Class B amplifiers are greatly preferred over Class A designs for high-power applications such as audio power amplifiers and PA systems. Like the class-A amplifier circuit, one way to greatly boost the current gain ( A i) of a Class B push-pull amplifier is to use Darlington transistors pairs instead of single transistors in its output circuitry.

When Class-B amplifiers amplify the signal with two active devices, each operates over one half of the cycle. Efficiency is much improved over class-A amplifiers. [14] Class-B amplifiers are also favoured in battery-operated devices, such as transistor radios. Class B has a maximum theoretical efficiency of π/4 (≈ 78.5%). [15]

When the collector current flows only during the positive half cycle of the input signal, the power amplifier is known as class B power amplifier.

Class B amplifier can be defined as, whenever the collector current (Ic) supplies simply throughout the positive half cycle of the input signal, then this is called class B amplifier. This is is one kind of power amplifier that uses two complementary types of transistors (PNP &NPN) to conduct the half cycles of the i/p signal.

Dec 11, 2018 · Class B Amplifier . The Class B amplifier is a bit different from the Class A. It is created using two active devices which conduct half of the actual cycle, ie 180 degrees of the cycle. Two devices provide combined current drive for the load. In the above image, an Ideal Class B amplifier configuration has been shown.

May 22, 2022 · The Class A amplifier presents input and output impedances that are almost independent of the level of the signal. However, a Class B, AB, or C amplifier presents input and output impedances that vary depending on the level of the RF signal.

This section is the design of the Class B push pull amplifier. Section: 1 Class B push pull stage. Part 1 Class B Step ClassB 1.1: ClassB Intro Vdd = - Vee Need both supplies equal but opposite with center ground. Vin2 = Vout – Vbe Vin2 is the AC signal at the base of the BJT. Start from Vout. Rin2 is the impedance looking into amplifier thru ...

Class B Power Amplifier – Operation and Efficiency derivation: In Class B Power Amplifier operation, the transistor is so biased that zero signal collector current is zero. Hence class B operation does not need any biasing system.

Jan 12, 2024 · This article introduces the Class B power amplifier, which has a theoretical maximum efficiency of 78.5%. After discussing the Class B amplifier’s basic characteristics, we’ll explore the reasons for that difference in efficiency.

Mar 22, 2021 · Determine the compliance, maximum load power, efficiency and required device ratings for class B circuits. Discuss the advantages and disadvantages of class B operation versus class A operation. Discuss the origin of notch distortion and methods used to mitigate it.