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Wybrane problemy konstrukcji i montażu układów RF

Kowalke Wojciech, Górecki Krzysztof, Ptak Przemysław

Elektronika : konstrukcje, technologie, zastosowania

2021

Vol. 62, nr 11

16--22

W pracy przedstawiono wybrane problemy konstrukcji i montażu układów elektronicznych dedykowanych do pracy w zakresie wysokich częstotliwości. Opisano problem powiązania procesu projektowania układów elektronicznych w odniesieniu do wymogów jakościowych. Rozważono wpływ wybranych parametrów elektrycznych na konstrukcje wybranych elementów mocy. Na przykładzie wzmacniacza Doherty’ego opisano właściwości układu wzmacniającego RF i jego konstrukcję ze szczególnym uwzględnieniem procesu jego montażu na płytce drukowanej. Omówiono problemy związane z różnymi ograniczeniami takich układów, w tym konstrukcyjne. Na przykładzie wzmacniacza Doherty’ego, przedstawiono sposób wzmocnienia sygnałów RF, który pozwala zredukować koszt drogich elementów elektronicznych mocy stosowanych w układach wzmacniaczy mocy.

The paper presents selected problems of the construction and assembly of electronic systems dedicated to operate in the high frequency range. The problem of linking the process of designing electronic circuits with regard to quality requirements are described. The influence of selected electrical parameters on the structures of selected power devices is considered. Using the example of the Doherty amplifier, the properties of the RF amplifying circuit and its construction are described, with particular emphasis on the process of its assembly on a printed circuit board. Problems related to various limitations of such systems, including design, are discussed. On the example of the Doherty amplifier, a method of amplifying RF signals is presented, which allows to reduce the cost of expensive power electronic components used in power amplifiers.

Zastosowanie logicznych drzew decyzyjnych do analizy wad w etapie lutowania na fali podczas montażu SMT

Sadowińska M.

Zarządzanie Przedsiębiorstwem

2014

Vol. 17, nr 2

26--33

Decision trees are a logical method, which graphically presents the solution of logical function. They consist of the branch on which the data are coded variables. Solutions are presented as the true path. The method used to optimize the solution functions are logical decision trees, the construction of which the principle is the same as the logical trees. They make it possible to eliminate the occurrence of twigs isolated and cut off the full beam. This procedure allows to minimize the real twigs. This is advantageous due to the phenomenon that the optimal solution is the combination of variables, which is associated with the tree having the smallest number of real branches. This tree defines the status of the variables tested from most to least important. The purpose of the study was to determine the hierarchy of defects affecting the destabilization of one of the stages of the process SMT (surface mount), which is the wave soldering, and by this determine which should be eliminated in the first place. A tool that has been used for this purpose was a logical decision trees. According to the results of the analysis in the first place should prevent the causes of the formation of solder bridges (machine failure), then-without regard to the order-of overheating the PCB and too low solder temperature (the same effects on the occurrence of errors), which are the result of poor machine settings and the occurrence of machine failure. Thanks to the possibility of using minimization of logical variables (cutting off the full beam) in practical terms, the elimination of identified defects, it is necessary to determine the corrective action regarding the causes of defects, namely the lack of solder. This approach meant that the error should not be the subject of corrective action performed. The indicating reason was responsible only for the occurrence of the lack of solder. The using of logical decision trees could help identify priorities for improvements to the wave soldering realized as part of a process of SMT assembly.