Power Amplifiers: Class B & AB

This lecture covers the practical realization and assembly of power stages with low output impedance, focusing on the push-pull collector type. It explains the operation of class B & AB amplifiers, discussing cross-over distortion and transistor polarization. The theoretical calculation of power in sinusoidal regime and the efficiency of amplifiers are also addressed, along with the evolution of elementary assembly and the fundamental limits of output power. The lecture concludes with the selection of a suitable driver stage for power supply.