공통 소스 증폭기: 동작, 특징 및 응용

Common Source Amplifier is a semiconductor-based amplifier that plays an important role in electronic circuits. Signals are amplified using semiconductor devices, primarily metal-oxide-semiconductor field-effect transistors (MOSFETs) or bipolar junction transistors (BJTs). In this article, we will take a closer look at the operating principles of common source amplifiers, their features and their various applications.

 

Operating principle of common source amplifier:

A common source amplifier is a circuit that uses a common source terminal to amplify the input signal. An input signal is applied to the gate terminal, and the current between the source and drain changes depending on the gate-source voltage. This current change is amplified into an output signal and passed to the output device.

Features of common source amplifier:

• High Input Impedance: Common source amplifiers have very high input impedance between gate and source. This means that signals from external signal sources can be accepted efficiently.
• Medium Output Impedance: The output impedance is low, allowing the output signal to be effectively passed to other load circuits.
• Voltage amplification: The output voltage is amplified based on changes in gate-source voltage.
• Frequency response: Common source amplifiers can operate over a wide frequency range and can effectively amplify even high-frequency signals.

Applications of common source amplifier:

• Audio Amplifier: Common source amplifiers are popular for amplifying audio signals. This allows audio signals to be amplified and delivered to output devices such as speakers or headphones.
• Radio Frequency Amplifier: In radio receivers, a common source amplifier is used to amplify radio frequency signals and convert them into audio signals.
• Sensor Applications: Common source amplifiers are used to amplify and process signals from various sensors. For example, signals collected from temperature or pressure sensors can be amplified and passed to a microcontroller.

Conclusion:

Common source amplifiers are semiconductor-based amplifiers that play an important role in a variety of applications. These devices effectively amplify input signals and deliver them to output devices, and are used in a variety of fields from audio amplifiers to sensor applications. Therefore, understanding common source amplifiers is considered core knowledge in electronics and applications.