a) Linear Amplifiers – These amplifiers are used to amplify weak signals without distortion. They are commonly used in communication systems, audio equipment, and instrumentation.
b) Non-Linear Amplifiers – These amplifiers are used to amplify signals with nonlinear characteristics, such as power amplifiers used in radio-frequency (RF) transmitters.
a) Class A – These amplifiers provide the highest quality output signal with low distortion. They are commonly used in high-fidelity audio equipment.
b) Class B – These amplifiers provide high efficiency but have higher distortion levels than class A amplifiers. They are commonly used in RF power amplifiers.
c) Class AB – These amplifiers are a compromise between class A and class B amplifiers, providing high-quality output with moderate efficiency. They are commonly used in audio power amplifiers.
d) Class D – These amplifiers use pulse-width modulation to create a digital signal that is amplified by a switching amplifier. They provide high efficiency but may have higher distortion levels than other classes of amplifiers. They are commonly used in portable audio equipment.
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