From: spam@spam.com   
      
   On Tue, 13 Sep 2011 12:08:14 -0500, John Byrns    
   wrote:   
      
   >> >So if I follow you, you are not talking about a single overall negative   
   >> >feedback   
   >> >loop containing a dominant pole within, but instead you are talking about   
   >> >nested   
   >> >feedback loops where the dominant pole within the overall feedback loop is   
   >> >created by a second shorter internal feedback loop that rolls off the high   
   >> >frequencies?   
   >>   
   >> That is exactly what a dominant pole is - a nested feedback system in   
   >> which the voltage amplifier is controlled by a single capacitive   
   >> feedback element. The overall feedback which surrounds it is flat, and   
   >> composed of two resistors, the ratio of which sets the gain of the   
   >> amplifier.   
   >   
   >I beg to differ, a "dominant pole" does not require nested feedback loops, it   
   >can also be a simple pole within a single overall feedback loop controlled by   
   >the same two resistors you describe.   
      
   Oh jeez. OK. But the way it is done 99%, no, 100% of the time is by   
   putting the pole around the voltage amplifier. That way the dominant   
   pole reduces the voltage amplifier distortion at high frequencies. If   
   you just stick in a pole it can't. Why would anyone compromise their   
   HF open loop gain for nothing?   
      
   d   
      
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