• 전자공학회논문지
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• 제52권5호
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• pp.74-82
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• 2015

전자장치의 복잡도 증가와 전원 전압 감소 추세에 따라, 내부 또는 외부에서 발생되는 노이즈에 대한 칩 또는 모듈의 전자기 내성 평가는 필수적이다. 칩 레벨 EMS 표준 시험방법으로 IEC 62132-4의 Direct Power Injection(DPI) 방법이 있지만, 실제 칩 내성은 모듈 상 보드 PDN 구조에 영향 받는다. 이 논문에서는 PLL의 내성을 평가하고 보드의 PDN 구조에 따른 잡음 전달 특성을 비교하였다. 여러 PDN을 만들기 위해 다양한 값의 커패시터들과 LDO 사용 유무 조건이 적용되었다. IC의 전자기 요구사항과 IC 및 보드로 구성된 모듈의 전자기 요구사항 간 불일치를 평가하기 위해, PDN들에 따른 노이즈 전달 특성을 분석하는 것은 강건한 EM 특성을 갖도록 설계하는데 중요한 정보를 줄 수 있음을 보였다. DPI 측정 결과는 LDO 사용에 따라 PLL 저주파 영역의 내성이 크게 개선되었음을 보여주며, DPI에 따른 PLL의 주파수 변화를 TEM cell 스펙트럼 측정으로도 확인 할 수 있었다.

• 전력전자학회논문지
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• 제10권2호
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• pp.109-116
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• 2005

최근 각종 산업기기 및 자동화기기에는 회전자가 영구자석으로 구성된 브러시리스 전동기의 사용이 증가하고 있다. 그러나 회전자가 영구자석으로 이루어진 BLDC전동기의 경우 회전자 위치 판별 센서는 필수 요소이다. PM BLDC 전동기의 속도제어를 수행함에 있어 기존의 엔코더와 Hall-IC 3개를 이용하지 않고, 2개의 Hall-IC로 3상 motor의 나머지 한상의 Hall-IC 신호를 추정하였다. 또한 사용된 PM BLDC motor는 고속속도를 가지는 특성을 가지고 있지만 Hall-IC를 이용하여 속초제어를 하기 때문에 속도의 오차 량이 상당히 크다는 단점을 가지고 있다. 따라서 이러한 단점을 개선하기 위해 저가의 PLL회로를 적용하였다. 또한 실험을 통하여 그 타당성을 검증하였다.

• 전자공학회지
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• 제31권9호
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• pp.90-108
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• 2004

• 전자공학회지
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• 제3권3호
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• pp.46-53
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• 1976

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.533-534
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• 2008

This paper presents a multi-phase ring VCO for low-cost, low-power GPS receiver. In the RF band used in GPS, L1 band is now in commercial-use and L2,L5 are predicting to be commercial-use soon. Thus Wide band PLL and Cost-effective IC solutions are required for future multi-band GPS receiver that received three types band at once. A new PLL architecture for multi-band GPS application is proposed. Ring VCO is even smaller than LC-VCO and a good alternative for low-cost solution. Proposed multi-phase ring VCO offers wide frequency range covering L1, L2, and L5 band, 20% reduction of area, 23% reduction of PLL power and can generate I/Q without extra I/Q generator.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2568-2571
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• 2002

A LCD backlight inverter control IC based on the piezoelectric transformer (PZT) for Cold Cathode Fluorescent Lamp (CCFL) lighting is proposed. It is indeed a variable frequency, variable duty (VFVD) controller having dual feedback control loops for achieving both the regulation of lamp current and the maximum efficiency. The PWM controller regulates the lamp current, while the PLL controller tunes the operating frequency to the frequency that the efficiency of the combined LC-PZT resonator becomes maximum. The mixed PLL/PWM control technique lets the backlight inverter operate at the maximum efficiency in spite of the variation of component and environment. The controller features include a protection for an open or broken lamps, and an open lamp regulation.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.277-280
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• 2005

In this paper, we propose a frequency synthesizer for dualband repeater. The dual-band RF technology for applications to the wireless repeater for CDMA and WCDMA mobile communications has been developed in this paper. The dualband PLL module consisted of dual-band VCO and one PLL IC has been developed. The main technological efforts for the dual-band PLL module is to suppress the intermodulation distortion by applying the miniature ceramic filter using the slow wave characteristics. The dual-band miniature RF module including dual-band PLL module and one MCU controller is very attractive for applications to the miniature dual-band RF mobile repeaters.

• Journal of Yeungnam Medical Science
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• 제6권2호
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• pp.217-222
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• 1989

In this study, high frequency oscillatory ventilator was designed and constructed. Using designed by phase-lock loop system, in order to accurately and easily treat both the outlet volume and rpm. A system has been designed and is being evaluated using CD4046A PLL IC. We use this PLL IC for the purpose of motor controls. The device consists of PLL system, pumping mechanism, piston, cylinder, and special crank shaft are required. This system characteristics were as follows : 1) Frequency : 20-1800rpm. 2) Outlet air volume : 1-50cc.

• Journal of Power Electronics
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• 제12권6호
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• pp.886-894
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• 2012

This paper presents a secondary-side, dual-mode feedback LLC resonant controller IC with dynamic PWM dimming for LED backlight units. In order to reduce the cost, master and slave outputs can be generated simultaneously with a single LLC resonant core based on dual-mode feedback topologies. Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) schemes are used for the master stage and slave stage, respectively. In order to guarantee the correct dual feedback operation, Phased-Locked Loop (PLL)-based automatic duty control circuit is proposed in this paper. The chip is fabricated using $0.35{\mu}m$ Bipolar-CMOS-DMOS (BCD) technology, and the die size is $2.5mm{\times}2.5mm$. The frequency of the gate driver (GDA/GDB) in the clock generator ranges from 50 to 425 kHz. The current consumption of the LLC resonant controller IC is 40 mA for a 100 kHz operation frequency using a 15 V supply. The duty ratio of the slave stage can be controlled from 40% to 60% independent of the frequency of the master stage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.874-877
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• 1987

In this paper a DPLL circuit realizable by digital IC's is propose and the principles of general DPLL are described. An all Digital phase locked loop is designed, analyzed, and tested. In particular, the approach of invoking Gaussian assumption on the decision variable and based on S.O.Rices theory is used. As a performance of the above PLL detector operating on low data rate FSK is given and demonsrtated to be FSK reception.