Analysis of packaging effects on wire bonder made microtransformer chips

Moazenzadeh, Ali; Moosavi, S. Hoda; Spengler, Nils; Zeiser, R.; Wallrabe, Ulrike

doi:10.1088/1742-6596/476/1/012110

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Embedding a microcoil in PMMA can diminish its Q-factor, since replacing the air between windings with PMMA (higher di electric loss tangent) increases capacitance and parasitic losses. This effect becomes prominent at frequencies approaching self-resonance, where a significant fraction of the energy is stored in the electric field [24]. It is well known that, for increasing frequency, a microcoil resonator passes from inductive to capacitive behaviour at its self-resonance frequency.…”

Section: Discussionmentioning

confidence: 99%

Hollow microcoils made possible with external support structures manufactured with a two-solvent process

Kamberger

Moazenzadeh

Korvink

et al. 2016

J. Micromech. Microeng.

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We present a process to manufacture solenoidal microcoils with external support structures, which leaves the space within the coil windings free. The manufacturing procedure is based on a two solvent approach (water and acetone), for selectively etching polyvinyl alcohol and polymethyl methacrylate. Two sets of microcoils were manufactured with an inner diameter of 1.5 mm, an interwinding pitch of 100 μm and five or eight coil windings respectively. The coils were designed for application in magnetic resonance imaging and spectroscopy, and characterised in a 9.4 T MR scanner. An NMR spectrum of water and MR images in receive only and transceive mode were acquired as proof of concept.

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Section: Discussionmentioning

confidence: 99%

Hollow microcoils made possible with external support structures manufactured with a two-solvent process

Kamberger

Moazenzadeh

Korvink

et al. 2016

J. Micromech. Microeng.

Self Cite

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“…This is a three-dimensional geometry, used exclusively in solenoid-type microtransformers, and can be coreless or have a solid core. This kind of geometry yields good coupling coefficients (higher than 80% in most of the devices analyzed) and can achieve high quality factors (Qvalues up to 27 have been reported) [49]- [51], [54]- [57], [60], [65], [67], [68]. On the other hand, microtransformers using this geometry are usually assembled using 1:1 or 1:2 turn ratios, having low inductance values [49], [55], [58], [67], [69].…”

Section: Bar/rod/linearmentioning

confidence: 98%

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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Analysis of packaging effects on wire bonder made microtransformer chips

Cited by 2 publications

References 5 publications

Hollow microcoils made possible with external support structures manufactured with a two-solvent process

Hollow microcoils made possible with external support structures manufactured with a two-solvent process

A Survey on Microtransformers

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