S.I. Babusenko1, V.V. Kiryushkin2, A.V. Zhuravlev3, V.V. Isaev4

1-4 JSC RIE “PROTEK” (Voronezh, Russia)

Problem statement. One of the main problems of power amplifiers for multi-frequency radio signals is the insufficient efficiency of using the energy potential of the output stages of amplifiers, due to the high value of the crest factor of the group signal, which in turn depends on the number and spacing of subcarrier frequencies of the group signal, the type of modulation, as well as the phase and amplitude relationships between them. One of the methods for reducing the value of the crest factor is the dephasing method. The effectiveness of this method depends on the amplitude-phase non-identity of the amplification channels and the sample size of the generated signal.

Purpose. To develop a model of the group signal amplification path with dephasing and to substantiate the requirements for the accuracy of the group signal formation and the non-identity of the amplification channels, taking into account the minimization of the level of out-of-band radiation and ensuring the integrity of the structural and temporal parameters of the emitted signal.

Results. The paper presents the results of modeling the amplification path based on the dephasing method. The requirements for its characteristics to ensure potential energy performance and reduce out-of-band radiation of the transmitting device are substantiated, taking into account the integrity of the structural-temporal parameters of the emitted oscillation.

Practical significance. The dephasing method in practice makes it possible to reduce out-of-band emissions of the transmitting path and provide a higher efficiency of the transmitting path due to the constancy of the envelopes of the amplified components. The non-identity of the output stages of the amplifier should be compensated by introducing a phase and amplitude correction for the corresponding radiation frequency f0. With allowable path compensation errors of 5° and 0.2 dB, the use of a digital scheme for the formation of dephasing components with an interpolation factor of 8 makes it possible to reduce out-of-band emissions by more than 7.2 dB.

Babusenko S.I., Kiryushkin V.V., Zhuravlev A.V., Isaev V.V. RF path of forming and amplifying a group radio signal based on the dephasing method. Radiotekhnika. 2022. V. 86. № 7. P. 100−106. DOI: https://doi.org/10.18127/j00338486-202207-16 (In Russian)

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