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Chapter 2 – Operational Amplifiers

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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. The OP-AMP Terminals. Symbol Power Supplies.

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slide1

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

slide2

The OP-AMP Terminals

Symbol

Power Supplies

slide6

_

i(-)

Inverting

RO

A

vid

Output

Ri

vO = Advid

Noninverting

i(+)

+

-VS

The Ideal OP-AMP

Open-loop gain

Exercise 2.2

slide7

Analysis of Circuits Containing Ideal OP-AMPS

The Inverting Configuration

Closed-Loop Gain

Virtual Short-Circuit

Virtual Ground

Negative and Positive Feedback

The inverting closed-loop configuration.

slide8

Analysis of Circuits Containing Ideal OP-AMPS

The Closed-Loop Gain

-

Analysis of the inverting configuration

slide9

Analysis of Circuits Containing Ideal OP-AMPS

Effect of Finite Open-Loop Gain

slide20

Other Applications of the Inverting Configuration

The Difference Amplifier

A difference amplifier.

slide21

Other Applications of the Inverting Configuration

The Difference Amplifier

Applications of superposition to the analysis of the current circuit of Fig.. 2.21.

slide22

Other Applications of the Inverting Configuration

The Difference Amplifier – Input Resistances

Finding the input resistance of the difference amplifier.

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Other Applications of the Inverting Configuration

The Difference Amplifier – Common-Mode and Differential

Components of the input signal

Representation of the common-mode and differential components of the input signal to a difference amplifier. Note that v1 = vCM - vd/2 and v2 = vCM + vd/2.

slide24

Other Applications of the Inverting Configuration

Instrumentation Amplifier

(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, R1 is implemented as the series combination of a fixed resister R1fand a variable resistor R1v. Resistor R1fensures that the maximum available gain is limited.

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Effect Of Finite Open-Loop Gain and Bandwidth On Circuit Performance

Open-loop gain of a typical general-purpose internally compensated op amp.

fb = 3-db or break frequency

ft = unity gain bandwidth

slide26

(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 (wtV) is smaller then or equal to SR.

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