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Definition of "class B amplifier" |
Class B amplifier are those in which the output transistors only conduct during half (180 degrees) of the signal waveform. To amplify the entire signal two transistors are used, one conducting for positive output signals and the other conducting for negative outputs.Class B amplifiers are much more efficient than class A amplifiers, but have high distortion due to the crossover point when the two transistors transition from on to off. / (1) an amplifier in which the active device acts as a modulated current source biased at conduction cutoff. In a class B amplifier, an applied sinusoidal signal will result in only half of the sinusoid being amplified, while the remaining half is cut off. Further increases in the signal amplitude will eventually cause the remaining half of the signal to saturate and clip, which is usually avoided. This is equivalent to a conduction angle of 180 degrees, regardless of signal amplitude. |
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