مضخم إلكتروني: الفرق بين النسختين

 

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A practical circuit using class-B elements is the [[push-pull output|push–pull stage]], such as the very simplified complementary pair arrangement shown below. Here, complementary or quasi-complementary devices are each used for amplifying the opposite halves of the input signal, which is then recombined at the output. This arrangement gives excellent efficiency, but can suffer from the drawback that there is a small mismatch in the cross-over region{{spaced ndash}} at the "joins" between the two halves of the signal, as one output device has to take over supplying power exactly as the other finishes. This is called [[crossover distortion]]. An improvement is to bias the devices so they are not completely off when they're not in use. This approach is called ''class AB'' operation.