Analog electronics - Volume III - Class A, B, AB, C and D amplifiers

Reading time: 2 minute

Author: Tony R. Kuphaldt
Translated into Romanian by: www.circuiteelectronice.ro
Year of publication: 2009

Definition of electronic circuits

In an electronic circuit, the current is controlled by the current. Electrical circuits represent connections of electrical conductors with circuit elements, within which a uniform movement of electrons takes place. Electronic circuits add a new dimension to electrical circuits, in that the movement of electrons is controlled, to some extent, by an additional electrical signal, either in the form of current or in the form of voltage.

Current control is not necessarily specific to electronics. Switches and potentiometers also control the movement of electrons. Therefore, the difference between electrical and electronic is given by the way in which this control is exercised in the circuit, and not necessarily by its existence or absence. Switches and potentiometers control the mechanical current, through an element actuated by a certain physical force external to the circuit.

In electronics, on the other hand, we are dealing with special elements, able to control the current with the help of another current, or by applying a static voltage. In other words, in an electronic circuit, the current controls the current.

Book structure:

HEAD. I - INTRODUCTION

1. Electrical circuits and electronic circuits
2. Active elements and passive elements
3. amplifier
4. Amplification factor
5. decibel

HEAD. II- PHYSICS OF SEMICONDUCTOR DEVICES

1. Quantum physics
2. Valence and crystal structure
3. Energy bands
4. Electrons and gaps
5. Junction pn
6. diode
7. Bipolar junction transistor (BJT)
8. Field effect transistor (FET)
9. Isolated gate field effect transistor (MOSFET)
10. thyristor

HEAD. III - DIODE AND RECTIFIER

1. Principle of operation of the diode
2. Checking the diode with the ohmmeter
3. Parameters characteristic of diodes
4. Rectifier circuits
5. Zener diode - principles and applications

HEAD. IV - THE TRANSISTOR

1. Transistor - introduction
2. The transistor as a switch
3. Checking the transistor with the ohmmeter
4. Active transistor operating area
5. The static operating point of the transistor
6. Common emitter connection
7. Common collector connection
8. Common base connection
9. Class A, B, AB, C and D amplifiers
10. Transistor bias methods
11. Input and output coupling
12. Reaction amplifiers

HEAD. V - MULTIJUNCTION DEVICES

1. Hysteresis
2. Electronic tubes with gas discharge
3. Docka Shockley
4. DIAC
5. thyristor
6. triac
7. The eight-thyristor

HEAD. VI - OPERATIONAL AMPLIFIER

1. The reference potential amplifier and the differential amplifier
2. Operational amplifier
3. Negative reaction
4. Negative reaction by voltage divider
5. Voltage-current amplifier
6. Addition and mediation circuits
7. Making a differential amplifier
8. Instrumentation amplifier
9. Bypass and integration circuits
10. Positive reaction