DEVELOPMENT OF REQUIREMENTS TO THE INDIVIDUAL UNITS CHARACTERISTICS OF A HIGH-EFFICIENCY SINGLE-SIDEBAND TRANSMITTER WITH ENVELOPE ELIMINATION AND RESTORATION

V. N. Gromorushkin
Institute of Radio and Information Systems (IRIS), Vienna, Austria;
Moscow Technical University of Communications and Informatics, Moscow, Russia, grom@mtuci.ru

O. V. Varlamov
Institute of Radio and Information Systems (IRIS), Vienna, Austria;
Moscow Technical University of Communications and Informatics, Moscow, Russia, vov@mtuci.ru

DOI: 10.36724/2664-066X-2025-11-5-2-9

SYNCHROINFO JOURNAL. Volume 11, Number 5 (2025). P. 2-9.

Abstract

Increasing the data transfer rate leads to the use of spectrally efficient types of amplitude-phase modulation, characterized by high values of the peak factor. For energy-efficient amplification of such signals, it is promising to use transmitters built using the Envelope Elimination and Restoration (EER) method. Purpose: further development of methods for using switching operating modes of active elements, taking into account the current state of the element base, increased capabilities of digital signal processing and computer modeling of various transmitter units operation. Development of requirements for the characteristics of EER transmitter units, based on a given level of intermodulation distortions and out-of-band oscillations and development of EER transmitter structural diagram with the possibility of subsequent increase in output power. Methods: an analysis of the requirements for individual units is carried out, taking into account the possibility of their combined influence. Results: a structural diagram of 250 … 300 W HF range EER transmitter has been developed with the possibility of subsequent increase in the transmitter output power. Variants of implementing output power adjustments have been proposed and requirements for the transmitter exciter characteristics have been developed. Practical relevance: the implementation of the developed recommendations will ensure the fulfillment of requirements for permissible intermodulation distortions of the amplified signal and the permissible level of out-of-band oscillations.

Keywords:  power amplifier; single-sideband modulation; Envelope Elimination and Restoration; energy efficiency; intermodulation distortion; out-of-band emissions

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