Hello, I'm studying Negative Feedback of OPAMP, but I can't figure out how to calculate loop gain \( A\beta \). I know that it is necessary to break loop and use test generator, but I don't know exactly how it is done. Any suggestion?

 

http://www.ti.com/lit/ml/sloa075/sloa075.pdf

 

http://forum.allaboutcircuits.com/threads/creating-a-voltage-feedback-amplifier.115392/#post-900653
http://forum.allaboutcircuits.com/threads/gain-bandwidth-product-for-error-amplifier.96538/#post-719757
http://forum.allaboutcircuits.com/threads/negative-feedback-and-impedance.98077/#post-732282
http://forum.allaboutcircuits.com/threads/schematic-analysis-for-voltage-drops.85763/page-3#post-616893