Monday 5 February 2018

operational amplifier - What is the purpose of a resistor in the feedback path of a unity gain buffer?


I often see unity-gain followers with a resistor in the feedback path. For an ideal op-amp, of course, there is no current into the input, and this resistor does nothing. What is its effect with a real op-amp, and how do I choose its value?


Unity-Gain follower with feedback resistor


What does R1 do in this circuit?




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