• Title/Summary/Keyword: Phase-Lock Loop

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A Fast-Locking Fractional-N PLL with Multiple Charge Pumps and Capacitance Scaling Scheme (Capacitance Scaling 구조와 여러 개의 전하 펌프를 이용한 고속의 ${\Sigma}{\Delta}$ Fractional-N PLL)

  • Kwon, Tae-Ha
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.10 s.352
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    • pp.90-96
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    • 2006
  • A novel ${\Sigma}{\Delta}$ fractional-N PLL architecture for fast locking and fractional spur suppressing is proposed based on the capacitance scaling scheme. It changes the effective capacitance of loop filter (LF) by increasing and decreasing current to the capacitor via different paths with multiple charge pumps. The effective capacitance of loop filter (LF) can be scaled up/down depending on operating status while keeping LF capacitors small enough to be integrated into a single PLL chip. Fractional spurs suppressing have been achieved by reducing the magnitude of charge pump current when the PLL is in-lock without degrading fast locking characteristic. It has been simulated by HSPICE in a CMOS $0.35{\mu}m$ process, and shows flat locking time is less than $8{\mu}s$ with the small size of LF capacitors, 200pF and 17pF, and $2.8k{\Omega}$ resistor.

Design of Carrier Recovery Circuit for High-Order QAM - Part II : Performance Analysis and Design of the Gear-shift PLL with ATC(Automatic Transfer-mode Controller) and Average-mode-change Circuit (High-Order QAM에 적합한 반송파 동기회로 설계 - II부. 자동모드전환시점 검출기 및 평균모드전환회로를 적용한 Gear-Shift PLL 설계 및 성능평가)

  • Kim, Ki-Yun;Kim, Sin-Jae;Choi, Hyung-Jin
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.38 no.4
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    • pp.18-26
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    • 2001
  • In this paper, we propose an ATC(Automatic Transfer mode Controller) algorithm and an average-mode-change method for use in Gear shift PLL which can automatically change loop gain. The proposed ATC algorithm accurately detects proper timing or the mode change and has a very simpler structure - than the conventional lock detector algorithm often used in QPSK. And the proposed average mode change method can obtain low errors of estimated frequency offset by averaging the loop filter output of frequency component in shift register. These algorithms are also useful in designing ASIC, since these algorithms occupy small circuit area and are adaptable for high speed digital processing. We also present phase tracking performance of proposed Gear-shift PLL, which is composed of polarity decision PD, ATC and average mode change circuit, and analyze the results by examining constellation at each mode.

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Design of Clock and Data Recovery Circuit for 622Mbps Optical Network (622Mbps급 광 통신망용 버스트모드 클럭/데이터 복원회로 설계)

  • Moon, Sung-Young;Lee, Sung-Chul;Moon, Gyu
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.2
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    • pp.57-63
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    • 2009
  • In this Paper, a novel 622Mbps burst-mode clock and data recovery (CDR) circuit is proposed for passive optical network (PON) applications. The CDR circuit is composed of CDR(Clock and Data Recovery) block and PLL(Phase Locked Loop) block. Lock dynamics is accomplished on the first data transition and data are sampled in the optimal point. The CDR circuit is realized in 0.35um CMOS process technology. With input pseudo-random bit sequences(PRBS) of $2^7-1$, the simulations show 17ps peak-to-peak retimed data jitter characteristics. The experimental results show that the proposed CDR circuits are operating as expected, recovering an incoming 622Mbps burst-mode input data without errors.

Design and Modeling of a DDS Driven Offset PLL with DAC (DAC를 적용한 DDS Driven Offset PLL모델링 및 설계)

  • Kim, Dong-Sik;Lee, Hang-Soo;Kim, Jong-Pil;Kim, Seon-Ju
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.12 no.5
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    • pp.1-9
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    • 2012
  • In this paper, we presents the modeling and implementation of the DDS(Direct Digital synthesizer) driven offset PLL(Pghase Locked Loop) with DAC(Digital Analog Converter) for coarse tune. The PLL synthesizer was designed for minimizing the size and offset frequency and DDS technique was used for ultra low noise and fast lock up time, also DAC was used for coarse tune. The output phase noise was analyzed by superposition theory with the phase noise transfer function and noise source modeling. the phase noise prediction was evaluated by comparing with the measured data. The designed synthesizer has ultra fast lock time within 6 usec and ultra low phase noise performance of -120 dBc/Hz at 10KHz offset frequency.

Phase Locked VCDRO for the 20 GHz Point-to-point Radio Link (20 GHz 고정국용 위상고정 VCDRO)

  • 주한기;장동필
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.6
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    • pp.816-824
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    • 1999
  • Design and performance of 18 GHz phase locked dielectric resonator oscillator(PLDRO) for Point-to-point radio link using analog phase locked loop is described which achieve high stability and low SSB phase noise. The module consists of an 18 GHz voltage controlled dielectric resonator oscillator(VCDRO), buffered amplifier, analog phase detector which are integrated to form a miniature hybrid circuit. In addition, containing a low phase noise VHF PLL has been designed to lock any other conventional N times frequency of crystal oscillator. The module achieves stable phase locked state, exhibits output power of 21 dBm at 18.00 GHz, -34 dBc harmonic suppression and -75 dBc/Hz phase noise at 10 kHz offset frequency from carrier.

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A 285-fsrms Integrated Jitter Injection-Locked Ring PLL with Charge-Stored Complementary Switch Injection Technique

  • Kim, Sungwoo;Jang, Sungchun;Cho, Sung-Yong;Choo, Min-Seong;Jeong, Gyu-Seob;Bae, Woorham;Jeong, Deog-Kyoon
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.6
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    • pp.860-866
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    • 2016
  • An injection-locked ring phase-locked loop (ILRPLL) using a charge-stored complementary switch (CSCS) injection technique is described in this paper. The ILRPLL exhibits a wider lock range compared to other conventional ILRPLLs, owing to the improvement of the injection effect by the proposed CSCS. A frequency calibration loop and a device mismatch calibration loop force the frequency error to be zero to minimize jitter and reference spur. The prototype chip fabricated in 65-nm CMOS technology achieves a $285-fs_{rms}$ integrated jitter at GHz from the reference clock of 52 MHz while consuming 7.16 mW. The figure-of-merit of the ILRPLL is -242.4 dB.

Improvement of Phase Noise in Frequency Synthesizer with Dual PLL (이중 PLL 구조 주파수 합성기의 위상 잡음 개선)

  • Kim, Jung-Hoon;Park, Beom-Jun;Kim, Jee-Heung;Lee, Kyu-Song
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.9
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    • pp.903-911
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    • 2014
  • This paper proposes a high speed frequency synthesizer with dual phase-locked loop(PLL) structure to improve phase noise level and shape in a wideband receiver. To reduce phase noise and fractional spur, a output frequency of $1^{st}$ PLL used as reference frequency of $2^{nd}$ PLL is changed. The frequency synthesizer has been designed with 1 Hz frequency resolution using digital NCO in 6.5~8.5 GHz wide spectrum. The measured results of the fabricated frequency synthesizer show that the output power is about -3 dBm, the maximum lock-in time and phase noise are within 60 us and -95 dBc/Hz at 10 kHz offset, respectively.

A Study on Current Ripple Reduction Due to Offset Error in SRF-PLL for Single-phase Grid-connected Inverters (단상 계통연계형 인버터의 SRF-PLL 옵셋 오차로 인한 전류 맥동 저감에 관한 연구)

  • Hwang, Seon-Hwan;Hwang, Young-Gi;Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.11
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    • pp.68-76
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    • 2014
  • This paper presents an offset error compensation algorithm for the accurate phase angle of the grid voltage in single-phase grid-connected inverters. The offset error generated from the grid voltage measurement process cause the fundamental harmonic component with grid frequency in the synchronous reference frame phase lock loop (PLL). As a result, the grid angle is distorted and the power quality in power systems is degraded. In addition, the dq-axis currents in the synchronous reference frame and phase current have the dc component, first and second order ripples compared with the grid frequency under the distorted grid angle. In this paper, the effects of the offset and scaling errors are analyzed based on the synchronous reference frame PLL. Particularly, the offset error can be estimated from the integrator output of the synchronous reference frame PLL and compensated by using proportional-integral controller. Moreover, the RMS (Root Mean Square) function is proposed to detect the offset error component. The effectiveness of the proposed algorithm is verified through simulation and experiment results.

Current Control of a Single-phase PWM Converter under the Distorted Source Voltage and Frequency Condition (전원 전압 왜곡과 주파수 변동 시 단상 PWM 컨버터의 전류 제어)

  • Ahn, Chang-Heon;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.4
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    • pp.356-362
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    • 2015
  • This paper presents a current control strategy in the synchronous reference frame for a single-phase PWM converter, which ensures sinusoidal input current control under the distorted source voltage and frequency condition. Given that the distorted source voltage distorts the phase angle for PWM converter control, the input current contains the same harmonics as the source voltage. Aside from the distorted voltage, the variation in source frequency reduces the performance of input current control. To achieve sinusoidal input current control under the distorted source voltage and frequency condition, this paper proposes a compensation strategy of current reference with the distortion component extracted from the phase angle and a detection strategy of frequency variation from the output of a synchronous reference frame phase-lock loop. The experimental results confirm the validity of the proposed method under the distorted source voltage and frequency condition.

Sinusoidal Current Control of Single-Phase PWM Converters under Voltage Source Distortion Using Composite Observer (왜곡된 전원 전압하에서 Composite 관측기를 이용한단상 PWM 컨버터의 정현파 전류 제어)

  • Nguyen, Thanh Hai;Lee, Dong-Choon;Lee, Suk-Gyu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.5
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    • pp.466-476
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    • 2011
  • In this paper, a high-performance current control for the single-phase PWM converter under distorted source voltages is proposed using a composite observer. By applying the composite observer, the fundamental and high-order harmonic components of the source voltage and current are extracted without a delay. The extracted fundamental component is used for a phase-lock loop (PLL) system to detect the phase angle of the source voltage. A multi-PR (proportional-resonant) controller is employed to regulate the single-phase line current. The high-order harmonic components of the line current are easily eliminated, resulting in the sinusoidal line current. The simulation and experimental results have verified the validity of the proposed method.