• Title/Summary/Keyword: pulse delay time

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Time-Domain Numerical Investigation of Ring Resonator Optical Delay Devices

  • Chung, Youngchul
    • Journal of the Optical Society of Korea
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    • v.17 no.5
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    • pp.441-446
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    • 2013
  • A split-step time-domain model for the analysis of pulse delay characteristics through ring resonator all-pass filters (APF's) is developed and its accuracy is checked. The dependence of the delay time and pulse distortion on the coupling ratios is investigated using the model. It is observed that the bandwidth of the APF's needs to be wide enough to minimize the pulse distortion.

Mean time delay variation performane of DTTL bit synchronizer (DTTL 비트동기장치의 평균시간지연 편차 성능에 관한 연구)

  • 김관옥
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.11
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    • pp.2401-2408
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    • 1997
  • The measured pulse shapes provided in the given data package demonstrated pulse distortions due to laser speckle. the distorted pulse shapes were carefully analyzed, modeled, and then applied to the DTTL(Digital-data Transition Tracking Loop)[1] bit synchronizer simulator to measure the mean time delay and its delay variation performance. The result showed that the maximum mean time delay variation with the modeled data was 12.5% when window size equals 1. All the data given were located within this modeled boundary and the maximum eman time delay variation was 7% in this case. The mean time delay variation was known to be smaller by reducing the window size [2][5][6]. The mitigated delay variation was 2.5% in the modeled case and 1.4% in the data set given when the windown size equals 0.1. With the digital DTTL insteal of analog DTTL, similar results was obtained.

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Study on Timing Characteristics of High-Voltage Pulse Generation with Different Charging Voltages

  • Lee, Ki Wook;Kim, Jung Ho;Oh, Sungsup;Lee, Wangyong;Kim, Woo-Joong;Yoon, Young Joong
    • Journal of electromagnetic engineering and science
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    • v.18 no.1
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    • pp.20-28
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    • 2018
  • The time synchronization of each sub-unit of a pulsed generator is important to generate an output high-power radio frequency (RF) signal. To obtain the time synchronization between an input RF signal fed by an external source and an electron beam produced by an electric pulse generator, the influence of different charging voltages on a delay and a rise time of the output pulse waveform in the electric pulse generator should be carefully considered. This paper aims to study the timing characteristics of the delay and the rise time as a function of different charging voltages with a peak value of less than -35 kV in the high-voltage pulse generator, including a trigger generator (TG) and a pulse-forming line (PFL). The simulation has been carried out to estimate characteristics in the time domain, in addition to their output high-voltage amplitude. Experimental results compared with those obtained by simulation indicate that the delay of the output pulses of the TG and PFL, which are made by controlling the external triggering signal with respect to different charging voltages, is getting longer as the charging voltage is increasing, and their rise times are inversely proportional to the amplitude of the charging voltage.

Characteristics of DC Plasma Display Panel with Double Pulse Memory (Double Pulse Memory 방식을 이용한 DC Plasma Display Panel의 특성 연구)

  • 최경철;신범재;왕기웅
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.29B no.1
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    • pp.67-75
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    • 1992
  • A new method of driving the PDP(Plasma Display Panel) was proposed and its characteristics were investigated. Applying high frequency non-discharge pulses to an auxiliary anode resulted an increased region of stable operation, decreased delay time and increased light intensity. It is suggested that PDP with DPM (Double Pulse Memory) drive technique improves the delay time, luminance, region of stable operation and luminous efficacy compared to PDP with PPM(Planar Pulse Memory) drive technique developed by NHK Lab. in Japan.

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Field-Programmable Gate Array-based Time-to-Digital Converter using Pulse-train Input Method for Large Dynamic Range (시간 측정범위 향상을 위한 펄스 트레인 입력 방식의 field-programmable gate array 기반 시간-디지털 변환기)

  • Kim, Do-hyung;Lim, Han-sang
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.6
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    • pp.137-143
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    • 2015
  • A delay-line type time-to-digital converter (TDC) implemented in a field-programmable gate array (FPGA) is most widely owing due to its simple structure and high conversion rate. However, the delay-line type TDC suffers from nonlinearity error caused by the long delay-line because its time interval measurement range is determined by the length of the used delay line. In this study, a new TDC structure with a shorter delay line by taking a pulse train as an input is proposed for improved time accuracy and efficient use of resources. The proposed TDC utilizes a pulse-train with four transitions and a transition state detector that identifies the used transition among four transitions and prevents the meta-stable state without a synchronizer. With 72 delay cells, the measured resolution and maximum non-linearity were 20.53 ps, and 1.46 LSB, respectively, and the time interval measurement range was 5070 ps which was enhanced by approximately 343 % compared to the conventional delay-line type TDC.

A study on the pulse forming of pulsed $CO_2$ laser using active multi-pulse superposition (능동적 다중 펄스 중첩법(AMPS)을 적용한 펄스형 $CO_2$ 레이저의 펄스 성형에 대한 연구)

  • Chung, Hyun-Ju;Park, Sung-Joon;Jung, Yong-Ho;Song, Gun-Ju;Kim, Hee-Je;Kim, Whi-Young
    • Proceedings of the KIEE Conference
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    • 2001.07c
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    • pp.1631-1633
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    • 2001
  • In manufacturing processes, various and suitable pulse shapes are required for the purpose of material processing and the pulseshape is regarded as a dominant factor due to the specific property of processing materials. Therefore, in this study, a variable pulse width, high duty cycle Pulse Forming Network(PFN) is constructed by time sequently. The power supply for this experiment consists of three switching circuits. The PFN elements operate at low voltage and drive the primary of HV leakage transformer. The secondary of the transformer has a full-wave rectifier, which passes the pulse energy to the load in a continuous sequence of properly phased and nested increments. We investigated laser pulse width as various delay time among three switching circuit. As a result, we tan obtain various laser pulse width from about 4ms to 10ms. The maximum laser pulse width obtained at this experiment was about 10ms at delay time of 4ms among each switching circuit.

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Robustness Analysis of Pulse Response based Identification Methods for First-Order Plus Time-Delay Model (1차 지연시간 모델의 펄스응답기반 식별방식에 대한 강인성 해석)

  • Jin, LiHua;Ryu, Ho-Sun;Kim, Young-Chol
    • Proceedings of the KIEE Conference
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    • 2007.04a
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    • pp.83-85
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    • 2007
  • A new approach on identifying a first-order plus time-delay (FOPTD) model using finite--duration pulse inputs has been presented recently [1]. The identification methods are very simple because it is enough to observe only two extremes and the time when they occur in the transient response to pulse input. However, when there is mismatch between actual system and FOPTD model. how sensitive the methods are has not been studied. In this paper, we investigate robustness issue of those identification algorithms in the presence of the model structure mismatch and uncertainties. Through an example we will demonstrate it.

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Development of Real Time Autocorrelator and the Measurement of Pulse Width of CW Mode-Locked Nd:YLF Laser (실시간 자기상관계의 제작과 CW mode-locked Nd:YLF 레이저의 펄스폭 측정)

  • 안승준;전영민;공홍진
    • Korean Journal of Optics and Photonics
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    • v.2 no.4
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    • pp.197-202
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    • 1991
  • The real time autocorrelator has been developed in order to measure the pulse widths of ultrashort laser pulses using the SHG method. The scanning range of the autocorrelator is 142 ps, and inserting a delay block in one arm of the autocorrelator, the scanning range can be extended to 250 ps. The shortest pulse width was measured to be 20 ps, when the cavity length was well matched to the RF frequency of the mode-locker, and broadened to be 39 ps and 47 ps as the cavity length was detuned.

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Optical Transient Characteristics of Au-Compensated Silicon p-i-n Diode Switches (금이 보상된 실리콘 p-i-n 다이오드 스위치의 광 과도 특성)

  • Min, Nam-Ki;Henderson, H.T.
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1205-1208
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    • 1995
  • The optically-gated p-i-n diode switches have been fabricated with gold-compensated silicon. The turn-on and turn-off delay times and the rise and fall times were measured as a function of optical power level, bias, and pulse width. The turn-on characteristics shows a strong dependence an optical pulse power and a delay time(${\delta}{\iota}$) between two pulses, but a weak dependence on the width of optical pulse. Actually there is no turn-off delay in gold-doped p-i-n switches and the fall time is negligible.

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A DELAYED SIR EPIDEMIC MODEL WITH NONLINEAR INCIDENCE RATE AND PULSE VACCINATION

  • Du, Yanke;Xu, Rui
    • Journal of applied mathematics & informatics
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    • v.28 no.5_6
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    • pp.1089-1099
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    • 2010
  • An SIR epidemic model with pulse vaccination and time delay describing infection period is investigated. The global attractiveness of the infection-free periodic solution is discussed, and sufficient condition is obtained for the permanence of the system. Our results indicate that a large vaccination rate or a short period of pulsing leads to the eradication of the disease.