# Lab10 - Vout UNIVERSITY OF MIAMI Department of Electrical...

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Vout UNIVERSITY OF MIAMI Department of Electrical and Computer Engineering EEN 204 Name: _______________________ Section: _______________________ Date: _______________________ OPERATIONAL AMPLIFIERS / PART I Purpose The purpose of this experiment is to demonstrate some basic operational amplifier circuits, namely the inverting, summing, and non-inverting amplifiers as well as the voltage follower. All these circuits operate in the closed-loop mode. The inverting amplifier’s closed loop voltage gain can be less than, equal to or greater than one. Its output signal is always inverted with respect to its input signal, as the name implies. On the other hand, the non-inverting amplifier’s closed loop voltage gain is always greater than one, while its input and output signals are in phase. The summing amplifier, as the name implies, is used to obtain the algebraic sum of multiple inputs. Each input can be weighed by different gain factors. The voltage follower acts as a buffer with high input and low output impedances. Background The operational-amplifier is probably the most frequently used linear integrated circuit available. This device exhibits various desirable characteristics. Open-loop characteristics refer to those of an amplifier having no feedback elements between output and input. Closed-loop characteristics are those of an amplifier having an external feedback element or group of elements. When an element (i.e., a resistor, capacitor, inductor, etc) is connected from one of the input terminals to the output terminal, it will

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## This note was uploaded on 06/26/2010 for the course EEN 204 204 taught by Professor Lang during the Fall '09 term at Miami University.

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Lab10 - Vout UNIVERSITY OF MIAMI Department of Electrical...

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