• Title/Summary/Keyword: 2-루프 구조

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Design of a Ultra Miniaturized Voltage Tuned Oscillator Using LTCC Artificial Dielectric Reson (LTCC 의사 유전체 공진기를 이용한 초소형 전압제어발진기 설계)

  • Heo, Yun-Seong;Oh, Hyun-Seok;Jeong, Hae-Chang;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.5
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    • pp.613-623
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    • 2012
  • In this paper, we present an ultra miniaturized voltage tuned oscillator, with HMIC-type amplifier and phase shifter, using LTCC artificial dielectric resonator. ADR which consists of periodic conductor patterns and stacked layers has a smaller size than a dielectric resonator. The design specification of ADR is obtained from the design goal of oscillator. The structure of the ADR with a stacked circular disk type is chosen. The resonance characteristic, physical dimension and stack number are analyzed. For miniaturization of ADRO, the ADR is internally implemented at the upper part of the LTCC substrate and the other circuits, which are amplifier and phase shifter are integrated at the bottom side respectively. The fabricated ADRO has ultra small size of $13{\times}13{\times}3mm^3$ and is a SMT type. The designed ADRO satisfies the open-loop oscillation condition at the design frequency. As a results, the oscillation frequency range is 2.025~2.108 GHz at a tuning voltage of 0~5 V. The phase noise is $-109{\pm}4$ dBc/Hz at 100 kHz offset frequency and the power is $6.8{\pm}0.2$ dBm. The power frequency tuning normalized figure of merit is -30.88 dB.

Area Efficient Hardware Design for Performance Improvement of SAO (SAO의 성능개선을 위한 저면적 하드웨어 설계)

  • Choi, Jisoo;Ryoo, Kwangki
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.2
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    • pp.391-396
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    • 2013
  • In this paper, for HEVC decoding, an SAO hardware design with less processing time and reduced area is proposed. The proposed SAO hardware architecture introduces the design processing $8{\times}8$ CU to reduce the hardware area and uses internal registers to support $64{\times}64$ CU processing. Instead of previous top-down block partitioning, it uses bottom-up block partitioning to minimize the amount of calculation and processing time. As a result of synthesizing the proposed architecture with TSMC $0.18{\mu}m$ library, the gate area is 30.7k and the maximum frequency is 250MHz. The proposed SAO hardware architecture can process the decode of a macroblock in 64 cycles.

Full-Scale Test on Precast Concrete Arch Bridge with Reinforced Joint and Backfill (보강된 이음부와 뒤채움을 적용한 조립식 프리캐스트 콘크리트 아치교량의 실물모형실험)

  • Chung, Chulhun;Joo, Sanghoon;Choi, Dongchan;Lee, Jongyun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.34 no.2
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    • pp.389-402
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    • 2014
  • In this paper, the load test of full-scale precast concrete arch bridges considering reinforced joint and backfill was conducted. It is an improved method that the reinforced joint enhanced the structural performance of conventional masonry arch system which was proposed by previous researchers. The models of full-scale test are $10m(span){\times}3m$ (rise) and $10m(span){\times}2m$ (rise), which are 2 meters in width. The critical load position was shown at a third-span from the results of the pre-analysis. Based on the this results, the positions of load, measuring items and points were determined in experiments. As a result, the maximum load capacity of the specimen $10m{\times}2m$, a relatively small rise to span ratio (compared to the specimen $10m{\times}3m$), was higher than the specimen $10m{\times}3m$. It was evaluated that all the specimens have sufficient structural performance on the design load.

A Study on Improving Performance of the Vehicular WAVE Antenna System using the EBG structure for ITS wireless communications (동향분석ITS 무선통신을 위한 EBG 구조를 적용한 자동차용 WAVE 안테나 시스템 성능향상연구)

  • Yeon, KyuBong;Lee, DuHo;Hwang, JinKyu;Yang, TaeHoon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.16 no.1
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    • pp.176-185
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    • 2017
  • This paper describes a design of the WAVE antenna system in V2X wireless communication systems for Intelligent Transport Systems. The WAVE standard protocols defined 5.825~5.9GHz frequency range for wireless communications with V2X. In a recent, A study of WAVE communication system it has been studied mainly the base station and the OBU technology in order to improve the communication performance of the communication distance. In this paper, the proposed vehicular WAVE antenna using the EBG structure is to improve performance. The proposed WAVE antenna with EBG shows improvement of return loss and radiation beam pattern. The performance of WAVE communication systems for intelligent transport systems is dependent on the performance of antenna. The proposed vehicular antenna for WAVE communication systems shows improvement of return loss for performance.

Equivalence Between Two Orthogonal Oriented Circular Loops and Planar Inveryed-F Antenna Array (직교형 원형 루프 안테나와 역 에프형 배열구조의 등가성 분석)

  • Kim, Jong-Sung;Park, Seung-Mo;Choi, Won-Kyu;Seong, Nak-Seon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.289-292
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    • 2005
  • Two planar inverted-F antenna (PIFA) arrays are proposed as an alternative model to generate input and radiation characteristics of two orthogonal oriented circular loops, which has polarization diversity, but inherent mechanical instability of two orthogonal loops, in particular, in installation and operation conditions. Two $1\times2$ PIFA sub-arrays are orthogonally placed on a ground plane and two different feeding networks are applied to control horizontal and vertical radiation current flows for each sub-array, respectively. Equivalence of scattering parameters and radiation patterns between two antennas are validated by the available commercial simulator.

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System Thinking Perspective on the Dynamic Relationship between Spatial Characteristics of Compact City and Urban Sustainability (시스템사고로 본 압축도시의 공간적 특성과 지속가능성과의 동태적 관계)

  • Kim, Lee-Young;Moon, Tae-Hoon
    • Korean System Dynamics Review
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    • v.11 no.2
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    • pp.5-28
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    • 2010
  • The purpose of this paper is to review relationship between spatial characteristics of compact city and urban sustainabiliy from system dynamics perspective using causal loop analysis. It has been argued that spatial characteristics of compact city, high population density and mixed land use, are positively related to urban sustainability. However, research results that are not consistent with pros of compact city argument have been accumulated too. It is especially true when spatial characteristics of compact city are examined with regard to each dimension of sustainablility: economic, social, and environmental sustainability. Reviewing each dimension of sustainability with regard to spatial characteristics based on causal loop analysis, this paper provides more clear understanding on relationship between compact city and sustainability. Also this paper provides a base for system dynamics simulation for future study.

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Structural Characteristic Analysis of a High-Precision Centerless Grinding Machine with Concrete-Filled Bed (콘크리트 층진 베드를 적용한 초정밀 무심 연삭기의 구조 해석)

  • Kim Seok Il;Cho Jae Wan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.2
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    • pp.172-179
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    • 2005
  • A high-precision centerless grinding machine has been recognized as a core equipment performing the finish outer-diameter grinding process of ferrules which are widely used as fiber optic connectors. In this study, in order to realize the high-precision centerless grinding machine, the structural characteristic analysis and evaluation are carried out on the virtual prototype consisted of the steel bed, hydrostatic GW and RW spindle systems, hydrostatic RW feed mechanism, RW swivel mechanism, and on-machine GW and RW dressers. The loop stiffnesses of centerless grinding machine are estimated based on the relative deformations between GW and RW caused by the grinding forces. And the simulated results illustrate that the concrete-filled bed has the considerable effect on the improvement of the structural stiffness of centerless grinding machine.

10-kV Bipolar Pulsed Power Modulator Based on Power Cell Structure (파워셀 구조 기반의 10kV 양극성 펄스 모듈레이터)

  • Song, Seung-Ho;Lee, Seung-Hee;Ryoo, Hong-Je
    • Proceedings of the KIPE Conference
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    • 2019.11a
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    • pp.49-51
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    • 2019
  • 본 논문은 고전압 양극성 펄스 모듈레이터에 대해 소개한다. 모듈레이터는 충전을 위한 공진형 컨버터와 고전압 펄스를 생성하기 위한 12개의 파워셀로 구성된다. 12개의 파워셀은 다중 권선 변압기를 통해 모든 셀이 병렬로 충전되며, 방전 시에는 모든 셀이 직렬로 연결되어 고전압을 생성한다. 12개의 파워셀을 구성하는 48개의 스위치에 절연된 전력과 신호를 동시에 공급하기 위해, 2개의 고전압 케이블로 구성된 양극성 컨트롤 루프가 설계되었다. 최종적으로 10kV, 100A, 3kHz 사양을 갖는 양극성 펄스 모듈레이터가 구현되었으며, 저항부하 및 리액터 부하조건에서 테스트 되었다. 실험결과를 통해 제안하는 양극성 펄스 모듈레이터의 신뢰성이 검증되었다.

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A High-speed St Low power Design Technique for Open Loop 2-step ADC (개방루프를 이용한 고속 저전력 2스텝 ADC 설계 기법)

  • 박선재;구자현;윤재윤;임신일;강성모;김석기
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.4A
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    • pp.439-446
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    • 2004
  • This paper describes high speed and low power design techniques for an 8-bit 500MSamples/s CMOS 2-step ADC. Instead of the conventional closed-loop architecture, the newly proposed ADC adopts open-loop architecture and uses a reset-switch to reduce loading time in an environment of big parasitic-capacitances of mux-array. An analog-latch is also used to reduce power consumption. Simulation result shows that the ADC has the SNDR of 46.91㏈ with a input frequency of 103MHz at 500Msample/s and consumes 203㎽ with a 1.8V single power supply. The chip is designed with a 0.18mm 1-poly 6-metal CMOS technology and occupies active area of 760${\mu}{\textrm}{m}$*800${\mu}{\textrm}{m}$.

A Study on the Antenna for Mobile Communication (이동체 통신용 안테나에 관한 연구)

  • 고영혁;김재민;이종악
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.7 no.2
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    • pp.139-146
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    • 1996
  • In this paper, the total electric field antenna in the small loop and aperture plane structure to load a capacitance on transformed QMSA(Quarter-wavelength Microstrip Antenna) from MSA(Microstrip Antenna) is proposed, and the total electric field is shown that the calculated value is agreed resonably with experimental value. Itis a smalled antenna of the radiation element and ground plane with equal width. The designed and manufactured antenna can receive borth vertically and horizontally polarised waves to operating frequency of 1.5GHz; therefore this is available as a smalled antenna for wireless telephones and will be quit useful for indoor communication. Also, antenna's equivalent circuit with transmission line model is designed to find more accurate resonant frequency and is calculated return loss value. The calculated value is agreed resonably with experimental value.

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