Professional Amplifiers are often used in broadcasting, output stages of communication transmitters, output stages of audio systems, and amplifiers for driving actuators in control systems. The application occasions are different, the performance requirements are different, and the circuit composition and work type are also different. Commonly used are linear power amplifiers, resonant power amplifiers, broadband power amplifier circuits, and so on. To increase the output power, power synthesis technology can be used.

Professional Amplifiers usually consist of 3 parts: preamplifier, driver amplifier, and final power amplifier.