Active devices
Power amplifiers
Operational amplifiers (op-amps)
Distributed amplifiers
Switched mode amplifiers
Negative resistance amplifier
Video amplifiers
Microwave amplifiers
Musical instrument amplifiers
Charge transfer amplifier
CMOS amplifiers
Current sense amplifier
Distributed amplifier
Doherty amplifier
Double-tuned amplifier
Faithful amplifier
Intermediate power amplifier
Low-noise amplifier
Negative feedback amplifier
Optical amplifier
Programmable-gain amplifier
Tuned amplifier
Valve amplifier