• Title/Summary/Keyword: inductors

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Fabrication and Properties of Thin-Film Inductors with Magnetic Core (박막 자심 인덕터의 제조와 특성)

  • Kim, Hyun-Sik;Min, Bok-Ki;Byun, Woo-Bong;Kim, Ki-Uk;Song, Jae-Sung;Oh, Young-Woo
    • Proceedings of the KIEE Conference
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    • 1997.07d
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    • pp.1314-1316
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    • 1997
  • In this study, We fabricated thin film magnetic core inductors by using thin film manufacturing techniques such as photolithography and wet etching process. The inductors were prepared using multi-layered CoNbZr/Cu/CoNbZr. These devices are measured at high frequency range of $1\;MHz{\sim}1\;GHz$.

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Experimental Investigation of Differential Line Inductor for RF Circuits with Differential Structure

  • Park, Chang-kun
    • Journal of information and communication convergence engineering
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    • v.9 no.1
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    • pp.11-15
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    • 2011
  • A Differential line inductor is proposed for a differential power amplifier. The proposed differential line inductor is composed of two conventional line inductors rearranged to make the current direction of the two line inductors identical. The proposed line inductor is simulated with a 2.5-D and a 3-D EM simulator to verify its feasibility with the substrate information in a 0.18-${\mu}m$ RF CMOS process. The inductances of various line inductors implemented with printed circuit boards were measured. The feasibility of the proposed line inductor was successfully demonstrated.

The Impact of Parasitic Elements on Spurious Turn-On in Phase-Shifted Full-Bridge Converters

  • Wang, Qing
    • Journal of Power Electronics
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    • v.16 no.3
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    • pp.883-893
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    • 2016
  • This paper presents a comprehensive analysis of the spurious turn-on phenomena in phase-shifted full-bridge (PSFB) converters. The conventional analysis of the spurious turn-on phenomenon does not establish in the PSFB converter as realizing zero voltage switching (ZVS). Firstly, a circuit model is proposed taking into account the parasitic capacitors and inductors of the transistors, as well as the parasitic elements of the power circuit loop. Second, an exhaustive investigation into the impact of all these parasitic elements on the spurious turn-on is conducted. It has been found that the spurious turn-on phenomenon is mainly attributed to the parasitic inductors of the power circuit loop, while the parasitic inductors of the transistors have a weak impact on this phenomenon. In addition, the operation principle of the PSFB converter makes the leading and lagging legs have distinguished differences with respect to the spurious turn-on problems. Design guidelines are given based on the theoretical analysis. Finally, detailed simulation and experimental results obtained with a 1.5 kW PSFB converter are given to validate proposed analysis.

Transferrable single-crystal silicon nanomembranes and their application to flexible microwave systems

  • Seo, Jung-Hun;Yuan, Hao-Chih;Sun, Lei;Zhou, Weidong;Ma, Zhenqiang
    • Journal of Information Display
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    • v.12 no.2
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    • pp.109-113
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    • 2011
  • This paper summarizes the recent fabrication and characterizations of flexible high-speed radio frequency (RF) transistors, PIN-diode single-pole single-throw switches, as well as flexible inductors and capacitors, based on single-crystalline Si nanomembranes transferred on polyethylene terephthalate substrates. Flexible thin-film transistors (TFTs) on plastic substrates have reached RF operation speed with a record cut-off/maximum oscillation frequency ($f_T/f_{max}$) values of 3.8/12 GHz. PIN diode switches exhibit excellent ON/OFF behaviors at high RF frequencies. Flexible inductors and capacitors compatible with high-speed TFT fabrication show resonance frequencies ($f_{res}$) up to 9.1 and 13.5 GHz, respectively. Robust mechanical characteristics were also demonstrated with these high-frequency passives components.

Zero-Voltage-Transition Synchronous DC-DC Converters with Coupled Inductors

  • Rahimi, Akbar;Mohammadi, Mohammad Reza
    • Journal of Power Electronics
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    • v.16 no.1
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    • pp.74-83
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    • 2016
  • A new family of zero-voltage-transition converters with synchronous rectification is introduced in this study. Soft switching condition for all the converter operating points is provided in the proposed converters. The reverse recovery losses of the rectifier switch body diode are also eliminated. In comparison with the main switch voltage stress, the auxiliary switch voltage stress is reduced significantly. The auxiliary switch does not need the floating gate drive. The auxiliary inductor is coupled with the main converter inductor, and the leakage inductor is used as the resonance inductor. Thus, all inductors of the proposed converter can be implemented on a single core. The other features of the proposed converters include no extra voltage and current stresses on the main converter semiconductor elements. Theoretical analysis for a synchronous buck converter is presented in detail, and the validity of the theoretical analysis is justified with the experimental results of a prototype buck converter with 180 W and 80 V to 30 V.

Modeling of 3-D Embedded Inductors Fabricated in LTCC Process (저온 동시소성 공정으로 제작된 3차원 매립 인덕터 모델링)

  • 이서구;최종성;윤일구
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.4
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    • pp.344-348
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    • 2002
  • As microelectronics technology continues to progress, there is also a continuous demand on highly integration and miniaturization of systems. For example, it is desirable to package several integrated circuits together in multilayer structure, such as multichip modules, to achieve higher levels of compactness and higher performance. Passive components (i.e., capacitors, resistors, and inductors) are very important fort many MCM applications. In addition, the low-temperature co-fired ceramic (LTCC) process has considerable potential for embedding passive components in a small area at a low cost. In this paper, we investigate a method of statistically modeling integrated passive devices from just a small number of test structures. A set of LTCC inductors is fabricated and their scattering parameters (s-parameters) are measured for a range of frequencies from 50MHz to 5GHz. An accurate model for each test structure is obtained by using a building block based modeling methodology and circuit parameter optimization using the HSPICE circuit simulator.

A Study on the Expandable Bobbin Type Multiple Integrated Coupled-Inductor Applied 4-Pralleled Switching Rectifier (보빈 적층 방식의 다중 공유결합 인덕터를 이용한 4병렬 스위칭 정류기에 관한 연구)

  • Yoo, Jeong Sang;Ahn, Tae Young
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.4
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    • pp.18-24
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    • 2019
  • In this paper, expandable bobbin type multiple integrated coupled-inductor applied 4-paralled switching rectifier was proposed. To design the proposed inductor easily, inductance designing formula was derived through magnetic circuit analysis of the 4-paralleled integrated coupled-inductor. Furthermore, to verify practicality of the proposed inductor, it was applied in 600W class 4-paralleled interleaved switching rectifier, and the steady-state characteristics of the proposed inductor and discrete inductors were compared. Consequently, it was showed that the proposed inductor can replace the conventional discrete inductors with alternative electrical characteristic standard, hence miniaturization of the SMPS can be achieved. From the test result, test circuit with the proposed inductor showed maximum 97.1% of power conversion efficiency and under 18W of power loss where the circuit with discrete inductors showed 96.7% and 20W respectively.

Enhanced Parallel-Branch Spiral Inductors (병렬분기 방법을 이용한 박막 나선 인덕터의 특성 향상)

  • 서동우;민봉기;강진영;백문철
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.89-93
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    • 2002
  • In the present paper we suggested a parallel-branch structure of aluminum spiral inductor for the use of RF integrated circuit at 1∼3 GHz. The inductor was implemented on P-type silicon wafer (5∼15 Ω-cm) under the standard CMOS process and it showed a improved quality(Q) factor by more than 10% with no degradation of inductance. The effect of the structure modification on the Q factor and the inductance was scrutinized comparing with those of the conventional spiral inductors.

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Active-RC Circuit Synthesis for the Simulation of Current-Controllable Inductors and FDNRs

  • Park, Ji-Mann;Chung, Won-Sup;Kim, Hee-Jun
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.774-777
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    • 2002
  • A systematic synthesis process is described for the simulation of current-controllable inductors using operational transconductance amplifiers (OTAs). The process is used to obtain three circuits; two are believed to be novel. The process is also applied to design current-controllable frequency-dependent negative resistances (FDNRs). Operation principles of designed circuits are presented and experimental results are used to verify theoretical predictions. The results show close agreement between predicted behavior and experimental performance.

Physics-based Modeling of Low Temperature Co-fired Ceramic Helical Inductors (LTCC Helical 인덕터의 Physics-based 모델링)

  • Heo, Keun;Lim, Ju-Hwan;Hwang, Sung-Woo
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.601-602
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    • 2006
  • A physics-based equivalent circuit model for LTCC Helical type Inductors is presented. All of the electromagnetic couplings between conductors are included in the model and the number of optimized parameters is minimized. The model can predict the measured results upto 12 GHz.

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