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how to affirm that the cmfb circuit is stablilty?

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wjxcom

wjxcom

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Hi all: I designed a full differential opa shown in the file opa.jpg, and I designed a cmfb circuit shown in the file cmfb.jpg too.

Though I have already analyse the AC character of this opa, I do not know how to test the stability of the cmfb circuit, who can help me?

thanx!!!
 

thanx all: I have already know how to affirm the stability of a cmfb circuit. this is the simulation circuit!
 

wjxcom said:
thanx all: I have already know how to affirm the stability of a cmfb circuit. this is the simulation circuit!
Click to expand...

Can you explain it? thanx
I guess test the GBW of the and phrase margin of the cmfb will help.
 

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