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Theoretical Foundations for Teaching the Causes of Non-Linear Distortions in Modern High-Efficiency Transmitters

The issues of transmitting equipment energy efficiency are becoming more and more relevant during the transition to digital television and radio broadcasting, as well as an increase in the number of mobile transmitting devices. A potential way to solve this problem can be the use of active elements switching operating modes and synthetic methods of amplification in transmitters. This article has formulated the theoretical foundations necessary for teaching the causes of nonlinear distortions in modern high-efficiency transmitters. The reasons for the invention envelope elimination and restoration (EER) principle of operation - as separate amplification of modulated RF signals components are discussed. General requirements for OFDM transmitters - using the example of requirements for DRM transmitters are analyzed. How high power, high efficiency broadcast transmitters are built for the HF, LF and MF bands is discussed. Nonlinear distortions in EER transmitters are analyzed.