• 제목/요약/키워드: power matching

검색결과 755건 처리시간 0.028초

2단 CMOS Class E RF 전력증폭기 (Two Stage CMOS Class E RF Power Amplifier)

  • 최혁환;김성우;임채성;오현숙;권태하
    • 한국정보통신학회논문지
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    • 제7권1호
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    • pp.114-121
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    • 2003
  • 본 연구에서는 ISM 밴드의 블루투스 응용을 위한 2단 CMOS E급 전력증폭기를 설계하였다. 제안된 전력증폭기는 2.4GHz의 주파수에서 동작하며 0.35um CMOS기술과 Hspice 툴을 이용하여 설계 및 시뮬레이션 되었고 Mentor 툴을 이용하여 레이아웃되었다. 전력증폭기의 구조는 간단한 2단으로 설계하였다. 첫단에는 입력매칭네트웍과 전압증폭단인 전치증폭기로, 둘째단은 최대효율과 최대전력을 위한 E급 전력증폭단과 출력 매칭네트웍으로 구성하였다 내부단은 가장 간단한 구조의 L구조의 매칭네트웍을 이용하여 제작될 전체칩의 크기를 최소화하였다. 본 연구에서 제안된 전력증폭기는 2.4GHz의 동작주파수와 2.5V의 낮은 공급전압에서 25.4dBm의 출력전력과 약 39%의 전력부가효율을 얻을 수 있었다. 패드를 제외한 칩의 크기는 약 0.9${\times}$0.8(mm2)였다.

A Study of Impedance Matching Circuit Design for PLC

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
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    • 제7권4호
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    • pp.453-458
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    • 2009
  • This paper presents two methods of designing a Broadband Impedance Matching (BIM) circuit for maximizing a power line communication (PLC) equipment (or Modem) signal injection into its load at any power line connection port. This optimal (BIM) circuit design is achieved in two phases: Butterworth gain function and Tchebycheff gain function. According to the comparison of simulation and practical results, the performances of two gain functions on BIM are discussed.

임피던스 정합장치 내 위상센서를 이용한 RF정합 알고리즘 연구 (RF Impedance Matching Algorithm Using Phase Detector)

  • 김황규;양진우;강석호;최대호;홍상진
    • 반도체디스플레이기술학회지
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    • 제21권2호
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    • pp.32-37
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    • 2022
  • As semiconductors become finer, equipment must perform precise and accurate processes to achieve the desired wafer fabrication requirement. Radio frequency power delivery system in plasma system plays a critical role to generate the plasma, and the role of impedance matching unit is critical to terminate the reflected radio frequency power by modifying the impedance of the matching network in the plasma equipment. Impedance matching unit contains one fixed inductor and two variable vacuum capacitors whose positions are controlled two step motors. Controlling the amount of vacuum variable capacitor should be made as soon as possible when the mismatched impedance is detected. In this paper, we present the impedance matching algorithm using the phase sensor.

Measurement of Sonobuoy Transmitting Antenna System for Anti-Submarine Warfare

  • Min Kyeong-Sik
    • Journal of electromagnetic engineering and science
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    • 제5권2호
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    • pp.97-103
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    • 2005
  • This paper describes the measured results of sonobuoy transmitting antenna system for anti-submarine warfare (ASW). Since radiation pattern and power density depend on impedance matching between transmitting RF part and antenna with termination resistance, design of matching circuit is very important for sonobuoy system performance. Matching circuit is designed by Smith chart using control of L and C. In standing wave ratio(SWR) measurement using Network Analyzer, SWR of antenna with matching circuit observed 1.5 below at the assigned VHF band. It shows very excellent performance comparison with conversional product that is used for the same object. The measured vertical and horizontal radiation patterns are also shown the satisfaction of military specifications. A drop out of sonobuoy system on the sea is happened when angle of elevation direction is over 10 degrees, and it is conformed that it takes less than I second return to original signal level. The required electric power density is $83\;mW/m^2$ in the military specification, and measured electric power density is observed over average $110\;mW/m^2$ at all frequency bands.

Power Transmission Determined by the Mutual Impedance and the Transducer Power Gain in the Near Field Region

  • Kim, Che-Young
    • Journal of electromagnetic engineering and science
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    • 제11권3호
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    • pp.152-155
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    • 2011
  • This paper describes the role of mutual impedance and the transducer power gain which comes from key parameters to determine the amount of wireless power especially in a near-field environment. These two key parameters are applied to the two configurations; one is a dipole-dipole, and the other is a dipole-metal plate-loop configuration. Discussions are given on the achievable maximum power transfer between the sender and the receiver affected by the matching and the pass blockage.

Conservative Approximation-Based Full-Search Block Matching Algorithm Architecture for QCIF Digital Video Employing Systolic Array Architecture

  • Ganapathi, Hegde;Amritha, Krishna R.S.;Pukhraj, Vaya
    • ETRI Journal
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    • 제37권4호
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    • pp.772-779
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    • 2015
  • This paper presents a power-efficient hardware realization for a motion estimation technique that is based on the full-search block matching algorithm (FSBMA). The considered input is the quarter common intermediate format of digital video. The mean of absolute difference (MAD) is the distortion criteria employed for the block matching process. The conventional architecture considered for the hardware realization of FSBMA is that of the shift register-based 2-D systolic array. For this architecture, a conservative approximation technique is adapted to eliminate unnecessary MAD computations involved in the block matching process. Upon introducing the technique to the conventional architecture, the power and complexity of its implantation is reduced, while the accuracy of the motion vector extracted from the block matching process is preserved. The proposed architecture is verified for its functional specifications. A performance evaluation of the proposed architecture is carried out using parameters such as power, area, operating frequency, and efficiency.

Frequency Tuning Characteristics of a THz-wave Parametric Oscillator

  • Li, Zhongyang;Bing, Pibin;Xu, Degang;Yao, Jianquan
    • Journal of the Optical Society of Korea
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    • 제17권1호
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    • pp.97-102
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    • 2013
  • Frequency tuning characteristics of a THz-wave by varying phase-matching angle and pump wavelength in a noncollinear phase-matching THz-wave parametric oscillator (TPO) are analyzed. A novel scheme to realize the tuning of a THz-wave by moving the cavity mirror forwards and backwards is proposed in a noncollinear phase-matching TPO. The parametric gain coefficients of the THz-wave in a $LiNbO_3$ crystal are explored under different working temperatures. The relationship between the poling period of periodically poled $LiNbO_3$ (PPLN) and the THz-wave frequency under the condition of a quasi-phase-matching configuration is deduced. Such analyses have an impact on the experiments of the TPO.

3-dB Coupler Tuner를 이용한 초고주파 발진기의 출력 정합회로 설계에 관한 연구 (A Study on the Design of Microwave Oscillator Output Matching Circuit Using 3-dB Coupler Tuner)

  • 이석기;오재석;이영순;김병철
    • 한국전자파학회논문지
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    • 제9권2호
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    • pp.171-178
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    • 1998
  • 일반적으로 발진기 설계에서 출력에 가장 큰 영향을 미치는 부분이 출력단 정합부분인데 기존의 출력단 정합 방법은 스미스차트의 무한대 임피던스 근방에서 정합회로를 설계해야 하므로 최적의 출력 정합회로를 구현해 주기가 어렵다. 본 논문에서는 초고주파 발진기를 설계하는데 있어서 보다 쉽게 최대 발진출력을 얻기 위한 출력단 정합방법에 관하여 연구하였다. 출력단이 정합되지 않은 발진기에 3-dB Coupler Tuner를 연결하고 발진기가 동작하고 있는 상태에서 Tuner 의 가변 단락회로를 조정하여 최대출력이 나오는 지점을 확인하고, Tuner의 S 파라미터를 측정한 후 이를 마이 크로스트립으로 구현하는 벙법을 이용하여 최대 발진출력이 나오는 발진기를 쉽게 설계 제작할 수 있었다. 본 논문에서 제안한 방법으로 설계 제작한 발진기 출력과 기존 정합방법에 의한 발진기 출력을 비교해 보면, 기존의 정합방법에 의한 발진기 출력은 발진주파수 1.0338 GHz에서 6.45 dBm을 나타내었고, 본 논문에서 제시 한 방법으로 제작된 발진기의 출력은 9.71 dBm으로 기존의 정합방법에 의한 발진기 출력보다 3.26 dBm 높은 출력을 나타내었다.

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Joint Subcarrier Matching, Power Allocation and Bit Loading in OFDM Dual-Hop Systems

  • Kong, Hyung-Yun;Lee, Jin-Hee
    • Journal of electromagnetic engineering and science
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    • 제10권2호
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    • pp.50-55
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    • 2010
  • Orthogonal Frequency Division Multiplexing(OFDM) dual-hop systems can take full advantages of the techniques of both multi-hop communication and OFDM. To achievethis end, we propose a joint subcarrier matching, power allocation and bit loading algorithm operating under a total power constraint and the same Bit Error Rate(BER) threshold over all subcarriers. Simulation results demonstrated system throughput improvement compared to single-hop systems and dual-hop systems with different bit loading algorithms for each relay position, power constraint, and required BER.

대기압 플라즈마 전원장치의 반응기 파라메터에 관한 연구 (The study on Reactor Parameters of Atmosphere Plasma Power Supply)

  • 이우철;이택기
    • 조명전기설비학회논문지
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    • 제26권6호
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    • pp.59-65
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    • 2012
  • This paper presents a digital control solution which can extract the reactor parameters in atmosphere plasma power supply. The critical issue of the atmosphere plasma power supply is a impedance matching. For the impedance matching, the reactor parameters should be known, but the parameters depend on the reactors. Therefore, the reactor parameters have to measure for the impedance matching. The proposed method is performed by detection of phase difference between inverter voltage and current, and extraction of impedance through active, reactive power.