Saturday, 12 March 2016

operational amplifier - Op Amp & Feedback



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Hi,


I'm studying op amp and it feedback to control the gain. I do not understand how we can go from looking at the circuit of the op amp and determine the beta values. How did the term B (beta) equal to the voltage divider (R1/R2+R1)? Sf or Vf, how did they redraw the op amp circuit or the feedback block diagram into an voltage divider??




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