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Advantages of Complementary Amplifiers is a document available to read on EtoBox.
The document discusses the advantages of using a complementary symmetrical input stage in audio amplifiers. It describes how using both PNP and NPN input differential pairs, rather than a single pair, provides a symmetric slew rate where rise and fall times are equal. This overcomes limitations of a single differential pair which degrades performance in non-inverting mode. The complementary pairs help cancel distortions from the input devices through reverse current flow in opposing transistors. This reduce
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