduino guy because I'm a software engineer at my real job. Want to learn some analog, but feedback loops drive me crazy. |
| ricko_uk:
Thank you all for the infos! :) |
| Vovk_Z:
--- Quote from: ricko_uk on February 10, 2020, 09:27:56 pm ---1) make sure an op-amp is unity gain stable (i.e. to use just as buffer) at a certain frequency and certain amplitude if it does not say "unity gain stable" in the datasheet? --- End quote --- Usually if it isn't unity gain stable - it will be in the datasheet. So if there isn't such info - that it have to mean that it is "usual" = "unity gain stable" opamp. But situation changes if there is something else in opamp feedback loop - any device (even long wires) change (worsen) it's stability. |
| SiliconWizard:
--- Quote from: Vovk_Z on February 12, 2020, 02:35:25 pm ---(...) But situation changes if there is something else in opamp feedback loop - any device (even long wires) change (worsen) it's stability. --- End quote --- Of course. Then again, if there's anything in the feedback loop, we may argue that you won't get unity gain, strictly speaking. |
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