A.S. Oleynik – Dr.Sc.(Eng.), Professor,
Department «Electronic Devices and System Engineering», Yuri Gagarin State Technical University of Saratov E-mail: anatoly.semenovich@gmail.com
A.A. Titkov – Head of Laboratory,
JSC «RPE «Almaz» (Saratov)
E-mail: titkov-1973@yandex.ru
N.A. Penkevich – Engineer,
OOO «NPP «Inject» (Saratov)
E-mail: nikitapenkevich@gmail.com
In this article was solved the task of building circuits of the solid-state power amplifier designed for application in final stages of the transmission systems. The amplifier was designed on the domestic database using modules PBbA type I, PBbA type II, and had the output power no less than 10 W, in C, X, Ku frequency band with the three-fold frequency coverage. Also the pictures of the external view of modules PBbA type I, PBbA type II were demonstrated in this paper. The case of using the identical power elements in preamplifier and final cascades of the designed amplifier, in modeling of circuits on grid adders was discussed in the article as well. It was shown and analyzed the block diagram of the cascade of the signal multiplication on elements PBbA type I, PBbA type II. The analysis of interference of the parameters of divider and gain coefficient of the active element, detecting additional constraints on active component parameters and power divider requirements of the microwave signal was made here. Also the analysis of the amplification coefficient influence of the active component on the required transfer constant of the divider in the circuit constructed on the domestic module database was carried out. It was noticed that the output cascades power charging which differs from the optimal results in the essential increasing of their amount. The article also shows the depreciation formula of the minimum necessary quantity of summation channels in terms of requirements to the output power of device. The block diagram of amplifier using the modules PBbA type I, PBbA type II was designed here in this paper. The justification of three-channel combiner and signal divider was also demonstrated here. The requirement of minimal value of the gain coefficient of active element when using in output and preamplifier cascades of the equal amplifying elements was noticed here as well. The calculated output power of the amplifier cell is 2,4 W. It was specified that combining in the output of the sixth amplifier cells provides the output power of device in general no less than 10 W. In task solution of minimizing the quantity of the active elements was calculated the quantity of gained channels in specified gain coefficient of the active element and advanced some claims to maximum allowed losses of power divider. Also the minimum gain coefficient of the active element in three-channel cascade of combining and signal dividing was found out. This approach leads to almost full loading of preamplifier cascades by power and achievement of the maximum power of the output power elements. The optimum amount of output power elements was also mentioned. The task of minimizing the amount of amplifying elements was solved at the expense of the most optimum power distribution to the amplifying arms in designing the amplifier on active elements PBbA type I, PBbA type II and microwave signal combiners/dividers with losses no less than 1,2 dB.
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