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[SOLVED] buffer amplifier - phase

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greenjuice

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to make analog amplifer, I connect negative feedback and phase shift of amplifier should be below 180 when amp gain is unity gain because if not, output of amp is larger more and more or oscillated.

But when that conditions are satisfied, how can i prove that amplifier is not oscillated?

for example, at specific frequency, when gain is 1400 and phase shift is just 80, amplfier is not oscillated? i want to know whether amplifier is not oscillated. if it is possible, mathematically.
 

I believe the question has been already discussed (and basically answered) in your previous thread
https://www.edaboard.com/threads/344386/

If the loop gain curve crosses unity only once, the phase margin (distance to 180 degree phase shift at unity loop gain) gives sufficient stability information.

There are many previous Edaboard threads related to the topic, it's also widely discussed in analog circuit design text books and OP application literature.

https://www.edaboard.com/threads/303438/
https://www.edaboard.com/threads/97200/
 

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