Noise suppression and crosstalk analysis of on-chip magnetic film-type noise suppressor

Abstract

This paper discusses near field, conduction and crosstalk noise suppression of magnetic films with uniaxial anisotropy on transmission lines for a film-type noise suppressor in the GHz frequency range. The electromagnetic noise suppressions of magnetic films with different permeability and resistivity were measured and simulated with simple microstrip lines. The experimental and simulated results of Co-Zr-Nb and CoPd-CaF2 films agreed with each other. The results indicate that the higher permeability leads to a better near field shielding, and in the frequency range of 2–7 GHz, a higher conduction noise suppression. It also suggests that the higher resistivity results in a better crosstalk suppression in the frequency range below 2 GHz. These results can support the design guidelines of the magnetic film-type noise suppressor used in the next generation IC chip.

Crosstalk suppression of magnetic films covered by two parallel microstrip lines

“…Less than few-μm-thick magnetic film was proposed as a GHz frequency-selective noise suppressor using ferromagnetic resonance (FMR) loss for IC chips and packages. [15][16][17][18][19][20][21][22][23][24][25][26] We clarified the mechanism of conductive noise suppression and shielding effectiveness of a few-μm-thick magnetic films covered onto a single transmission line and a circuit in order to develop the design guidelines. [22][23][24][25][26] However, there are few studies on suppressing electromagnetic noise coupling between lines and circuits.…”

“…[15][16][17][18][19][20][21][22][23][24][25][26] We clarified the mechanism of conductive noise suppression and shielding effectiveness of a few-μm-thick magnetic films covered onto a single transmission line and a circuit in order to develop the design guidelines. [22][23][24][25][26] However, there are few studies on suppressing electromagnetic noise coupling between lines and circuits. In this study, we prepared simple two parallel microstrip lines (MSLs) as a test bench, and measured crosstalk suppressions between MSLs with the three-type noise suppressors using Co-Zr-Nb amorphous, Ni-Fe polycrystalline, and (Co-Pd)-CaF 2 nanogranular soft magnetic films with uniaxial anisotropies.…”

“…In the case with films, |s 11 | increased by about 10 dB at 1 GHz because of the additional metallic boundary of the magnetic film. 19,23) The insertion loss difference, which was defined as the difference between |s 21 | in the case of blank and film-covered MSLs, became larger as the frequency increased because of the combination of FMR and Joule losses in each film, and was several dBs in the GHz range. The FMR losses in Co-Zr-Nb, Ni-Fe and (Co-Pd)-CaF 2 films can increase and maximize at effective FMR frequency of approximately 2.7, 2.2 and 6.0 GHz, respectively.…”