Chapter 14Operational Amplifiers

741 Operational Amplifier

IntroductionOperational Amplifiers are

integrated circuits (IC’s) that have a number of advantages over the standalone transistors.

Circuit Symbol and IC Pinouts

741 Operational Amplifier

Ideal Op-Amp (page 664)1. The circuitry of an operational amplifier

with a closed, negative-feedback loop will adjust its output in any way possible to make the inverting input and non-inverting input terminals of the device equal in voltage.

2. Infinite Input Impedance The inputs draw no current.

Inverting Amplifier

How does Vout depend in Vin?

Is there a phase shift between Vout and Vin?

Non-Inverting Amplifier

How does Vout depend in Vin?

Is there a phase shift between Vout and Vin?

Voltage Follower

How does Vout depend in Vin?

Is there a phase shift between Vout and Vin?

Example ProblemsSketch the Equivalent Circuit and Find the Gain (Av)

Example 14.1P14.11 * P14.10 * P14.20 * P14.9 * Figure 14.8 (a) and (b)

Stop Here

Difference Amplifier

How does Vout depend in Vin?

Is there a phase shift between Vout and Vin?

TransformersTransformer Makers Equations

rms2

rms1

1

2

rms1

rms2

II

NN

VV

H-bridge circuit for controlling motors. http://www.cpg1.freeserve.co.uk/servos/servos.htm