Ferromagnetic RF Integrated Inductor with Closed Magnetic Circuit Structure

Yamaguchi, Masahiro; Bae, Seok; Kim, Ki Hyeon; Tan, K.; Kusumi, Takayuki; Yamakawa, K.

doi:10.1109/mwsym.2005.1516599

Cited by 23 publications

(7 citation statements)

References 5 publications

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“…While previous work has demonstrated an increase in inductor frequency due to similar patterning for higher FMR frequencies, either the inductance enhancements of those designs were very low (<1.2×) [20][21][22] or the Q-factors were low (≤2.5) [26]. The inductors shown here are the first to demonstrate overall optimization of inductance enhancement, quality factor, and operating frequency, simultaneously.…”

Section: Resultsmentioning

confidence: 62%

“…The first method of increasing the FMR frequency is to pattern the dimensions of the core so as to maximize the length of the magnetic core parallel to its in-plane uniaxial magnetization. This practice has been shown to increase the FMR frequency while consequently also reducing the permeability as a fundamental trade-off [20][21][22][28][29][30][31][32][33]. The second method builds on this and utilizes ultra-thin laminations in the thickness direction to also increase the FMR frequency [34].…”

Section: Inductance and Bandwidthmentioning

confidence: 99%

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Gigahertz-Band Integrated Magnetic Inductors

El‐Ghazaly

White

Wang

2017

IEEE Trans. Microwave Theory Techn.

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The demand on mobile electronics to continue to shrink in size while increase in efficiency drives the demand on the internal passive components to do the same. Power amplifiers require inductors with small form factors, high quality factors, and high operating frequency in the single-digit GHz range. This work explores the use of magnetic materials to satisfy the needs of power amplifier inductor applications. This paper discusses the optimization choices regarding material selection, device design, and fabrication methodology. The inductors achieved here present the best performance to date for an integrated magnetic core inductor at high frequencies with a 1 nH inductance and peak quality factor of 4 at ∼3 GHz. Such compact inductors show potential for efficiently meeting the need of mobile electronics in the future.

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Section: Resultsmentioning

confidence: 62%

Section: Inductance and Bandwidthmentioning

confidence: 99%

Gigahertz-Band Integrated Magnetic Inductors

El‐Ghazaly

White

Wang

2017

IEEE Trans. Microwave Theory Techn.

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show abstract

“…For instance, while the solenoid inductor design is discussed in great detail in this paper, by simply changing the dimensions of the magnetic core, the model can also be used to predict the inductance of the equally popular spiral inductor topology. Spiral inductors have been shown experimentally to have large inductance enhancements due to the use of closed-loop magnetic cores [18], the analytical model described here provides a direct prediction of how much. In order to do so, however, the analytical model must tackle the question of non-isotropic permeability; although the model was derived with the assumption of isotropic permeability, it is, in fact, capable of also describing films with non-isotropic permeability.…”

Section: Discussionmentioning

confidence: 97%

Closed-loop model: An optimization of integrated thin-film magnetic devices

El‐Ghazaly

Sato

White

et al. 2017

Journal of Magnetism and Magnetic Materials

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A generic analytical model has been developed to fully describe the flux closure through magnetic inductors. The model was applied to multiple device topologies including solenoidal single return path and dual return path inductors as well as spiral magnetic inductors for a variety of permeabilities and dimensions. The calculated inductance values from the analytical model were compared with simulated results for each of the analyzed device topologies and found to agree within 0.1 nH for the range of typical thinfilm magnetic permeabilities (∼ 10 2 − 10 3). Furthermore, the model can be used to evaluate behavior in other integrated or discrete magnetic devices with either non-isotropic or isotropic permeability and used to produce more efficient device designs in the future.

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“…Furthermore, nanostructure magnetic material also has high resistivity and hence is more likely to contact the coils directly and forms a fully filled magnetic structure [37][38][39], which will take advantage of magnetic flux enhancement effect in the maximum degree. Application of the ferrite nanomaterial shows a great prospect in RF on-chip inductors [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Application of Ferrite Nanomaterial in RF On‐Chip Inductors

Cai

Zhan

Yang

et al. 2013

Journal of Nanomaterials

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Several kinds of ferrite-integrated on-chip inductors are presented. Ferrite nanomaterial applied in RF on-chip inductors is prepared and analyzed to show the properties of high permeability, high ferromagnetic resonance frequency, high resistivity, and low loss, which has the potential that will improve the performance of RF on-chip inductors. Simulations of different coil and ferrite nanomaterial parameters, inductor structures, and surrounding structures are also conducted to achieve the trend of gains of inductance and quality factor of on-chip inductors. By integrating the prepared ferrite magnetic nanomaterial to the on-chip inductors with different structures, the measurement performances show an obvious improvement even in GHz frequency range. In addition, the studies of CMOS compatible process to integrate the nanomaterial promote the widespread application of magnetic nanomaterial in RF on-chip inductors.

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Ferromagnetic RF Integrated Inductor with Closed Magnetic Circuit Structure

Cited by 23 publications

References 5 publications

Gigahertz-Band Integrated Magnetic Inductors

Gigahertz-Band Integrated Magnetic Inductors

Closed-loop model: An optimization of integrated thin-film magnetic devices

Application of Ferrite Nanomaterial in RF On‐Chip Inductors

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