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Tuning the Inductance of Magnetic Inductor with DC Current

The development of adjustable magnetic inductors is a trend in modern electronics. The tunability of these components is very important, because it allows the setting of optimum performance of electronic circuit. In this paper, research focus is on the ferrite inductor, made of ESL 40011 LTCC tape, which is DC current tunable. Four ferrite cores were sintered at different peak temperatures (1200 °C, 1100 °C, 1000 °C and 850 °C). Based on experimental results, a model of change in inductance of each ferrite inductor made for different values of frequency (100 kHz and 1 MHz)and DC current intensity (0–500 mA)is presented. Model of inductance change for each inductor is fitted using polynomial of 4th order.