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Chapter 2 – Operational Amplifiers Introduction http://engr.calvin.edu/PRibeiro_WEBPAGE/courses/engr311/Handouts/OpAmp-tutorial-1.ppt Textbook CD http://www.clarkson.edu/%7Esvoboda/eta/designLab/InvertingAmplifierDesign.html

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The OP-AMP Terminals Symbol Power Supplies

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Fairchild uA702 – The first op-amp designed by Bob Widlar

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The OP-AMP Terminals

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The Ideal OP-AMP -V S v id Inverting Noninverting Output + _ i (-) i (+) v O = A d v id RORORORO A RiRiRiRi Open-loop gain Exercise 2.2

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Analysis of Circuits Containing Ideal OP-AMPS The Inverting Configuration The inverting closed-loop configuration. Closed-Loop Gain Virtual Short-Circuit Virtual Ground Negative and Positive Feedback

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Analysis of Circuits Containing Ideal OP-AMPS The Closed-Loop Gain Analysis of the inverting configuration -

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Analysis of Circuits Containing Ideal OP-AMPS Effect of Finite Open-Loop Gain

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Analysis of Circuits Containing Ideal OP-AMPS Exercise 2.1

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Analysis of Circuits Containing Ideal OP-AMPS Input and Output Resistances

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Analysis of Circuits Containing Ideal OP-AMPS Exercise 2.2

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Other Applications of the Inverting Configuration With General Impedances Z1 Z2

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Other Applications of the Inverting Configuration The Integrator

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Other Applications of the Inverting Configuration PSpice Simulation Tips

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Other Applications of the Inverting Configuration The Differentiator Z1 = 1/sC Z2 = R

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Other Applications of the Inverting Configuration The Weighted Summer

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Other Applications of the Inverting Configuration The Non-Inverting Configuration vivi

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Other Applications of the Inverting Configuration The Voltage Follower

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A difference amplifier. Other Applications of the Inverting Configuration The Difference Amplifier

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Applications of superposition to the analysis of the current circuit of Fig.. 2.21. Other Applications of the Inverting Configuration The Difference Amplifier

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Finding the input resistance of the difference amplifier. Other Applications of the Inverting Configuration The Difference Amplifier – Input Resistances

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Representation of the common-mode and differential components of the input signal to a difference amplifier. Note that v 1 = v CM - v d /2 and v 2 = v CM + v d /2. Other Applications of the Inverting Configuration The Difference Amplifier – Common-Mode and Differential Components of the input signal

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(a) A popular circuit for an instrumentation amplifier. (b) Analysis of the circuit in (a) assuming ideal op-amps. (c) To make the gain variable, R 1 is implemented as the series combination of a fixed resister R 1f and a variable resistor R 1v. Resistor R 1f ensures that the maximum available gain is limited. Other Applications of the Inverting Configuration Instrumentation Amplifier

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Open-loop gain of a typical general-purpose internally compensated op amp. Effect Of Finite Open-Loop Gain and Bandwidth On Circuit Performance fb = 3-db or break frequency ft = unity gain bandwidth

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(a) Unity-gain follower. (b) Input step waveform. (c) Linearly rising output waveform obtained when the amplifier is slew-rate limited. (d) Exponentially rising output waveform obtained when V is sufficiently small so that the initial slope (w t V) is smaller then or equal to SR.

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Effect of slew-rate limiting on output sinusoidal waveforms.

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