Micromachined Coreless Single-Layer Transformer Without Crossovers

Khan, Fahimullah; Zhu, Yong; Lu, Junwei; Pal, Jitendra; Dao, Dzung Viet

doi:10.1109/lmag.2015.2477480

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…The present electron doped Ca 0.85 Sm 0.15 MnO 3 (CSMO) manganite shows different interesting physical properties such as magnetoresistance [15], Griffiths phase, magnetic relaxation behavior and magnetocaloric effect [16]. The result of magnetoresistace study of electron doped CSMO compound signifies that spin-polarized tunneling contributes in the conduction process [15]. Magnetocaloric effect is prominent in the vicinity of the phase transition temperature T C =115 K and the magnetic entropy change curves show sharp peaks [16].…”

Section: Introductionmentioning

confidence: 90%

“…They attributed this nonconventional magnetic interaction to the inhomogeneous magnetic state present both below and above T C. Virgin CaMnO 3 is a G-type antiferromagnet, by Sm doping at the Ca-site the magnetic interaction study of the electron doped compound can be done. The present electron doped Ca 0.85 Sm 0.15 MnO 3 (CSMO) manganite shows different interesting physical properties such as magnetoresistance [15], Griffiths phase, magnetic relaxation behavior and magnetocaloric effect [16]. The result of magnetoresistace study of electron doped CSMO compound signifies that spin-polarized tunneling contributes in the conduction process [15].…”

Section: Introductionmentioning

confidence: 91%

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Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite

et al. 2019

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We have reported the magnetic properties and critical behavior of electron doped Ca0.85Sm0.15MnO3 (CSMO) sample prepared by solid state reaction technique. With increasing temperature the CSMO sample undergoes ferromagnetic to paramagnetic phase transition at 115 K. The positive value of the Landau coefficient b(T) estimated from the fitting of magnetization data with equation of state suggests that the CSMO sample undergoes 2nd order magnetic phase transition. The positive slopes of Arrott plots corroborate the same. Further study of the critical behavior of the CSMO sample was done by analysis of Kouvel–Fisher plot and critical isotherm. The calculated values of the critical exponents and differ significantly from the values which correspond to three dimensional mean field, tri-critical mean field, 3D Ising and 3D Heisenberg models. This indicates the nonconventional nature of ferromagnetism induced in the CSMO sample by Sm doping at the Ca site.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 91%

Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite

et al. 2019

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“…Microtransformers using geometries different from those already discussed have been reported. Some of the examples are: e-shaped, fractal, polygonal and meander [16], [21], [28], [40], [59], [121]- [127]. Most of these singular microtransformers have coplanar or multi-layer structures and present 1:1 turn ratios.…”

Section: Other Geometriesmentioning

confidence: 99%

“…Publications reporting the development of microtransformers for communications are about 34% of the works analyzed [6], [16]- [19], [21], [23], [28], [32], [34]- [39], [48], [49], [51], [52], [55], [60], [61], [63], [68], [74], [75], [82], [83], [95], [103], [107], [110], [121]- [123], [136]. This includes applications like UHF and VHF circuits and microwave monolithic integrated circuits.…”

Section: B Communicationsmentioning

confidence: 99%

A Survey on Microtransformers

Nascimento

Telles

Joanni

et al. 2021

JICS

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The miniaturization of magnetic devices is a subject of enduring interest, since inductors and transformers of very small dimensions are constantly being required for integration into microchips and electrical circuit boards. The main objective of this survey is to supply a compilation of the published research on microtransformers, and to work as a support material, helping in the choice of the most appropriate technology and device configuration for a particular application. The text describes the historical development of microtransformers, the structures in which these devices might be assembled, the various proposed geometries, the fabrication processes, and the type of core used. A brief discussion of equivalent circuit modeling is presented. The current state of the technology in relation to commercial devices is then examined, pointing out some unsolved problems that warrant further studies.

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“…1. The spiral inductors/transformer achieves more inductance compared with meander or Hilbert shape fractal transformer in the same bounded square area [13], [14]. Therefore, symmetric transformer designs have been modeled and characterized in this paper.…”

Section: A Design Considerationsmentioning

confidence: 99%

Design and Implementation of Single-Layer Symmetric Micro-Transformers

Khan

Zhu

et al. 2016

IEEE Trans. Magn.

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In this paper, interleaved planar symmetric micro-transformers are implemented with single metal layer for the first time in the standard Metal-multiuser micro-electro-mechanical process (MUMP). Bonding wires are used for leading the inner terminal connections out to the outer terminal of the spiral square transformers. Two designs of micro-transformers with different dimensions are fabricated. The functionality of the devices was tested for very high frequency and ultra high frequency ranges using cascade ground signal ground probes and compared with the simulation results. The maximum efficiency of 80.65% has been achieved by S1 micro-transformer design, and the maximum efficiency of S2 micro-transformer is 76.9% at 1 GHz. The total footprint of S1 and S2 designs is 1.32 and 0.37 mm 2 , respectively.

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Micromachined Coreless Single-Layer Transformer Without Crossovers

Cited by 14 publications

References 17 publications

Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite

Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite

A Survey on Microtransformers

Design and Implementation of Single-Layer Symmetric Micro-Transformers

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Micromachined Coreless Single-Layer Transformer Without Crossovers

Cited by 14 publications

References 17 publications

Magnetic properties and critical behavior of electron doped polycrystalline Ca0.85Sm0.15MnO3 manganite

Magnetic properties and critical behavior of electron doped polycrystalline Ca0.85Sm0.15MnO3 manganite

A Survey on Microtransformers

Design and Implementation of Single-Layer Symmetric Micro-Transformers

Contact Info

Product

Resources

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Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite

Magnetic properties and critical behavior of electron doped polycrystalline Ca_0.85Sm_0.15MnO₃ manganite