Page 15 - Teach Yourself Electricity and Electronics

Contents xv

Depletion mode versus enhancement mode 425
Common-source circuit 425
Common-gate circuit 426
Common-drain circuit 427
A note about notation 429
Quiz 429

24 Amplifiers 433
The decibel 433
Basic bipolar amplifier circuit 437
Basic FET amplifier circuit 438
The class-A amplifier 439
The class-AB amplifier 440
The class-B amplifier 441
The class-C amplifier 442
PA efficiency 443
Drive and overdrive 445
Audio amplification 446
Coupling methods 447
Radio-frequency amplification 450
Quiz 453
25 Oscillators 457
Uses of oscillators 457
Positive feedback 458
Concept of the oscillator 458
The Armstrong oscillator 459
The Hartley circuit 459
The Colpitts circuit 461
The Clapp circuit 461
Stability 463
Crystal-controlled oscillators 464
The voltage-controlled oscillator 465
The PLL frequency synthesizer 466
Diode oscillators 467
Audio waveforms 467
Audio oscillators 468
IC oscillators 469
Quiz 469

26 Data transmission 474
The carrier wave 474
The Morse code 475
Frequency-shift keying 475
Amplitude modulation for voice 478
Single sideband 480