09-Op Amps 1 - Active Devices and Circuits I: Op-Amps Fred...

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Active Devices and Circuits I: Op-Amps © Fred Terry all, 2008 Fall, 2008 1
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Active Devices • Linearly Amplify Signals • Construction of Signal Processing Electronics ilt – Filters • Non-linear Functions – Digital Logic – Signal Multiplication (mixing) • We Will First Look at Operational Amplifiers p ps) (Op-amps) • Then We Will Take A Brief Look at Transistor Concepts 2
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Op Amps • An Op-Amp is an Electronic Device that Behaves Like a Voltage-Controlled Voltage Source • Early Use Included Analog Computing • Commonly Used for Audio to ~1 MHz Analog Signal Processing • Usually a ~30 Transistor/3-Stage Si Integrated Circuit (bipolar or CMOS) 3
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Op Amps: “Real” odel for Real Op mp +V CC V -,in R i - Model for Real Op-Amp V out V -,in V +,in +- - + + v d Av d R o V o -V CC Offset Null V +,in V offset i R < ∞ 0 offset V A < ∞ 4 0 o R >
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741 Op-Amp Circuit Diagram 5
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Ideal Op-Amp V -,in - V +,in - + + v d Av d V o 20 5 10 15 Vo A=1e5 Vo A=1e4 Vo A=5e3 Increasing Gain A i R →∞ -5 0 V o 0 offset V = -15 -10 6 0 o A R = -20 -6 -4 -2 0 2 4 6 V d (mV)
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This note was uploaded on 01/31/2011 for the course EECS 215 taught by Professor Phillips during the Spring '08 term at University of Michigan.

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09-Op Amps 1 - Active Devices and Circuits I: Op-Amps Fred...

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