Op amp introduction

# Op amp introduction - Operational Amplifiers and Active Filters An operational amplifier(op amp is an integrated circuit comprised of transistors

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Operational Amplifiers and Active Filters An operational amplifier (op amp) is an integrated circuit comprised of transistors and resistors that can be used to increase the strength (amplify) or filter an input signal. The symbol used for an op amp in the schematic diagram of an electronic circuit is as follows: The equivalent electrical circuit for the op amp is given by: R in and R out are, respectively, the op amp s input and output resistances , and A is the open-loop gain . All voltages are referenced to the ground node. Output signal V out V R in V + + A( V + V ) R out V out Signal inputs : V (inverting input) V + (non-inverting input) voltage-controlled voltage source

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Now, consider what is probably the most basic connection of the op amp, the inverting amplifier . We want to obtain V out in terms of V in . Observing that there are only two unknown node voltages, V out and V , we can write a pair of node equations to solve the problem: V R in V + = 0 + A( V + V ) R out V out V V + = 0 V out R 1 R 2 V in R 1 V in R 2 R load R load
At V : V ! ! V

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## This note was uploaded on 04/17/2008 for the course EECS 202 taught by Professor Plonus during the Spring '08 term at Northwestern.

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Op amp introduction - Operational Amplifiers and Active Filters An operational amplifier(op amp is an integrated circuit comprised of transistors

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