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Dual feedback design via TI amp

Hi team,

 

Now I need to design a dual feedback circuit with Amplifier of TI. After I learned the dual feeback theory in precision lab, I met some problem and I need your advice.

  1. In the precision lab- stability 6, I can’t see any specific calculation about the Cf.
  2. When I refer to other document about the dual feedback, I found that the calculation of the Cf and Riso is different from the precision lab video in TI, which is shown below.
  3. In the other document in the internet, I found that the author divide the calculation into 2 case. Why does the author divide the calculation into 2 case? Do you have any other document which explain loop analysis of the dual feedback theory more specifically?

        

     

 

Best Regards

Wesley Huang