Electronics > Projects, Designs, and Technical Stuff
How can I obtain amplifier circuit loop gain?
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Lucky-Luka:
I don't understand why you need to block AC
Wimberleytech:

--- Quote from: Lucky-Luka on January 17, 2020, 12:17:06 pm ---I don't understand why you need to block AC

--- End quote ---

Because you want to OPEN the loop for frequencies of interest (everything above the nano Hz range, e.g., as magic said).

mikerj:

--- Quote from: Lucky-Luka on January 17, 2020, 12:17:06 pm ---I don't understand why you need to block AC

--- End quote ---

The whole idea is to remove the feedback at AC to measure open-loop gain/phase, but retain DC feedback to set the correct operating conditions.  If you don't block AC then you are providing negative feedback and therefore won't be measuring open-loop gain. 
Lucky-Luka:
1)Before stating that my request is fundamentally wrong I think you should read my question more carefully Lesolee. Haven't you read the anwers I received?
2)The video was to meant to point out what the loop gain is, since another user didn't know it.

Thanks everybody for the answers.

p.s. LOL. Lesolee's post misteriously disappeared after my reply.
bson:
Vf/Vin, where Vf is the feedback voltage.
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