# Lecture 21 - L isolates them, and v L does not depend upon...

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Lecture 21 figures 1 Fig. 21-1: An operational amplifier. The voltage at the inverting input, non-inverting input and output is v - , v + , and v o , respectively. v i is the voltage difference between the inputs, v i = v - - v + . Fig. 21-2: The dependent source model of the operational amplifier. The op amp senses the voltage difference at the inputs, v i , and produces a proportional output voltage v o = -A v i . Fig. 21-3: An op amp used as a voltage follower. Fig. 21-4: The dependent source model of an op amp used as a voltage follower.

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Lecture 21 figures 2 Fig. 21-5: A voltage follower acts as a buffer between the practical voltage source and the load resistor R L . In (a), the value of R L affects v L . In (b), the voltage follower inserted between the practical source and R
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Unformatted text preview: L isolates them, and v L does not depend upon R L . (a) (b) Fig. 21-6: An op amp used as an inverting amplifier. On the right, we show the dependent source model of an inverting amplifier. Fig. 21-8: A voltage divider with an inverting amplifier used to convert the 15 V to 5V. Fig. 21-7: A voltage divider used to step the voltage down from 15 V to 7.5V. Lecture 21 figures 3 Fig. 21-9: A resistive divider and inverting op amp circuit with a voltage follower inserted between. Fig. 21-10: A current-to-voltage converter. Fig. 21-12: The dependent source model of an op amp in a non- inverting amplifier circuit. Fig. 21-11: An op amp in a non- inverting amplifier configuration....
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## This note was uploaded on 01/19/2012 for the course IE 230 taught by Professor Xangi during the Spring '08 term at Purdue University-West Lafayette.

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Lecture 21 - L isolates them, and v L does not depend upon...

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