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Shuichi Nitta - One of the best experts on this subject based on the ideXlab platform.

  • A common Mode Noise filter for high speed and wide band differential Mode signal transmission
    10th International Symposium on Electromagnetic Compatibility, 2011
    Co-Authors: Koichiro Misu, Satoshi Yoneda, Seiichi Saito, Shuichi Nitta
    Abstract:

    This study shows the Noise reduction characteristics of a Noise filter composed of a common Mode choke and a differential Mode choke. A common Mode choke is usually used for the common Mode Noise reduction on a differential Mode signal transmission line. The common Mode choke attenuates the common Mode Noise and passes the differential Mode signal on the signal transmission line. The common Mode choke works as a high impedance element for the common Mode Noise and as a low impedance element for the differential Mode signal. However, it is difficult to realize a large reduction effect of Noise in wide frequency range by using only a common Mode choke. A special feature of the common Mode Noise filter proposed in this paper is to have a differential Mode choke added to a common Mode choke. The differential Mode choke works as a low impedance element for common Mode Noise and as a high impedance element for differential Mode signal. The Noise filter studied in this paper reduces common Mode Noise 20dB or more and demonstrates the good transmission characteristics of a differential Mode signal in the wide frequency range from 1MHz to 1GHz. In addition, this filter generates very small differential Mode component converted from a common Mode Noise.

  • Differential Mode Noise on the PCB's signal traces converted from external common Mode Noise
    2009 IEEE International Symposium on Electromagnetic Compatibility, 2009
    Co-Authors: Takefumi Kumamoto, Koichiro Misu, Shuichi Nitta
    Abstract:

    This study experimentally clarifies the relationship between the common Mode Noise induced on the cable connected to the signal trace of PCB and the differential Mode Noise on signal trace, converted from the common Mode Noise, due to the unbalance of differential signal trace by applying the measurement method that Test baluns are used as a load of the cable and a signal source. In this study, S13 (Differential Mode Noise) and S23 (Common Mode Noise) are measured by the network analyzer for evaluation. Finally, the effectiveness of the common Mode choke on signal trace and the shielding for the cable for both common Mode and differential Mode Noise reduction are evaluated.

  • Conductive common-Mode Noise reduction by system balance improvement on three phase inverter
    2008 Asia-Pacific Symposium on Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, 2008
    Co-Authors: Nimit Boonpirom, Kaison Aunchaleevarapan, Yothin Prempraneerach, Shuichi Nitta
    Abstract:

    This paper aims for the conductive common-Mode Noise reduction by system balance improvement on three phase inverter. The main objective is to improve the system balance on three phase inverter based on passive balance and active balance for common-Mode Noise reduction. As a result, the common-Mode current which is generated by PWM switching voltage will be cancelled in frame ground. The concept of system balance and equivalent circuit on double-switch converter for three phase inverter is proposed. Furthermore, the experimental results of three phase induction motor drive by three phase inverter, that is both of time domain measuring and spectrum of common-Mode Noise measuring are employed respectively.

  • A Study on the System Imbalance of the Single-Switch Converter for the Conductive Common Mode Noise Reduction
    IEICE Transactions on Communications, 2007
    Co-Authors: Nimit Boonpirom, Kaison Aunchaleevarapan, Yothin Prempraneerach, Kitti Paithoonwatanakij, Shuichi Nitta
    Abstract:

    This paper reduces system imbalance by replacing the single-switch converter with a synchronized double-switch converter based on two active switches technique and hybrid balance technique, including active balance and passive balance for common Mode Noise reduction. The system balance is experimentally evaluated by the common Mode rejection ratio (CMRR). Finally, examples show that the CMRR of the single-switch converter is improved from 1.67 dB to 32.04 dB when the double-converter with two active switches technique is applied and to 41.5dB when the double-switch converter with hybrid balance technique is applied.

  • A Study on Common-Mode Noise Generation in Switching Circuit due to Unbalanced Characteristic
    2007 Power Conversion Conference - Nagoya, 2007
    Co-Authors: T. Intachot, W. Klungwijit, Yothin Prempraneerach, Shuichi Nitta
    Abstract:

    General switching converter such as the simple high-side switching circuit inherently has unbalanced characteristics of impedance of transmission path, voltage at dc source and load terminals with respect to the frame ground. These unbalanced characteristic effects are the cause of unbalanced voltages at both dc source and load terminals. These unbalanced voltages will produce common-Mode Noise flowing through frame ground to the LISN during the active switch turn-off and on. This paper presents the analytical and experimental consideration of common-Mode Noise generation due to the unbalanced effect. The mechanism of common-Mode Noise generation due to unbalanced effect can be explained by equivalent circuit in both turn-off and turn-on time of the active switch. For common-Mode Noise reduction, the method for balancing the switching converter is also presented. Common-Mode Noise generated due to the effect of circuit imbalance is clarified by the experimental results. The balanced switching converter can greatly reduce the common-Mode Noise is also confirmed by the experimental results.

Guang-hwa Shiue - One of the best experts on this subject based on the ideXlab platform.

  • Common-Mode Noise effect for differential traces adjacent ground lines connection a ground plane
    2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2015
    Co-Authors: Hao-che Hung, Syue-liang Hong, Shu-an Chou, Zheng-xiang Chen, Li Chieh Chen, Guang-hwa Shiue
    Abstract:

    This study investigates how common-Mode Noise (CMN) is generated and reduced for the differential traces with adjacent ground lines were connected to a ground plane. Based on the resonant effects of ground line and parallel ground planes, the CMN generation mechanism is studied. Based on the analysis of the generation mechanism, a simple design guideline for CMN reduction is proposed for the differential traces with adjacent ground lines were connected to a ground plane.

  • Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines
    IEEE Transactions on Components Packaging and Manufacturing Technology, 2013
    Co-Authors: Guang-hwa Shiue, Yi-chin Tsai, Dries Vande Ginste
    Abstract:

    This paper proposes design schemes to reduce the common Mode Noise from weakly coupled differential serpentine delay microstrip lines (DSDMLs). The proposed approach is twofold: we leverage strongly coupled vertical-turn-coupled traces (VTCTs) instead of weakly coupled VTCTs (conventional pattern) and add guard traces. Time-and frequency-domain analyses of the proposed schemes for reducing the common-Mode Noise are performed by studying the transmission waveform and the differential-to-common Mode conversion using the circuit solver HSPICE and the 3-D full-wave simulator HFSS, respectively. Compared to the conventional design of the weakly coupled DSDMLs, the proposed solutions yield a reduction of about 54% of the peak-to-peak amplitude of the common-Mode Noise, while the differential impedance remains matched along the complete length of the DSDML. Moreover, the range of frequencies, over which the magnitude of the differential-to-common Mode conversion is now significantly reduced, is very wide, i.e., about 0.3-10 GHz. Furthermore, the differential insertion and reflection loss introduced by the newly proposed designs are almost the same as the ones achieved by using the conventional design. Finally, a favorable comparison between simulated and measured results confirms the excellent common-Mode Noise reduction performance of the proposed schemes.

  • Analysis of Common-Mode Noise for Weakly Coupled Differential Serpentine Delay Microstrip Line in High-Speed Digital Circuits
    IEEE Transactions on Electromagnetic Compatibility, 2012
    Co-Authors: Guang-hwa Shiue, Jia-hung Shiu, Yi-chin Tsai
    Abstract:

    This study investigates the mechanisms of generation of the transient transmission common-Mode Noise in a differential serpentine delay line under weak coupling condition. The generation mechanism and the frequency of common-Mode Noise are investigated with reference to the time-domain transmission waveform and the differential-to-common Mode conversion mixed-Mode S-parameters using the circuit solver HSPICE and 3-D full-wave simulator HFSS, respectively. The generation mechanisms of common-Mode Noise include length mismatch between vertical-turn-coupled traces, the length effect of parallel-coupled traces, and the crosstalk Noise effect. Moreover, a graphical method based on wave tracing is presented to illustrate the cancellation mechanism of near-end common-Mode Noise for the symmetrical differential serpentine delay line. Some practical, commonly used layout routings of the differential serpentine delay line are investigated. Some important design guidelines are provided to help design differential serpentine delay line with low common-Mode Noise. A comparison between simulated and measured results validates the equivalent circuit Model and analytical approach.

  • Common-Mode Noise reduction schemes for differential serpentine delay microstrip line in high-speed digital circuits
    2011 IEEE 20th Conference on Electrical Performance of Electronic Packaging and Systems, 2011
    Co-Authors: Guang-hwa Shiue, Yi-chin Tsai, Jia-hung Shiu
    Abstract:

    This work proposes two Noise reduction schemes that use strongly coupled vertical-turn traces as substitute for weakly coupled vertical-turn traces and added guard traces to reduce the common-Mode Noise in a weakly differential serpentine delay microstrip line. The peak-to-peak amplitude of common-Mode Noise in the time-domain is reduced by bout 65% using the two methods, according to simulation results. The simulation results demonstrate that the frequency range over which the magnitude of differential-to-common Mode conversion is reduced for a differential serpentine delay line with is wide band in the range 0.1~2.7 GHz and 3.2~10 GHz. Furthermore, the differential reflection loss for additional guard traces is only slightly reduced at the frequency of interest, but when strongly coupled vertical- turn traces are used. However, the differential insertion loss achieved using the two improved schemes is almost the same as that of the traditional pattern.

  • New wideband common-Mode Noise filter using quarter-wavelength resonator for high-speed differential signals
    19th Topical Meeting on Electrical Performance of Electronic Packaging and Systems, 2010
    Co-Authors: Guang-hwa Shiue, Po-wei Chiu, Sheng-shiun Tsai
    Abstract:

    This work presents a novel, inexpensive and wideband common-Mode Noise suppression filter by using quarter-wavelength resonator. The quarter-wavelength resonator can provide a shorting path for common-Mode return current of differential interconnects around the resonance frequency of the open stub. The feasibility of cascading several open stubs is proposed to achieve the wideband bandwidth over a broad GHz range. Numerical results indicate the rejection band of the proposed filter ranges from around 4.27GHz to 8.2GHz by over 20dB for cascading three different lengths of open stubs. The location of open stub underneath and parallel to the differential traces greatly facilitates implementation of common-Mode Noise filter in multilayer structures and multiple differential signaling pairs for high-speed digital systems, e.g. USB3.0 and HDMI. Importantly, in term of eye diagrams, signal integrity of the differential signals is not degraded within the wide bandwidth of the proposed common-Mode Noise filter.

Chun-long Wang - One of the best experts on this subject based on the ideXlab platform.

  • Common-Mode Noise reduction of right-angled coupled stripline using timing-offset differential signal
    2016 IEEE 20th Workshop on Signal and Power Integrity (SPI), 2016
    Co-Authors: Chun-long Wang
    Abstract:

    In this paper, a right-angled coupled microstrip line using the timing-offset differential signal is proposed. The right-angled coupled microstrip line using the timing-offset differential signal can greatly reduce the TDT common-Mode Noise from 68 mV to 26 mV as compared with the right-angled coupled microstrip line using zero timing-offset differential signal. In order to further reduce the TDT common-Mode Noise, a right-angled coupled stripline using the timing-offset differential signal is proposed. As compared with the right-angled coupled microstrip line using the timing-offset differential signal, the TDT common-Mode Noise is further reduced from 26 mV to 13 mV. In order to verify the simulation results, measurement is conducted in the time domain where the measurement results are in good agreement with the simulation results.

  • Differential-Mode Noise suppression using L-shaped pad
    2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2015
    Co-Authors: Bao-ren Huang, Chun-long Wang
    Abstract:

    In this paper, a bended differential transmission line using the L-shaped pad is proposed to suppress the differential-Mode Noise. The bended differential transmission line using the L-shaped pad can reduce the differential-to-common Mode conversion from -6.58 dB to -10.10 dB and the TDR differential-Mode Noise from 0.087 V to 0.023 V as compared with the bended differential transmission line using the parallel-plate capacitor. In order to verify the simulation results, measurement is done in the frequency and time domains where the measurement results are in good agreement with the simulation results.

  • Common-Mode Noise Suppression of Differential Serpentine Delay Line Using Timing-Offset Differential Signal
    IEEE Transactions on Electromagnetic Compatibility, 2015
    Co-Authors: Kuan-chung Chen, Chun-long Wang
    Abstract:

    In this paper, in order to reduce the common-Mode Noise, a differential serpentine delay line using the timing-offset differential signal is proposed. The time-domain transmission common-Mode Noise is greatly reduced from 0.0266 to 0.0126 V, and the time-domain reflection differential-Mode Noise is maintained the same as compared with the differential serpentine delay line using the zero timing-offset differential signal. Besides, the differential-to-common Mode conversion is reduced; the differential-to-differential and differential-to-common Mode reflections are kept small. Furthermore, the differential-to-differential Mode transmission is maintained the same and the eye diagram is improved. In order to verify the simulation results, scaled up circuits are fabricated and measured where the measurement results are in good agreement with the simulation results.

  • Common-Mode Noise Reduction Using Asymmetric Coupled Line With SMD Capacitor
    IEEE Transactions on Components Packaging and Manufacturing Technology, 2014
    Co-Authors: Bao-ren Huang, Chia-han Chang, Ruei-ying Fang, Chun-long Wang
    Abstract:

    In this paper, a bended differential transmission line using the asymmetric coupled line (ACL) with surface mount device (SMD) capacitor is proposed to suppress the common-Mode Noise. The bended differential transmission line using the ACL with SMD capacitor can greatly reduce the Mode conversion from -6.91 to -13.29 dB and the Time-Domain-Through common-Mode Noise from 0.063 to 0.023 V as compared with the bended differential transmission line using the right-angle bend. Also, the differential-Mode transmission is increased and the small differential-Mode reflection is maintained. To verify the simulation results, measurement is done in the frequency and time domains where the measurement results are in good agreement with the simulation results.

  • Bended Differential Transmission Line Using Compensation Inductance for Common-Mode Noise Suppression
    IEEE Transactions on Components Packaging and Manufacturing Technology, 2012
    Co-Authors: Chia-han Chang, Ruei-ying Fang, Chun-long Wang
    Abstract:

    In this paper, a bended differential transmission line using a compensation inductance is proposed to efficiently suppress the common-Mode Noise. The bended differential transmission line using the compensation inductance can then be implemented by the bended differential transmission line using the short-circuited coupled line. It has been shown that the bended differential transmission line using the short-circuited coupled line can greatly reduce the Mode conversion from -5.47 to -14.75 dB, and the time-domain-through common-Mode Noise from 0.068 to 0.02 V as compared with the bended differential transmission line using the right-angle bend. In order to verify the simulation results, measurement is done in the frequency and time domains where the measurement results are in good agreement with the simulation results.

Hsin-nan Ke - One of the best experts on this subject based on the ideXlab platform.

  • Common-Mode Noise reduction of bended coupled lines by using time compensation technology
    2016 IEEE International Symposium on Electromagnetic Compatibility (EMC), 2016
    Co-Authors: Chung-pin Huang, Hsin-nan Ke
    Abstract:

    New schemes of right-angle bended coupled lines with axis-aligned periodic stepped-impedance lines (SILs) and non-axis-aligned periodic SILs are proposed to suppress common-Mode Noise and differential-to-common Mode conversion in this paper. The advantages of the periodic SILs structures employed in coupled lines have lower manufacture cost and easier implemented in two-layer PCB, preserving acceptable transmission level and low reflection to maintain signal integrity (SI). The function of SILs structures is used to increase the electrical length of the shorter one, i.e., to increase its respective propagation time, thereby improves the SI when differential signals pass through the asymmetric bended coupled lines.

  • Using Stepped-Impedance Lines for Common-Mode Noise Reduction on Bended Coupled Transmission Lines
    IEEE Transactions on Components Packaging and Manufacturing Technology, 2016
    Co-Authors: Chung-pin Huang, Hsin-nan Ke
    Abstract:

    Right-angle bended coupled lines with a periodic stepped-impedance line (SIL) structure are proposed to suppress both common-Mode Noise and differential-to-common Mode conversion in this paper. The advantage of the periodic SIL structure shows that it is not only with lower manufacture cost and easier implemented in two-layer Printed Circuit Board (PCB) but also maintains acceptable transmission level and low reflection. The function of the SIL structure is to increase the length of the shorter one of the bended line, i.e., to increase its respective propagation time, thereby improving the signal integrity without largely increasing the circuit size of PCB. Measured result of common-Mode Noise introduced by right-angle bended coupled lines with SILs structure can be reduced by 83 mV, time skew can be reduced by 31.53 ps, Mode conversion can be suppressed from dc to 10 GHz for getting wideband suppression based on -25 dB definition, and measured result of eye-diagram, the eye-opening is improved by 9.97%, all measured results are compared with conventional right-angle bended coupled lines.

  • Common-Mode Noise reduction on broadside-coupled delay line
    2015 IEEE Symposium on Electromagnetic Compatibility and Signal Integrity, 2015
    Co-Authors: Chung-pin Huang, Hsin-nan Ke
    Abstract:

    Conventional edge-coupled differential delay lines are becoming popular choice on high-speed connection, which depend on their balanced property and superior immunity to Noise interference. Although edge-coupled differential delay lines with differential signaling have many advantages, such as high Noise immunity and low Noise radiation, yet common-Mode Noise are becoming higher and higher resulting data rate approaches GHz level. Hence, broadside-coupled differential delay lines are proposed for common-Mode Noise reduction in this research. Simulation results show that time-domain common-Mode Noise on broadside-coupled serpentine and spiral delay lines can reduce 79 % and 84.57 % compared with edge-coupled serpentine and spiral delay lines. Similarly, frequency-domain differential to common-Mode conversions have significant reduction at the frequency band of interest.

Yi-chin Tsai - One of the best experts on this subject based on the ideXlab platform.

  • Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines
    IEEE Transactions on Components Packaging and Manufacturing Technology, 2013
    Co-Authors: Guang-hwa Shiue, Yi-chin Tsai, Dries Vande Ginste
    Abstract:

    This paper proposes design schemes to reduce the common Mode Noise from weakly coupled differential serpentine delay microstrip lines (DSDMLs). The proposed approach is twofold: we leverage strongly coupled vertical-turn-coupled traces (VTCTs) instead of weakly coupled VTCTs (conventional pattern) and add guard traces. Time-and frequency-domain analyses of the proposed schemes for reducing the common-Mode Noise are performed by studying the transmission waveform and the differential-to-common Mode conversion using the circuit solver HSPICE and the 3-D full-wave simulator HFSS, respectively. Compared to the conventional design of the weakly coupled DSDMLs, the proposed solutions yield a reduction of about 54% of the peak-to-peak amplitude of the common-Mode Noise, while the differential impedance remains matched along the complete length of the DSDML. Moreover, the range of frequencies, over which the magnitude of the differential-to-common Mode conversion is now significantly reduced, is very wide, i.e., about 0.3-10 GHz. Furthermore, the differential insertion and reflection loss introduced by the newly proposed designs are almost the same as the ones achieved by using the conventional design. Finally, a favorable comparison between simulated and measured results confirms the excellent common-Mode Noise reduction performance of the proposed schemes.

  • Analysis of Common-Mode Noise for Weakly Coupled Differential Serpentine Delay Microstrip Line in High-Speed Digital Circuits
    IEEE Transactions on Electromagnetic Compatibility, 2012
    Co-Authors: Guang-hwa Shiue, Jia-hung Shiu, Yi-chin Tsai
    Abstract:

    This study investigates the mechanisms of generation of the transient transmission common-Mode Noise in a differential serpentine delay line under weak coupling condition. The generation mechanism and the frequency of common-Mode Noise are investigated with reference to the time-domain transmission waveform and the differential-to-common Mode conversion mixed-Mode S-parameters using the circuit solver HSPICE and 3-D full-wave simulator HFSS, respectively. The generation mechanisms of common-Mode Noise include length mismatch between vertical-turn-coupled traces, the length effect of parallel-coupled traces, and the crosstalk Noise effect. Moreover, a graphical method based on wave tracing is presented to illustrate the cancellation mechanism of near-end common-Mode Noise for the symmetrical differential serpentine delay line. Some practical, commonly used layout routings of the differential serpentine delay line are investigated. Some important design guidelines are provided to help design differential serpentine delay line with low common-Mode Noise. A comparison between simulated and measured results validates the equivalent circuit Model and analytical approach.

  • Common-Mode Noise reduction schemes for differential serpentine delay microstrip line in high-speed digital circuits
    2011 IEEE 20th Conference on Electrical Performance of Electronic Packaging and Systems, 2011
    Co-Authors: Guang-hwa Shiue, Yi-chin Tsai, Jia-hung Shiu
    Abstract:

    This work proposes two Noise reduction schemes that use strongly coupled vertical-turn traces as substitute for weakly coupled vertical-turn traces and added guard traces to reduce the common-Mode Noise in a weakly differential serpentine delay microstrip line. The peak-to-peak amplitude of common-Mode Noise in the time-domain is reduced by bout 65% using the two methods, according to simulation results. The simulation results demonstrate that the frequency range over which the magnitude of differential-to-common Mode conversion is reduced for a differential serpentine delay line with is wide band in the range 0.1~2.7 GHz and 3.2~10 GHz. Furthermore, the differential reflection loss for additional guard traces is only slightly reduced at the frequency of interest, but when strongly coupled vertical- turn traces are used. However, the differential insertion loss achieved using the two improved schemes is almost the same as that of the traditional pattern.