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# Chapter 2 – Operational Amplifiers - PowerPoint PPT Presentation

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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Presentation Transcript

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

Symbol

Power Supplies

i(-)

Inverting

RO

A

vid

Output

Ri

Noninverting

i(+)

+

-VS

The Ideal OP-AMP

Open-loop gain

Exercise 2.2

The Inverting Configuration

Closed-Loop Gain

Virtual Short-Circuit

Virtual Ground

Negative and Positive Feedback

The inverting closed-loop configuration.

The Closed-Loop Gain

-

Analysis of the inverting configuration

Effect of Finite Open-Loop Gain

Exercise 2.1

Input and Output Resistances

Exercise 2.2

With General Impedances

Z2

Z1

The Integrator

PSpice Simulation Tips

The Differentiator

Z2 = R

Z1 = 1/sC

The Weighted Summer

The Non-Inverting Configuration

vi

The Voltage Follower

The Difference Amplifier

A difference amplifier.

The Difference Amplifier

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

The Difference Amplifier – Input Resistances

Finding the input resistance of the difference amplifier.

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.

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.

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.