• Title, Summary, Keyword: crosstalk

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Twisted Differential Line Structure on High-Speed Printed Circuit Boards to Enhance Immunity to Crosstalk and External Noise

  • Kam, Dong-Gun;Kim, Joung-Ho
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.1
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    • pp.35-42
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    • 2003
  • Differential signaling has become a popular choice for high-speed interconnection schemes on Printed Circuit Boards (PCBs), offering superior immunity to external noise. However, conventional differential transmission lines on PCBs have problems, such as crosstalk and radiated emission. To overcome these, we propose a Twisted Differential Line (TDL) structure on a multi-layer PCB. Its improved immunity to crosstalk noise and the reduced radiated emission has been successfully demonstrated by measurement. The proposed structure is proven to transmit 3 Gbps digital signals with a clear eye-pattern. Furthermore, it is subject to much less crosstalk noise and achieves a 13 dB suppression of radiated emission. Index Terms - Twisted Differential Line, Differential Signaling, Crosstalk, Radiated Emission, Transmission Line, Twisted Pair

Crosstalk Analysis of the Spiral Inductor in LTCC (다층 구조를 갖는 LTCC기술에서 나선형 인덕터로 인한 혼신 해석)

  • Kim, Seong-Nam;Kim, Gyung-Chul;Cho, Hyun-Min;Hwang, Chi-Jeon;Yang, Hyung-Kook;Lee, Hai-Young
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.260-264
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    • 2003
  • It is possible to design the high performance, integration and low cost radio frequency components by using LTCC(Low Temperature Cofired Ceramic) technology. But there is a critical point to design the spiral inductor because of crosstalk effects. of the crosstalk effect of the spiral inductor are investigated using full-wave analysis of the FEM(Finite Element Method) in this paper. The results show that input power of the spiral inductor are coupled from 0.1% to 10% above 3GHz. Therefore, we should consider the crosstalk effects when we design the LTCC.

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Simulations on Crosstalk of Pixel Voltage Compensation Methods (화소 전압 보상 방법에 대한 Crosstalk 특성 시뮬레이션)

  • Kim, Tae-Hyung;Park, Jae-Woo;Kim, Jin-Hong;Choi, Jong-Sun
    • Proceedings of the KIEE Conference
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    • pp.449-451
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    • 2000
  • Crosstalk is the primary cause of image distortion in active matrix liquid crystal displays (AMLCD). Crosstalk produces voltage errors that limit gray scale fidelity and consequently, degrades display resolution, contrast ratio, color fidelity, and image quality. In this study, crosstalk phenomena of some methods to compensate level shift voltages has been simulated. This will be contributed to find the way to design the excellent image quality of the TFT-LCDs.

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Crosstalks of Two-Waveguide and Three-Waveguide Directional Couplers (두도파로 및 세도파로 방향성 결합기의 Crosstalk)

  • 김영문;김창민
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.6
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    • pp.54-62
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    • 1998
  • The crosstalks of two-waveguide & three-waveguide directional couplers are analyzed. Advantages and disadvantages for each coupler are compared and discussed. Based on the relationship between the coupled mode and the normal mode, the mathematical expressions are derived in terms of the crosstalks for each directional coupler. Numerical techniques such as the finite-difference method and the beam propagation method are employed to testify the validity of the derived equations. The calculation results show that two-waveguide directional coupler is superior to any types of three-waveguide couplers from the practical viewpoint of the crosstalk and the coupling length.

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A Studying on the Crosstalk Characteristic of mm-wave Coplanar-waveguide (극초고주파용 CPW의 결합노이즈특성에 관한 연구)

  • Jang In-Bum;Park Jae-Jun;Lee Joon-ung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.2
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    • pp.158-161
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    • 2006
  • The purpose of this research is to establish the crosstalk characteristic of mm-wave Coplanar structure. The components in mm-wave CPW are classified to transmission devices, EM devices, and quasi - TEM devices. After design of these devices, we analyzed these CPW s electromagnetically using FDTD method, and suggested the corsstalk characteristic of mm-wave CPW. In oder to realize a CPW module up to 30 GHz-100 GHz band, we research on a technology of 3-dimensional mm-wave CPW, and GaAs substrate with ohmic lossy layer. As a result this research, we suggested the optimum crosstalk characteristic of mm-wave CPW, and improved the crosstalk quality of mm-wave CPW.

Crosstalk analysis of laser-diode array modules for wavelength division multiplexing (파장 분할 다중화 방식을 위한 고속 레이저 다이오드 배열 모듈의 혼신해석)

  • 김성일;이해영
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.34D no.7
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    • pp.71-78
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    • 1997
  • In this paper, we analyzed the crosstalk characteristics of LD array modules for WDM and improved the crosstalk levels using a screening line between access lines. From the calculation resutls, we have found that inductive crosstalk of access lines is dominant for the low impedance LD arrays with short bondwire interconnections. The proposed array interconnecton with the screening line and ouble bondwires, rduces the crosstalk level about 10dB compared to conventional interconnections using simple access lines and a single bondwire. This proposed structure also can be easily imlemented with transmission reliability.

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Signal Integrity Analysis of High Speed Interconnects In PCB Embedded with EBG Structures

  • Sindhadevi, M.;Kanagasabai, Malathi;Arun, Henridass;Shrivastav, A. K.
    • Journal of Electrical Engineering and Technology
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    • v.11 no.1
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    • pp.175-183
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    • 2016
  • This paper brings out a novel method for reducing Near end and Far end Crosstalk using Electromagnetic Band Gap structures (EBG) in High Speed RF transmission lines. This work becomes useful in high speed closely spaced Printed Circuit Board (PCB) traces connected to multi core processors. By using this method, reduction of −40dB in Near-End Crosstalk (NEXT) and −60 dB in Far End Crosstalk (FEXT) is achieved. The results are validated through experimental measurements. Time domain analysis is performed to validate the signal integrity property of coupled transmission lines.

Impact of Receiver on In-Band Crosstalk-Induced Penalties in Differentially Phase-Modulated Signals

  • Hu, Qikai;Kim, Hoon;Kim, Chul Han
    • Journal of the Optical Society of Korea
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    • v.20 no.2
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    • pp.223-227
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    • 2016
  • The impact of optical receiver configuration on in-band crosstalk-induced penalty has been investigated in both theoretical and experimental analyses, for differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) signals. Previously it has been shown that DPSK signals are ~6 dB more tolerant to in-band crosstalk than on-off keying (OOK) signals. However, we find that the tolerance difference between the two signals is reduced to ~3 dB when the decision threshold of the receiver is optimized to minimize the bit-error rate for each signal. Then we derive simple equations for the in-band crosstalk-induced penalty in DPSK and DQPSK signals with two different optical receiver configurations: balanced and single-ended direct-detection receivers. We confirm that the penalties obtained from our simple equations agree well with the measured results.

Adaptive Techniques for Joint Optimization of XTC and DFE Loop Gain in High-Speed I/O

  • Oh, Taehyoun;Harjani, Ramesh
    • ETRI Journal
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    • v.37 no.5
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    • pp.906-916
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    • 2015
  • High-speed I/O channels require adaptive techniques to optimize the settings for filter tap weights at decision feedback equalization (DFE) read channels to compensate for channel inter-symbol interference (ISI) and crosstalk from multiple adjacent channels. Both ISI and crosstalk tend to vary with channel length, process, and temperature variations. Individually optimizing parameters such as those just mentioned leads to suboptimal solutions. We propose a joint optimization technique for crosstalk cancellation (XTC) at DFE to compensate for both ISI and XTC in high-speed I/O channels. The technique is used to compensate for between 15.7 dB and 19.7 dB of channel loss combined with a variety of crosstalk strengths from $60mV_{p-p}$ to $180mV_{p-p}$ adaptively, where the transmit non-return-to-zero signal amplitude is a constant $500mV_{p-p}$.

Crosstalk optimization in high speed VLSI systems (고속 집적회로 시스템 설계에서 혼선잡음 최적화에 관한 연구)

  • 김기범;신현철
    • Journal of KIISE:Computer Systems and Theory
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    • v.30 no.5_6
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    • pp.265-272
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    • 2003
  • As VLSI systems become integrated at large-scale, logic fault or delay fault may result from crosstalk noise originated from cross coupling capacitance which exists between two adjacent wires. Because designers in industry do not have means to prevent crosstalk problems, they should check and adjust unsatisfactory designs after all designs are completed, if necessary. In this paper, we analyze how spacing, slew rate, line width, and line length influence the crosstalk, and suggest some solutions for the various factors that nay cause crosstalk problems. we also propose how to optimize the designs by using standardization of noise tables.