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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.

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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?

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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.

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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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