The analysis of transformers built with planar coils, is found for integrated circuits. In this case, the application is specific, and the analysis does not used to high energy, although some results may be utilized for applications in induced eletromotive force for transformers with large dimensions. The need to analyzes these specific transformers is found in the reduction of electromagnetics devices and their applications, which actually is each time more present. The analysis of these kinds of transformers is presented with two ways: the first is the excitation with square waves to see responses and effects, that is applied to several engineering problems as power electronics, and others, and the second way with the excitation with sinusoidal voltages, to verify their energy transfer, evaluating possibilities of their use in compactation and applications of the actual transformers. These applications may be seen in several researches on electromagnetics fields, considering analysis on their characteristics as self and mutual inductances or parasitic capacitances. With these feasible applications, an analysis about transformers built with planar coils is presented in this paper, considering the case of square wave excitation, comparing this analysis with the related problems of others papers.
Thus, in this paper is presented an analysis of found results of experiments developed with transformers built with planar coils, when they are excited by square waves, in comparison with transformers built with planar coils inner ring coils. The transformer was built joining two planar coils one over the other. In this kind of transformer, similar responses as analysis of transformers built with planar coil inner ring coil is found, as well the results of resonance. Because the low self-inductances and parasitic capacitances obtained in these configurations, although the coils resistance are low, what generates low exponential drops on responses, the resonance is found in higher frequencies, but satisfying conditions of sum of responses in resonance.