I need to test a series connection of 3 amplifiers for stability. Is it enough to verify that each of them is stable by itself?
Thank you in advance,
Let's say you have one op amp hooked up closed loop w/ 60 degrees phase margin and is stable.
You will have phase shift that varies as a function of frequency. Now connect three of these blocks
in cascade. The chain will be stable. BUT if you close the loop around all three, you cannot
guarantee it will be stable. Suggest you talk further with your local FAE rather than posting
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