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Electromagnetic field and circuit theory combined is applied to calculate the impulse grounding impedance in HVDC transmission line towers in this paper. The mutual inductance of conductor segments are taken into account. At the same time, the images of the self resistance and mutual inductance are considered for the different medium (soil and air) interface on the surface of the ground. To calculate...
Abstract─This paper describes a method for calculating excitation impedance and iron loss in transformer.The method is based on a formula which is derived from an exact solution of Maxwell's Equations for coils on ferromagnetic cores.The calculation is based on winding geometry and on the core magnetic permeability and effective electrical resistivity. Eddy-current effect and skin effect in the core...
We report a systematic investigation and design optimization of CMOS-compatible on-chip ferrite-integrated inductors, including a detailed quantitative analysis by simulation and circuit modeling, new ferrite material fabrication and characterization, and ferrite-integrated-inductor design, characterization, and optimization. A new ferrite nanopowder-mixed-photoresist spin-coating/inkjetting technique...
New on-chip RF solenoid inductors with Ni-Zn-Cu ferrite-filled structure are reported. The concave-suspending solenoids are fabricated by a post-CMOS MEMS process, and then a CMOS compatible low-temperature nano-powder-mixed-photoresist filling technique is used to fill ferrites into the inductor cavities. It shows significant improvements in inductance L and quality factor Q up to +60% and +107%,...
This paper reports fabrication of on-chip RF integrated inductors with spin-coated ferrite thin-films (Ni-Zn-Cu-Fe-O, Y-Bi-Fe-O and Co-Zr-O) and high-frequency characterization using equivalent circuit model. Measurement results show that, compared with air-cored inductor, the inductance (L) of Y-Bi-Fe-O and Co-Zr-O thin-film samples increases by 26-50% and 20-39% in 0.1-9GHz, respectively; while...
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