Negative Feedback Amplifier

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Hi My Friends,

I'm currently developing a class D amplifier Power of High and low impedance output, currently working with fixed oscillator and power is not symmetric.
My problem in this part of the calculus of feedback, I am very interested in learning even have a document that explains short, but in an interesting way, however I could not calculate the formulas, I would like if possible to help me calculate to work together.

http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf

My electric scheme would practically Scheme Page 4 of Figure 6.

I count on your help.

Hugs to all.
Cleber
 
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