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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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





_

i(-)

Inverting

RO

A

vid

Output

Ri

vO = Advid

Noninverting

i(+)

+

-VS

The Ideal OP-AMP

Open-loop gain

Exercise 2.2


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.


Analysis of Circuits Containing Ideal OP-AMPS

The Closed-Loop Gain

-

Analysis of the inverting configuration


Analysis of Circuits Containing Ideal OP-AMPS

Effect of Finite Open-Loop Gain








Other Applications of the Inverting Configuration

The Differentiator

Z2 = R

Z1 = 1/sC



Other Applications of the Inverting Configuration

The Non-Inverting Configuration

vi



Other Applications of the Inverting Configuration

The Difference Amplifier

A difference amplifier.


Other Applications of the Inverting Configuration

The Difference Amplifier

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


Other Applications of the Inverting Configuration

The Difference Amplifier – Input Resistances

Finding the input resistance of the difference amplifier.


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.


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.


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


(a) Performance 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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