Which of following class of amplifiers provides highest efficiency ?

Explanation:

Class F Amplifiers

Definition: Class F amplifiers are a type of tuned radio frequency (RF) amplifiers that achieve maximum efficiency by shaping the voltage and current waveforms using harmonic tuning. These amplifiers utilize harmonic resonators to manipulate the waveform, ensuring the voltage and current waveforms are non-overlapping, thus minimizing power dissipation.

Working Principle: The Class F amplifier works by employing harmonic tuning circuits that allow specific harmonics of the input signal to resonate while suppressing others. This tuning helps shape the output waveform to approximate a square wave for voltage and a half-sine waveform for current. By ensuring that the voltage and current waveforms are out of phase (non-overlapping), the power dissipation in the transistor is reduced, leading to higher efficiency.

Efficiency: Class F amplifiers are among the most efficient types of amplifiers, with theoretical efficiencies reaching up to 90% or more. This high efficiency is achieved by reducing the overlap between voltage and current waveforms during operation, minimizing energy loss as heat.

Correct Option Analysis:

The correct option is:

Option 4: Class F

Class F amplifiers provide the highest efficiency among all amplifier classes due to their unique waveform shaping technique, which minimizes the overlap between voltage and current waveforms, significantly reducing power dissipation