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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. + - vin ocoutv ideal R2 R1 v- v+ Feed-back Path Feed-forward Path Closed -Loop 2/13/2011 Closed and Open Loop Gain lecture 3/5 Jim Stiles The Univ.

* The closed-loop gain is determined by two resistor values, which typically are selected to provide significant gain (A vo >1), albeit not so large that the amplifier is easily saturated. * Conversely, the open-loop gain (-A op) obviously does involve the op-amp gain. Moreover, as in this case, the open-loop gain of a feedback amplifier

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