Question

Which amplifier gives maximum distortion?

Answer 1

Hint: Power amplifier classes are letter symbols that are given to several power amplifier types in electronics. The class describes the features and performance of an amplifier in general. The classes are based on the active amplifier device's current passing time, which is represented as a fraction of the period of a signal waveform supplied to the input.

Complete step by step answer:
A class A amplifier conducts for the whole duration of the signal; a class B amplifier conducts for one-half the input time, and a class C amplifier conducts for significantly less than half the input period. A Class D amplifier runs its output device in a switching mode, with the proportion of time the device is conducting modified to produce a pulse width modulation output. Extra letter classes are defined for special-purpose amplifiers with additional active components or specific power supply enhancements; sometimes, a company may adopt a new letter symbol to advertise its unique design.
Less than half of the input signal is utilised in a class-C amplifier (conduction angle\[180^\circ \]). Because of the significant distortion, practical usage necessitates the use of a tuned circuit as a load. In radio-frequency applications, efficiency can approach 80%. Class-C amplifiers are most commonly used in RF transmitters with a single set carrier frequency and a tuned load on the amplifier to limit distortion. The input signal activates the active device, causing current pulses to flow through a tuned circuit that forms part of the load. There are two modes of operation for the class-C amplifier: tuned and untuned.
Only when the collector voltage is at its lowest can the active element conduct. This reduces power dissipation in the active device while increasing efficiency. In an ideal world, the active element would only pass an instantaneous current pulse while the voltage across it is zero, dissipating no power and achieving 100% efficiency. Practical devices, on the other hand, have a limit on the peak current they can pass, thus the pulse must be broadened to approximately 120 degrees to provide a respectable amount of power, and the efficiency drops to 60–70 percent. As a result, class C is the correct answer.

Note:
An audio power amplifier (also known as a power amplifier) is an electrical amplifier that boosts low-power electronic audio signals, such as those from a radio receiver or an electric guitar pickup, to a level that can drive loudspeakers or headphones. Sound reinforcement, public address, and home audio systems, as well as musical instrument amplifiers such as guitar amplifiers, all use audio power amplifiers. Before the signal is delivered to the loudspeakers, it passes through the final electrical step in a conventional audio playback chain.