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Tzong-lin Wu - One of the best experts on this subject based on the ideXlab platform.

  • A Novel EBG Power Plane with Stopband Enhancement using Artificial Substrate
    2007 IEEE Electrical Performance of Electronic Packaging, 2007
    Co-Authors: Ting-kuang Wang, Tzong-lin Wu
    Abstract:

    Based on the conventional low-period coplanar EBG (LPC-EBG) structure, a novel Power Plane is proposed to extend the bandwidth of the stopband for ground bounce elimination using artificial substrate EBG (AS-EBG) structure. With properly embedded high-K rods and air rods in the substrate of the LPC-EBG Power Plane, the resonance frequencies can be shifted and thus result in the enhancement of the first stopband. Over 60% improvement of the stopband bandwidth can be achieved in this work. This improvement is also verified by the dispersion diagram calculated using the 2-D transmission-line model.

  • A novel Power Plane with super-wideband elimination of ground bounce noise on high speed circuits
    IEEE Microwave and Wireless Components Letters, 2005
    Co-Authors: Tzong-lin Wu, Ting-kuang Wang, Chien-chung Wang, G. Chang
    Abstract:

    A novel L-bridged electromagnetic bandgap (EBG) Power/ground Planes is proposed with super-wideband suppression of the ground bounce noise (GBN) from 600Mz to 4.6GHz. The L-shaped bridge design on the EBG Power Plane not only broadens the stopband bandwidth, but also can increase the mutual coupling between the adjacent EBG cells by significantly decreasing the gap between the cells. It is found the small gap design can prevent from the severe degradation of the signal quality for the high-speed signal referring to the perforated EBG Power Plane. The excellent GBN suppression performance with keeping reasonably good signal integrity for the proposed structure is validated both experimentally and numerically. Good agreement is seen.

  • A novel embedded Power Plane with 10Ghz stopband for simultaneous switching noise
    Proceedings Electronic Components and Technology 2005. ECTC '05., 2005
    Co-Authors: Chien-chung Wang, Ting-kuang Wang, Sung-mao Wu, Chia-hsing Chou, Chih-wei Tsai, Sin-ting Chen, Tzong-lin Wu
    Abstract:

    This paper proposes a novel embedded band selective (EBS) Power Plane with 10GHz stopband bandwidth. A four-layer laminate package with the dimension of 4cm square is used to implement the concept. Because the hybrid-cell periodic structure (HCPS) designed on the Power/ground Planes selects different rejection band, this novel embedded Power/ground Plane design behaves over 60dB SSN suppression from 1.5GHz up to 11.5GHz. This excellent behavior is validated both by simulation and measurement.

  • A new frequency selective surface Power Plane with broad band rejection for simultaneous switching noise on high-speed printed circuit boards
    2005 International Symposium on Electromagnetic Compatibility 2005. EMC 2005., 2005
    Co-Authors: Ting-kuang Wang, Chien-chung Wang, Sin-ting Chen, Tzong-lin Wu
    Abstract:

    A novel L-bridged frequency selective surface (FSS) Power/ground Planes is proposed with super-broadband rejection for simultaneous switch noise (SSN) from 600 Mz to 4.6 GHz. The L-shaped bridge design on the FSS Power Plane not only broadens the stop-band bandwidth, but also increases the mutual coupling between the adjacent FSS cells with allowing the significant decrease of the gap between the cells. It is found the small gap design can ease the degradation of the signal quality for the signal referring to the perforated FSS Power Plane. The excellent SSN suppression performance with keeping reasonably good signal integrity for the proposed structure is validated both experimentally and numerically. Good agreement is seen.

  • A novel Power Planes with low radiation and broadband suppression of ground bounce noise using photonic bandgap structures
    IEEE Microwave and Wireless Components Letters, 2004
    Co-Authors: Tzong-lin Wu, Sin-ting Chen
    Abstract:

    A novel Power/ground Planes design for eliminating the ground bounce noise (GBN) in high-speed digital circuits is proposed by using low-period photonic bandgap (PBG) structure. Keeping solid for the ground Plane and designing low-period PBG pattern on the Power Plane, the proposed structure omni-directionally behaves highly efficient suppression of GBN (over 50 dB) within broadband frequency range from 1 GHz to 4 GHz. Although the Power Plane has low-period perforation, the proposed structure still performs with relatively low radiation within the stopband compared with the solid Power/ground Planes. The low radiation and high suppression of the GBN for the proposed structure are checked both experimentally and numerically. Good consistency is seen.

Jong-gwan Yook - One of the best experts on this subject based on the ideXlab platform.

  • A Localized Enhanced Power Plane Topology for Wideband Suppression of Simultaneous Switching Noise
    IEEE Transactions on Electromagnetic Compatibility, 2010
    Co-Authors: Hee-do Kang, Jong-gwan Yook
    Abstract:

    Using a complementary spiral resonator mounted on the Power Plane, simultaneous switching noise and ground bouncing noise can be suppressed over a very wideband from 0.22 to 12.5 GHz under a noise suppression margin of -25 dB. Not only the suppression characteristic under 12.5 GHz is possible, but also over the higher frequency band, because the proposed structure operates like an RF choke. Therefore, the proposed structure can satisfy the 10% noise margin for the voltage swing ratio for both periodic and random clock signals. A size of 3.2 mm is necessary for the diameter of the resonator on the Power Plane, and is comparable to a clearance pad size with diameter of 3.0 mm in a ground Plane. Hence, the small size helps to reduce the discontinuity of the return current path; therefore, signal integrity problems and the degrees of freedom for Power Plane design of an electromagnetic bandgap structure are enhanced. Moreover, the effects of inductance and capacitance in the spiral resonator are analyzed for modeling. As a result, the suppression bandwidth and resonance frequency are controlled by the arm length and gap of spiral resonator. In addition, by applying two different sizes of resonators, it is shown that a multiresonance effect is also obtained.

  • An enhanced Power Plane topology using localized spiral resonator for wideband suppression of simultaneous switching noise
    2009 IEEE Antennas and Propagation Society International Symposium, 2009
    Co-Authors: Hee-do Kang, Jong-gwan Yook
    Abstract:

    Using Power Plane applied spiral resonators, GBN and SSN can be suppressed through very wideband from 0.22 GHz to 12.5 GHz under -25 dB. Also, the designed spiral resonator is just located on the intersection between Power Plane and Power via, and the diameter of resonator is 3 mm. Due to the localized small size of resonator, the degree of freedom for Power Plane design and signal integrity for guaranteed return current path are better than periodic EBG structure. Therefore, signal integrity and Power integrity can be guaranteed in a low noise condition by using spiral resonator mounted Power Plane.

  • A novel Power Plane topology for wideband suppression of simultaneous switching noise and fast computational method
    2009 IEEE Electrical Design of Advanced Packaging & Systems Symposium (EDAPS), 2009
    Co-Authors: Hee-do Kang, Jong-gwan Yook
    Abstract:

    Using spiral resonator mounted on a Power Plane, simultaneous switching noise and ground bouncing noise can be suppressed through very wideband from 0.22 GHz to 12.5 GHz under noise suppression margin of -25 dB. The area of diameter of 3.2 mm is necessary for the resonator, and is comparable to a clearance pad size, diameter of 3.0 mm, in a ground/Power Plane. Hence the small size makes discontinuity of return current path reduces, therefore the signal integrity problem of an electromagnetic bandgap structure can be improved. For the analysis of modeling, the effects of inductance and capacitance in the spiral resonator are analyzed. As a result, suppression bandwidth and resonance frequency can be easily controlled by arm length and gap of spiral. Moreover, by applying 2 different sizes of resonators on top and bottom of Power via, it is identified that multi-resonance effect is also obtained. Finally, it is shown that computational time can be dramatically decreased using both transmission line method and three-dimensional electromagnetic (3D EM) simulation instead of only 3D EM simulation for analysis.

  • design of Power Plane for suppressing spurious resonances in high speed pcbs
    Journal of electromagnetic engineering and science, 2006
    Co-Authors: Seung-seok Oh, Jong-gwan Yook
    Abstract:

    This paper presents a new Power Plane design method incorporating a single geometry derived from a unit cell of photonic bandgap(PBG) structure. This method yields constantly wide suppression of parallel plate resonances from 0.9 ㎓ to 4.2 ㎓ and is very efficient to eliminate PCB resonances in a specified frequency region to provide effective suppression of simultaneous switching noise(SSN). It is shown that with only two cells the propagation of unwanted high frequency signals is effectively suppressed, while it could provide continuous return signal path. The measured results agree very well with theoretically predicted ones, and confirm that proposed method is effective for reducing EMI, with measured near-field distribution. The proposed topology is suitable for design of high speed digital system.

  • A Novel Power Plane Topology for Suppressing Parallel-Plate-Resonance Modes in High Speed Printed Circuit Boards
    2006 European Microwave Integrated Circuits Conference, 2006
    Co-Authors: Seung-seok Oh, Jong-gwan Yook
    Abstract:

    This paper presents a new Power Plane design method incorporating a single geometry derived from a unit cell of photonic band gap (PBG) structure. This method yields constantly wide suppression of parallel plate resonances from 0.9 GHz to 4.2 GHz and is proved to be very efficient to eliminate PCB resonances in a specified frequency region to provide effective suppression of simultaneous switching noise (SSN). It is shown that with only two cells the propagation of unwanted high frequency noise is effectively suppressed, while it could provide continuous return signal path. The measured results agree very well with theoretically predicted ones, and confirm that the proposed method is effective to reduce EMI, as well as to ensure signal integrity (SI) issues. The proposed topology is suitable for design of high speed digital system

Madhavan Swaminathan - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Compact Electromagnetic Bandgap Structure in Power Plane for Wideband Noise Suppression and Low Radiation
    IEEE Transactions on Electromagnetic Compatibility, 2011
    Co-Authors: Madhavan Swaminathan
    Abstract:

    A compact reduced unit cell size electromagnetic bandgap (EBG) Power Plane, realized with a combination of alternating impedance EBG and multiple narrow slits, is presented. By concatenating 2 × 2 high-frequency unit cells, a virtual low-frequency EBG unit cell is synthesized without changing the overall dimensions. In this configuration, the basic slit in the high-frequency unit cell remained same, and an additional slit with longer dimensions is added in parallel to the basic slit by synthesizing a larger low-frequency unit cell. EBG is characterized for its dispersion diagram, noise suppression, signal integrity, and electromagnetic radiation. Fabricated EBG exhibits a bandgap from 0.9 to 3.5 GHz with isolation better than -40 dB over the band. Radiated emission of the new EBG is small with an average value of 35 dB·uV/m. Compact EBG also exhibits low impedance, which is less than 1 Ω over the stopband. Eye patterns are generated to analyze signal integrity issues when the data lines are referenced over the solid ground Plane and EBG Plane. The degradation of the maximum eye opening and the maximum eye width for the proposed EBG Power Plane at 2 Gb/s data rate is about 17.8% and 1%, respectively, with reference to the equivalent board with solid Power Plane.

  • Fast memory-efficient full-wave 3D simulation of Power Planes
    2009 IEEE International Symposium on Electromagnetic Compatibility, 2009
    Co-Authors: T.v. Narayanan, K. Srinivasan, Madhavan Swaminathan
    Abstract:

    A circuit-equivalent frequency-domain electromagnetic simulation for packaging structures is proposed. Simulations are carried out using an iterative memory-efficient approach — quasi-minimal residual method. The convergence of the solver is accelerated by the use of a suitable preconditioner. Results for a Power-Plane example, with and without aperture, are presented.

  • ATS - Load-Board/PCB Noise Suppression via Electromagnetic Band Gap Power Plane Patterning
    2008 17th Asian Test Symposium, 2008
    Co-Authors: Fidel Muradali, Madhavan Swaminathan
    Abstract:

    The work targets contemporary analog circuits/systems that trend toward high speed mixed analog/digital chips in the multi-GHz range and sub-systems containing both analog and high-speed digital die/chips. In these cases, Power integrity is important. For example, for GHz circuits, it can become necessary to block high frequency noise components from radiating or coupling to the analog Power Plane. Otherwise, operation of sensitive analog blocks or critical signals can be degraded.

  • Load-Board/PCB Noise Suppression via Electromagnetic Band Gap Power Plane Patterning
    2008 17th Asian Test Symposium, 2008
    Co-Authors: Fidel Muradali, Madhavan Swaminathan
    Abstract:

    The work targets contemporary analog circuits/systems that trend toward high speed mixed analog/digital chips in the multi-GHz range and sub-systems containing both analog and high-speed digital die/chips. In these cases, Power integrity is important. For example, for GHz circuits, it can become necessary to block high frequency noise components from radiating or coupling to the analog Power Plane. Otherwise, operation of sensitive analog blocks or critical signals can be degraded.

  • Compact Electromagnetic Bandgap structure for noise suppression in Power Plane
    2008 Electrical Design of Advanced Packaging and Systems Symposium, 2008
    Co-Authors: Hanumantha Rao Patnam, S. Karunakaran, Madhavan Swaminathan
    Abstract:

    A compact reduced size new electromagnetic bandgap (EBG) structure with the combination of AIEBG and multiple narrow slits in Power Plane is presented. Low on-set frequency is realized by concatenating 2 × 2 high frequency unit cells into a low frequency EBG unit cell without changing the over all dimensions of the EBG. Newly designed EBG operates over a frequency band of 0.9 GHz to 3.5 GHz with a good isolation of better than -40 dB over the band with 2 × 2 unitcells. The impedance of the structure is also presented, which is less than one ohm over the stop band of the EBG. Both the simulation and the measured results are compared and presented.

Ying-ern Ho - One of the best experts on this subject based on the ideXlab platform.

  • Stitching impedance analysis of LPDDR Power Plane split and its impact to radio frequency interference (RFI) and signal integrity (SI)
    2017 IEEE 26th Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS), 2017
    Co-Authors: Ying-ern Ho, Jun Liao
    Abstract:

    This paper presents low-Power double data rate 5 (LPDDR5) Power Plane stitching impedance impact to radio frequency interference (RFI) and Signal Integrity (SI). LPDDR5 Power Plane split causes RFI and SI degradation, but can be mitigated through appropriate Power Plane stitching impedance. It is found that stitching capacitor's impedance needs to be less than 10 ohm to minimize RFI and SI degradation. With stitching impedance as low as 0.5 ohm, (a) RFI is suppressed by ~20dB, (b) near end and far end crosstalk (NEXT and FEXT) are reduced by ~45mV, while (c) eye height (EH) and eye width (EW) improved by 57mV and 31ps respectively. These findings are helpful in improving radio performance of the system and increasing the LPDDR memory speed bin of mobile device.

  • Optimal decoupling strategy to suppress radio frequency interference (RFI) from double data-rate (DDR) memory Power-Plane radiation
    2017 IEEE International Symposium on Electromagnetic Compatibility & Signal Power Integrity (EMCSI), 2017
    Co-Authors: Ying-ern Ho
    Abstract:

    This paper presents an effective decoupling strategy to reduce radio frequency interference (RFI) noise from Power Plane of double data-rate (DDR) memory. Dual-referencing routing with both Power and ground Plane is widely used in DDR memory but prone to RFI radiation. Simulations are conducted to show a) self-resonance of capacitor significantly enhances effectiveness of decoupling, b) impedance of decoupling capacitor needs to be less than 1 Ω, and c) decoupling capacitors need to be 4-mm away from the trace ends. The effectiveness of this decoupling approach is validated with experiments. These recommendations may be used to reduce RFI risk from dual-referencing and relax the design constraints for mobile devices.

Hui-fen Huang - One of the best experts on this subject based on the ideXlab platform.

  • A Hierarchical Tree Shaped Power Distribution Network Based on Constructal Theory for EBG Structure Power Plane
    Progress in Electromagnetics Research B, 2020
    Co-Authors: Hui-fen Huang
    Abstract:

    In this paper, a tree-shaped Power distribution network is designed based on constructal theory for planar EBG structure Power Plane on PCB, in order to optimize DC performance. Planar EBG structures suppress noise, and the network provides currents to them. This network is composed of hierarchical metal paths. The geometric parameters can be optimized based on the concept of constructal theory. The optimal performance consists of constructing the given area in a sequence of building blocks from the smallest size toward larger sizes hierarchically. In the meantime, a PCB Power Plane is developed with 2nd order tree-shaped constructal network. Analysis illustrates that EBG Power Plane with constructal tree shaped network has multifunctions of low voltage drop, current equidistribution and efiective noise isolation.

  • A constructal H shaped Power distribution network for EBG structure Power Plane
    2012 Asia-Pacific Symposium on Electromagnetic Compatibility, 2012
    Co-Authors: Hui-fen Huang, Yan Zhang
    Abstract:

    In this paper, an H-shaped Power distribution network is designed based on constructal theory for EBG structure in PCB Power Plane, to optimize the direct current performance. EBG structures provide noise suppression performance and the network provides currents. This network is composed of hierarchical metal paths, and the geometric parameters can be optimized according to constructal theory. The optimal performance consists of constructing the giving area in a sequence of building blocks from the smallest size toward larger sizes hierarchically. In the meantime, a PCB Power Plane is developed based on the 2nd order H-shaped constructal network which illustrates that EBG Power Plane with H-shaped network has multifunctions of low voltage drop, current equidistribution and effective noise isolation.

  • Ferrite layer and high dielectric constant BaTiO3 for Power integrity
    2012 IEEE Electrical Design of Advanced Packaging and Systems Symposium (EDAPS), 2012
    Co-Authors: Hui-fen Huang, Shao-fang Zhang
    Abstract:

    In mixed-signal systems, effective noise isolation between analog and digital circuits is required for Power integrity (PI). In this paper, Ferrite absorb material layer is deposited under the Power Plane to absorb high frequency noise from 500 MHz to 10 GHz. High dielectric constant nano BaTiO3 is used between the Power Plane and the ground for large buried capacitance to filter high frequency noise. First, noise isolation for High Dielectric Constant BaTiO3 Substrate is researched. Then, noise isolation for Ferrite Absorb Material researched. Third, the above two noise isolation are combined to form the designed technique. The designed Power / ground structure from top to bottom is Power Plane / Ferrite / nano BaTiO3 / Ground. The noise isolation is greatly improved for the designed Power / ground structure than that for FR4 substrate without ferrite absorb material layer. In the mean time, the signal integrity effect is simulated, and the designed Power / ground structure causes no signal integrity problem.

  • Vein Power Plane for Printed Circuit Board Based on Constructal Theory
    IEEE Transactions on Electromagnetic Compatibility, 2011
    Co-Authors: Hui-fen Huang
    Abstract:

    In this paper, a novel vein Power tree design technique based on constructal theory is introduced for optimal direct current performance. The designed vein tree has multifunctions of low electrical resistance, equidistribution, and compactness. In the meantime, a vein Power Plane based on the vein tree is developed for printed circuit board. The designed vein Power Plane example illustrates that the vein Power Plane has the properties of low voltage drop, voltage contour robustness, equidistribution, compactness, and effective noise isolation while maintaining a relatively simple design of geometry.

  • The constructal optimization for tree-shaped structures on a disc Power Plane
    2011 IEEE Electrical Design of Advanced Packaging and Systems Symposium (EDAPS), 2011
    Co-Authors: Hui-fen Huang, Mao Ye
    Abstract:

    In this paper, a disc-shaped Power tree is optimized by minimizing the overall resistance under the condition of the fixed entire disc area and the given tree structure. The resistance as function of geometry parameters and the pairing level n (complexity) is obtained. Then a disc Power Plane is designed based on the designed disc-shaped Power tree. The DC performances for solid Plane and the designed Plane in this paper are compared. The research results illustrate that the designed disc Power Plane has multifunctions of equidistribution, low voltage drop, compactness and wideband noise isolation while maintaining a relatively simple design of geometry.