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Closed and Open Loop Gain lecture - ITTC

2/13/2011 Closed and open Loop Gain lecture 1/5 Jim Stiles The Univ. of Kansas Dept. of EECS Closed -Loop and open -Loop Gain Consider the inverting amplifier a feedback amplifier constructed with an op-amp: The open - circuit voltage gain of this amplifier: 21voRAR = is also referred to by engineers the Closed loop gain of the feedback amplifier. + - vin ocoutv ideal R2 R1 v- v+ 2/13/2011 Closed and open Loop Gain lecture 2/5 Jim Stiles The Univ. of Kansas Dept. of EECS A Closed loop Q: Closed loop? What does that mean? A: The term Closed loop refers to loop formed by the feed-forward path and the feed-back ( , feedback) path of the amplifier. In this case, the feed-forward path is formed by the op-amp, while the feed-back path is formed by the feedback resistor R2.

which of course is the open-circuit voltage gain of this inverting amplifier. i 1 i 2 + v in - oc out ideal v R 2 R 1 v-v + 2/13/2011 Closed and Open Loop Gain lecture 5/5 Jim Stiles The Univ. of Kansas Dept. of EECS Feedback is a wonderful thing Note that the closed-loop gain (21

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