A.Ya. Sergeev - Ph. D. (Eng.), Senior Research Scientist, Associate Professor, Department «Radio Engineering and Telecommunication Systems», Peter The Great St.Petersburg Polytechnic University E-mail: acsergeev@yandex.ru

In the article the results of analysis of operation on capacitive load of transistor series inverter are presented. It is shown that such a circuit can be suggested as a penultimate stage of amplification path of the transmitter in which the ending stage is implemented on a tetrode that might be operating in biharmonic mode for the purpose of increase of performance coefficient. For that there is a need to design a penultimate transistor stage that satisfies the following conditions: first, the output load of the stage is presumed to serve as an input circuit of a lamp, which with the use of the modern generating tetrodes can be described as a capacity, secondly, the im-plementation of biharmonic mode requires a special form of the controlling signal containing a third harmonica in the composition. Energetically favorably both of these conditions can be satisfied, in particular, by implementation of controlled recharge of the lamp input capacity by series inverter. In this case the lamp input receives the pulses of voltage of the trapezoidal form containing the third harmonica in antiphase with the first one. In the article the operation on capacitive load of transistor series inverter is analyzed with the transistors lag being taken into account. Lets note, that unlike the classical inverter, transistors here are working in the active mode. The relations are detived allowing for the known input capacity of the tetrode and presumed upper frequency of the operating range to select the parameters of inverter transistors, providing a required range of excitation voltage and harmonic composition of the tetrode, and also allowing to formulate requirements for parameters of the control impulses.

 

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