scholarly journals Optimization and Design of Passive Link with Single Channel 25 Gbps Based on High-Speed Backplane

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1773
Author(s):  
Jie Liu ◽  
Kai Zhang ◽  
Qiang Wu ◽  
Li Peng ◽  
Kai Yao ◽  
...  
Keyword(s):  
Insertion Loss ◽  
High Speed ◽  
Return Loss ◽  
Single Channel ◽  
Transmission Rate ◽  
Coplanar Waveguide ◽  
Reference Plane ◽  
Equivalent Circuit Analysis ◽  
The Impact ◽  
Impedance Fluctuation

In recent years, with the development of the communication industry, the need to use Ethernet switches to transmit big data has become more urgent, and its protocol standards are iterating towards higher return loss, wider bandwidth, lower impedance fluctuations and insertion loss. Based on the research of high-speed backplane with a single channel 25 Gbps transmission rate, a novel double grounded planar strip coplanar waveguide design is presented, which significantly improved return loss to 20 dB and reduced insertion loss, which meet the loss standard of 100GBASE-KR4. The resonant cavity model of transmission line reference plane is improved by introducing vias and the parameters of vias in the reference plane are studied to reduce the impact of resonance, which improved the transmission –1 dB bandwidth to 60 GHz. Based on equivalent circuit analysis of differential vias’ joint reverse pad, the parameters related to the differential vias are studied, the impedance fluctuation is reduced to 100 ± 3 Ω, which is 70% better than the impedance fluctuation standard (100 ± 10 Ω) of 100GBASE-KR4. After optimizing the mathematical model of strip coplanar waveguide, reference plane and differential vias, we built a simulation model of the backplane passive link which met the 100GBASE-KR4 backplane Ethernet specification. In the actual test, it was found that the optimized model can improve the link performance.

Compact transition from CBCPW to substrate integrated suspended line (SISL) for operation up to 46 GHz

2019 ◽  
Vol 12 (2) ◽  
pp. 116-119
Author(s):  
F. Parment ◽  
A. Ghiotto ◽  
T.-P. Vuong ◽  
L. Carpentier ◽  
K. Wu
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Coplanar Waveguide ◽  
Experimental Results ◽  
Frequency Range ◽  
Better Than

AbstractA compact transition between conductor-backed coplanar waveguide (CBCPW) and substrate integrated suspended line (SISL) is presented. Compared to the reported transitions from CBCPW to SISL, performance and compactness are improved. For demonstration purpose, a multilayer transition is designed and fabricated for operation up to 46 GHz. Experimental results, based on an electronic calibration and thru–reflect–line calibration allowing measurement in the 0.01–50 GHz frequency range, demonstrate an insertion loss of 0.59 ± 0.51 dB with a return loss of better than 10 dB in the 10 MHz to 46 GHz frequency range.

scholarly journals Impact of twisting rate in 10 pairs of unshielded twisted-pair copper cables on insertion loss and crosstalk coupling for G.fast technology

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Saizalmursidi Md Mustam ◽  
Mohammad Arif Ilyas ◽  
Muhammad Syukri Mohd Yazed ◽  
Che Ku Afifah Che Ku Alam
Keyword(s):  
Insertion Loss ◽  
High Speed ◽  
Digital Subscriber Line ◽  
Broadband Internet ◽  
Twisted Pair ◽  
Distribution Point ◽  
Model Reliability ◽  
The Impact ◽  
Access Services ◽  
Published Result

An ultrafast digital subscriber line (DSL) technology called G.fast is important for ultrafast broadband Internet access services. In G.fast, the existing cable bundles installed for 250 m from the distribution point to the customer’s premises are used to support the gigabit data transmission (aggregated 1 Gbit/s) for frequency up to 106 MHz or 212 MHz. Since unshielded cable is used, and the frequency is 12 times higher compared to the very high-speed DSL2 (VDSL2), it is important to investigate the cable performance in terms of insertion loss and crosstalk coupling. In this paper, the impact of cable twisting rate on 10 pairs of unshielded twisted-pair copper cables for a small copper bundle on insertion loss and crosstalk coupling is investigated. A simulation model is developed based on the standard cable installed in Malaysia. The model reliability is validated by comparing the obtained result with the published result in the literature. Besides, the twisting rate of 100 m cable is manipulated by changing its lay size to determine its impact on insertion loss and crosstalk coupling. The results showed that a high twisting rate can reduce the far-end crosstalk but increase both the insertion loss and near-end crosstalk.

System Co-Design Modeling Methodology of a High Speed (25Gbps) Multi-Rate 4-Channel Retimer: Simulation to Measurement Correlation

2018 ◽  
Vol 2018 (1) ◽  
pp. 000180-000185
Author(s):  
Tony Tang ◽  
Bridger Wray ◽  
Rajen Murugan
Keyword(s):  
Modeling And Simulation ◽  
Insertion Loss ◽  
Power Supply ◽  
High Speed ◽  
Return Loss ◽  
Electrical Performance ◽  
Laboratory Measurements ◽  
Simulation Methodology ◽  
Modeling Methodology ◽  
Bga Package

Abstract In this paper we detail the system (viz. silicon-package-pcb) electrical co-design of a 130nm BiCMOS high-speed (25Gbps) 4-channel multi-rate retimer, packaged in a small 6-mm × 6-mm FC BGA package, with integrated advanced signal conditioning circuitries. Electrical optimization of the silicon-package-pcb over the high speed channels, to achieve desired performance, was achieved through a coupled circuit-to-electromagnetic co-design modeling and simulation methodology. Key figure of merits for system electrical performance (viz. insertion loss, return loss, crosstalk/isolation, jitter, and power supply inductance and resistance parasitics, among others) are modeled and analyzed. Laboratory measurements on a retimer are presented that validate the integrity of the modeling methodology. Good correlation between modeling methodology and laboratory measurements is achieved.

Intra-channel Cross-Phase Modulation Effect in Dispersion Compensated Single Channel Lightwave System with Negative Residual Dispersion

2015 ◽  
Vol 36 (3) ◽  
Author(s):  
Nitu Syed ◽  
Mohammad Faisal
Keyword(s):  
Phase Shift ◽  
Phase Modulation ◽  
High Speed ◽  
Single Channel ◽  
Optical Fiber Communication ◽  
Cross Phase Modulation ◽  
Fiber Communication ◽  
Transmission Distance ◽  
Analytical Estimation ◽  
The Impact

AbstractAdvanced modulation schemes, particularly the phase-modulated signals, have already drawn huge research interests for ultra-high speed long-haul lightwave transmission systems. We have considered 40 Gbit/s optical RZ pulse propagating in a periodically dispersion managed (DM) single channel system with negative residual dispersion. We investigate the effects of negative residual dispersion on intra-channel cross-phase modulation (IXPM)-induced phase shift. Analytical estimation for phase shift has been deduced using perturbed variational formulation. We therefore explore the impact of variation of various parameters such as transmission distance, duty cycle, bit rate, etc. on phase shift. The outcome of our work is to explore the performance of the dispersion compensated system with some negative residual dispersion so that the IXPM-induced phase shift remains low in optical fiber communication.

Demonstration of a high-speed switch with coplanar waveguide electrodes based on electro-optic polymer-clad waveguides

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 67646-67651 ◽  
Author(s):  
Xi-Bin Wang ◽  
Jing-Wen Sun ◽  
Jian Sun ◽  
Zuo-Sen Shi ◽  
Fei Wang ◽  
...  
Keyword(s):  
Insertion Loss ◽  
High Speed ◽  
Coplanar Waveguide ◽  
Wet Etching ◽  
Zehnder Interferometer ◽  
Electro Optic ◽  
Low Insertion Loss ◽  
High Speed Switching ◽  
Mach Zehnder Interferometer

A Mach–Zehnder interferometer type of optic switch with electro-optic polymer-clad waveguides was fabricated with the simple wet-etching procedure, which exhibited low insertion loss and high-speed switching response.

Impact of non-perfect reference plane on multi-gigabit transmission

2017 ◽  
Vol 14 (4) ◽  
pp. 342-347
Author(s):  
Chang Fei Yee ◽  
Asral Bahari Jambek ◽  
Azremi Abdullah Al-Hadi
Keyword(s):  
High Speed ◽  
Negative Impact ◽  
Signal Integrity ◽  
Time Domain Reflectometry ◽  
Circuit Board ◽  
Reference Plane ◽  
Design System ◽  
Second Phase ◽  
Content Type ◽  
The Impact

Purpose This paper aims to analyze the impact of non-perfect reference plane on the integrity of microstrip differential signals at multi-gigabit transmission on a printed circuit board (PCB). The effects of non-perfect reference contributed by signal crossing over split plane such as impedance discontinuity and crosstalk are investigated by performing analysis in two phases. Design/methodology/approach The first phase involves three-dimensional electromagnetic modeling extraction using Keysight EMPro software. Meanwhile, the second phase involves the import of model extracted from EMPro into simulation using Keysight Advanced Design System that covers insertion loss, return loss, crosstalk, time domain reflectometry and eye diagram. Findings A non-perfect reference plane has a negative impact on signal reflection, attenuation and crosstalk. The analysis results are presented and discussed in detail in the later section of this paper. Originality/value The work that studied the impact of the width and the amount of gaps due to crossing of split planes being experienced on the signal integrity was performed by other researchers. Meanwhile, this paper focused on the impact of length and depth of the gap on signal integrity. These research papers serve as a reference guide for high-speed PCB layout design.

Modeling of Tread Block Contact Mechanics Using Linear Viscoelastic Theory3

2008 ◽  
Vol 36 (3) ◽  
pp. 211-226 ◽  
Author(s):  
F. Liu ◽  
M. P. F. Sutcliffe ◽  
W. R. Graham
Keyword(s):  
High Speed ◽  
Slip Rate ◽  
Material Model ◽  
Contact Forces ◽  
Block Modeling ◽  
Rate Dependent ◽  
Linear Viscoelastic Material ◽  
Linear Viscoelastic ◽  
The Impact ◽  
Good Agreement

Abstract In an effort to understand the dynamic hub forces on road vehicles, an advanced free-rolling tire-model is being developed in which the tread blocks and tire belt are modeled separately. This paper presents the interim results for the tread block modeling. The finite element code ABAQUS/Explicit is used to predict the contact forces on the tread blocks based on a linear viscoelastic material model. Special attention is paid to investigating the forces on the tread blocks during the impact and release motions. A pressure and slip-rate-dependent frictional law is applied in the analysis. A simplified numerical model is also proposed where the tread blocks are discretized into linear viscoelastic spring elements. The results from both models are validated via experiments in a high-speed rolling test rig and found to be in good agreement.

Case study: Prediction and field tests of railway noise and effects of a low-height noise barrier

2020 ◽  
Vol 68 (4) ◽  
pp. 303-314
Author(s):  
Yuna Park ◽  
Hyo-In Koh ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
...  
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Residential Areas ◽  
Railway Systems ◽  
Railway Noise ◽  
Sound Levels ◽  
Noise Barrier ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact

Railway noise is calculated to predict the impact of new or reconstructed railway tracks on nearby residential areas. The results are used to prepare adequate counter- measures, and the calculation results are directly related to the cost of the action plans. The calculated values were used to produce noise maps for each area of inter- est. The Schall 03 2012 is one of the most frequently used methods for the production of noise maps. The latest version was released in 2012 and uses various input para- meters associated with the latest rail vehicles and track systems in Germany. This version has not been sufficiently used in South Korea, and there is a lack of standard guidelines and a precise manual for Korean railway systems. Thus, it is not clear what input parameters will match specific local cases. This study investigates the modeling procedure for Korean railway systems and the differences between calcu- lated railway sound levels and measured values obtained using the Schall 03 2012 model. Depending on the location of sound receivers, the difference between the cal- culated and measured values was within approximately 4 dB for various train types. In the case of high-speed trains, the value was approximately 7 dB. A noise-reducing measure was also modeled. The noise reduction effect of a low-height noise barrier system was predicted and evaluated for operating railway sites within the frame- work of a national research project in Korea. The comparison of calculated and measured values showed differences within 2.5 dB.

Sign in / Sign up

Export Citation Format

Share Document