• Title/Summary/Keyword: Nano-Electronics

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Design of a Charge Pump Circuit Using Level Shifter for LED Driver IC (LED 구동 IC를 위한 레벨 시프터 방식의 전하펌프 회로 설계)

  • Park, Won-Kyeong;Park, Yong-Su;Song, Han-Jung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.1
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    • pp.13-17
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    • 2013
  • In this paper, we designed a charge pump circuit using level shifter for LED driver IC. The designed circuit makes the 15 V output voltage from the 5 V input in condition of 50 kHz switching frequency. The prototype chip which include the proposed charge pump circuit and its several internal sub-blocks such as oscillator, level shifter was fabricated using a 0.35 um 20 V BCD process technology. The size of the fabricated prototype chip is 2,350 um ${\times}$ 2,350 um. We examined performances of the fabricated chip and compared its measured results with SPICE simulation data.

A Study on the Machinability of Micro-Channel (마이크로 채널의 가공성에 관한 연구)

  • Hong, Min-Sung;Kim, Jong-Min
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.2
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    • pp.51-57
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    • 2008
  • Recently, the manufacturer of microscopic structures along with the development of technology to produce electronics, communication and semiconductors allows various components to be smaller in size, with higher precision. Therefore, preoccupancy of micro/nano-level machining technology in order to product micro/nano-components and parts is key issue in the field of manufacturing. In this study, machinability of micro machining was studied through the machining of aluminum, brass and steel workpiece. Inspection of the cutting force variation patterns of large numbers of micro machining indicated that characteristics of the workpiece. Surface roughness prediction methods were developed by considering the variation of the static part of the feed direction cutting force. The accuracy of the proposed approaches were tested with experimental data and the agreement between the predictions and actual observations are addressed.

A Study on Application of Inductive PLC to Electric Charging System (유도형 전력선 통신의 전기충전시스템 적용 연구)

  • Sohn, Kyung-Rak;Jeong, Jae-Hwan;Yang, Seung-Ho
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.05a
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    • pp.153-153
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    • 2018
  • In this paper, we have represented basic experiment results for the application of electric vehicle powerline communication using an induction type coupler. The coupler was fabricated using nano-crystalline alloy and it was applied to the charging system of electric vehicles to measure the communication performance. Experimental results showed a channel bandwidth over 48 Mbps.

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PCB Embedded Spiral Inductors for low cost RF SOP Applications (저가형 RF SOP 응용을 위한 임베디드 인덕터에 관한 연구)

  • Lee, Hwan-H.;Park, Jae-Y.;Lee, Han-S.
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1301-1302
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    • 2006
  • In this paper, embedded spiral inductors are investigated into the PCB substrate for low cost RF SOP applications. The spiral inductors designed with geometrical variations were simulated, fabricated, measured, and characterized by using 3D EM simulator, 8 layered PCB standard process and HP 8510B network analyzer (or verifying their applicability. The fabricated embedded spiral inductor has inductance of 9.4 nH at 800MHz, maximum quality factor of 64.8 at 1.09GHz and self resonant frequency of 3.93GHz, respectively. As the measured inductances and quality factors are well matched with simulated ones. PCB embedded spiral inductors are promising for advanced electronic systems with various functionality, low cost, small size and volume.

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Characterization of BTO based MIM Capacitors Embedded into Organic Packaging Substrate (유기 패키징 기판에서의 BTO 기반의 임베디드 MIM 커패시터의 특성 분석)

  • Lee, Seung-J.;Lee, Han-S.;Park, Jae-Y.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1504-1505
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    • 2007
  • In this paper, fully embedded high Dk BTO MIM capacitors have been developed into a multi-layered organic package substrate for low cost RF SOP (System on Package) applications. These embedded MIM capacitors were designed and simulated by using CST 3D EM simulators for finding out optimal geometries and verifying their applicability. The embedded MIM capacitor with a size of $550\;{\times}\;550\;um^2$ has a capacitance of 5.3pF and quality factor of 43 at 1.5 GHz, respectively. The measured performance characteristics were well matched with 3D EM simulated ones. Equivalent circuit parameters of the embedded capacitors were extracted for making a design library.

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Design and Fabrication of Miniaturized LC Diplexer Embedded into Organic Substrate (적층 유기기판 내에 내장된 소형 LC 다이플렉서의 설계 및 제작)

  • Lee, Hwan-H.;Park, Jae-Y.;Lee, Han-S.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.262-263
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    • 2007
  • In this paper, fully embedded and miniaturized diplexer has been designed, fabricated, and characterized for dual-band/mode CDMA handset applications. The size of the embedded diplexer is significantly reduced by embedding high Q circular spiral inductors and high DK MIM capacitors into low cost organic package substrate. The fabricated diplexer has insertion losses and isolations of -0.5 and -23dB at 824-894MHz and -0.7 and -22dB at 1850-1990MHz, respectively. Its size is 3.9mm$\times$3.9mm$\times$ 0.77mm (height). The fabricated diplexer is the smallest one which is fully embedded into low cost organic package substrate.

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Silver nano-ink formulation based on alcohol and its application to inkjet printing (알코올 용제의 은 나노 잉크 제조와 프린팅 기술의 응용)

  • Cho, Hye-Jin;Kim, Tae-Hoon;Joung, Jae-Woo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.551-552
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    • 2006
  • This study was attended to demonstrate synthesis of silver nanoparticles stabilized with polymer and their applicability to printed electronics. Silver nanoparticles were synthesized by reduction of silver nitrate in aqueous solution in the presence of polyvinyl pyrrolidone (PVP) as a stabilizer. The ink used here is composed of 50 wt% Ag NP, 15 wt% humectant and then were printed on polyimide film. Particle deposit morphologies were controlled by varying the ink compositions. Printed silver patterns and dots were cured on a convection oven in air at $300^{\circ}C$ for 60 min. The printed patterns show good shape definition and the resistivity of the printed films is about $5{\mu}{\Omega}{\cdot}cm$.

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80kW SiC Bi-directional Converter using DC Droop Control in DC Nano-grid (DC Nano-grid에서 DC Droop Control을 적용한 80kW급 SiC 양방향 컨버터)

  • Park, Sungyoul;Kim, Yeonwoo;Kwon, Minho;Choi, Sewan;Jung, Sehyoung;Kim, Minkook;Oh, Seongjin
    • Proceedings of the KIPE Conference
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    • 2016.11a
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    • pp.17-18
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    • 2016
  • 본 논문에서는 DC droop control을 적용한 80kW급 SiC 양방향 컨버터를 제안한다. 시스템은 20kW 모듈 4개를 이용하는 모듈형 컨버터이며, 토폴로지는 넓은 입력전압 범위를 만족하기 위하여 Cascade 부스트-벅 컨버터 구조이다. 모듈 컨버터의 제어는 모듈 간 통신이 필요 없는 DC droop control에 부하분담과 전압 regulation 성능을 모두 향상시키기 위하여 Secondary control을 적용했다. 제안하는 시스템의 타당성을 검증하기 위하여 20kW급 시작품 2대 실험을 통해 병렬 운전을 검증하였으며, 14kW에서 최고 효율 98.9%를 달성하였다.

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Wettability Evaluation by Wetting Balance Test and Wetting Characteristics of Solders (웨팅밸런스법을 통한 젖음성 평가와 솔더의 젖음 특성)

  • Jeon, Wook Sang;Rajendran, Sri Harini;Jung, Jae Pil
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.3
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    • pp.1-6
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    • 2019
  • Wettability is an important factor to decide solderability of solder, flux, other soldering-related materials and soldering conditions. The wettability also affects the reliability of solder joint. Wetting balance test is a good method for quantitatively measuring wettability between solder and substrate. The wetting balance test is easy to reproduce the wetting experiment and to measure the wetting time and force. And this test provides wetting curve to calculate the surface tension of the molten solder. Development of new solder has been continued in accordance with various and harsh environment in the electronics industry. In this paper, the principle of wetting balance test and recent research issues including nano-composite solder are explained.

Methods to Formulate Waterborne Conjugated Polymer Nanoparticles (수분산 공액고분자 나노입자의 합성 방법론)

  • Seungju Kang;Boseok Kang
    • Journal of Adhesion and Interface
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    • v.24 no.1
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    • pp.1-8
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    • 2023
  • A conjugated polymer is the next-generation emerging semiconductor material that can be applied in various fields, from organic electronics to biomedical applications. However, its low solubility in an aqueous medium has made the use of toxic organic solvents inevitable, thereby leading to formulation of conjugated polymers in the form of waterborne nanoparticles. This review paper discusses two principles of nanoparticle formation and representative methods for synthesizing conjugated polymer nanoparticles.