A New Approach for Time-Domain Analyzing High-Speed Digital Transmission Lines

2005 ◽  
Author(s):  
S. Qi ◽  
Q. Yang
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
High Speed ◽  
Digital Transmission ◽  
New Approach

scholarly journals Assessment of 50%-Propagation-Delay for Cascaded PCB Non-Linear Interconnect Lines for the High-Rate Signal Integrity Analysis

2013 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
T. Eudes ◽  
B. Ravelo ◽  
R. Al-Hayek
Keyword(s):  
Transfer Function ◽  
Transmission Lines ◽  
Time Domain ◽  
High Speed ◽  
Signal Integrity ◽  
Frequency Dispersion ◽  
Propagation Delay ◽  
High Rate ◽  
Propagation Time ◽  
Time Assessment

This paper presents an enlarged study about the 50-% propagation-time assessment of cascaded transmission lines (TLs). First and foremost, the accurate modeling and measurement technique of signal integrity (SI) for high-rate microelectronic interconnection is recalled. This model is based on the reduced transfer function extracted from the electromagnetic (EM) behavior of the interconnect line RLCG-parameters. So, the transfer function established takes into account both the frequency dispersion effects and the different propagation modes. In addition, the transfer function includes also the load and source impedance effects. Then, the SI analysis is proposed for high-speed digital signals through the developed model. To validate the model understudy, a prototype of microstrip interconnection with w = 500 µm and length d = 33 mm was designed, simulated, fabricated and tested. Then, comparisons between the frequency and time domain results from the model and from measurements are performed. As expected, good agreement between the S-parameters form measurements and the model proposed is obtained from DC to 8 GHz. Furthermore, a de-embedding method enabling to cancel out the connectors and the probe effects are also presented. In addition, an innovative time-domain characterization is proposed in order to validate the concept with a 2.38 Gbit/s-input data signal. Afterwards, the 50-% propagation-time assessment problem is clearly exposed. Consequently an extracting theory of this propagation-time with first order RC-circuits is presented. Finally, to show the relevance of this calculation, propagation-time simulations and an application to signal integrity issues are offered.

Frequency and Time-Domain Performance of LTCC Transmission Lines Fabricated Using Multiple Printing Techniques

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000047-000053
Author(s):  
J. Phillip Bailey ◽  
Michael D. Glover ◽  
Emmanuel Decrossas ◽  
Kaoru Porter ◽  
Tom Cannon ◽  
...  
Keyword(s):  
Cross Sections ◽  
Transmission Lines ◽  
Time Domain ◽  
High Frequency ◽  
High Speed ◽  
Digital Signal ◽  
Simulation Models ◽  
Advantages And Disadvantages ◽  
Lower Insertion Loss ◽  
Printing Techniques

The many advantages of low temperature co-fired ceramic (LTCC) materials are increasing their use in multi-layer systems containing multiple high-frequency / high-speed digital interconnects. Although construction of such interconnects is possible with current fabrication techniques, the loss exhibited by transmission lines at high frequencies limits their application by increasing system power consumption or requiring complex transceivers. Use of non-standard metal printing processes provides one possibility for realizing lower insertion loss desired for these interconnects. We have fabricated and evaluated representative single-ended and differential stripline transmission line structures using single, double, and mirror printing techniques for Ag metalization in DuPont 9K7 LTCC, to explore their suitability for high-frequency/high-speed applications. Discussion of analysis performed on cross-sections of these structures to determine post-firing geometry, as well as the level of fabrication control afforded over these parameters will be presented. To predict their performance for high-speed interconnects, 3D electromagnetic (3DEM) simulation models for characterizing the frequency performance of single-ended and differential structures have been also been developed. These 3DEM models have also been used in time domain simulations to verify digital signal capability by demonstrating structure performance at data rates exceeding 25 Gbps. Measurements of fabricated structures corresponding to the 3DEM models have also been performed in both the time and frequency domain and will be compared to the simulation results to confirm 3DEM model accuracy. The culmination of results from simulation and measurement will be used to present the differences, advantages, and disadvantages of each fabrication technique.

scholarly journals Intelligent Control For Locating Fault in Transmission Lines

2011 ◽  
pp. 169-175
Author(s):  
Abhijit A Dutta ◽  
M.M. Rao ◽  
A.N. Kadu
Keyword(s):  
Intelligent Control ◽  
Transmission Lines ◽  
High Speed ◽  
Normal System ◽  
Data Sets ◽  
Neural Network Approach ◽  
New Approach ◽  
Abrupt Changes ◽  
Frequency Components ◽  
New Generation

This paper presents a new approach for locating fault in transmission line using intelligent control relaying. Fault must be detected at its inception by issuing an output signal indicating this condition. Neural network approach for locating fault can be posed as a pattern-recognition to recognize pure sinusoidal signals as indicators of a normal system condition; abrupt changes of amplitude, phase, or the presence of transient components as indicators of fault. This method uses the fundamental frequency components of voltage and current basically current at pre-fault and post fault condition, measured at each phase from any one end of the selected power system. In this approach the data sets were trained using the available data from the system which comprises of different fault types data, and fault inception angles. This approach of locating fault using intelligent control can be used for supporting a new generation of very high speed protective relaying system.

Phasor-based fault location challenges and solutions for transmission lines equipped with high-speed time-domain protective relays

2020 ◽  
Vol 189 ◽  
pp. 106617
Author(s):  
Felipe V. Lopes ◽  
Eduardo Jorge S. Leite ◽  
João Paulo G. Ribeiro ◽  
Artur B. Piardi ◽  
Renzo G. Fabián Espinoza ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
High Speed ◽  
Fault Location ◽  
Protective Relays

A Novel Transient Directional Unit Based on Adaptive Median Filtering

2012 ◽  
Vol 433-440 ◽  
pp. 4500-4505
Author(s):  
Ren Wang He ◽  
Yi Bo Yang
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Traveling Wave ◽  
High Speed ◽  
Power Transmission ◽  
Median Filtering ◽  
Power Transmission Lines ◽  
Short Period ◽  
Transient Energy ◽  
The Time Domain

A new transient directional unit for extra high voltage(EHV) power transmission lines is proposed, which identifies fault direction by means of comparing the time-domain transient energy of the forward traveling-wave with that of the backward one in the very short period of time after fault occurs. The unit algorithm is designed with the technology of adaptive median filtering, which is first employed to process the forward and backward traveling-waves, and then calculates the time-domain transient energy ratio of the forward traveling-wave to the back one, by which the fault direction is discriminated. Numerous ATP-EMTP simulation tests show that this proposed directional unit not only operates reliably, sensitively and ultra-high-speed, but also endure the influences of various factors, including different fault types, fault locations, transition resistances or fault inception angles. It will be worthy of application greatly.

Time-domain analysis of dispersive transmission lines

1993 ◽  
Vol 3 (3) ◽  
pp. 581-591 ◽  
Author(s):  
Wojciech Gwarek ◽  
Malgorzata Celuch-Marcysiak
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis

Yaw Galloping of a TLWP Platform Under High Speed Currents by Analytical Methods and its Comparison With Experimental Results

2017 ◽  
Author(s):  
Francisco Lamas ◽  
Miguel A. M. Ramirez ◽  
Antonio Carlos Fernandes
Keyword(s):  
High Speed ◽  
Production Systems ◽  
Experimental Tests ◽  
Experimental Results ◽  
Analytical Methodology ◽  
New Approach ◽  
Laboratory Facilities ◽  
Polynomial Curve ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Analyses

Flow Induced Motions are always an important subject during both design and operational phases of an offshore platform life. These motions could significantly affect the performance of the platform, including its mooring and oil production systems. These kind of analyses are performed using basically two different approaches: experimental tests with reduced models and, more recently, with Computational Fluid Dynamics (CFD) dynamic analysis. The main objective of this work is to present a new approach, based on an analytical methodology using static CFD analyses to estimate the response on yaw motions of a Tension Leg Wellhead Platform on one of the several types of motions that can be classified as flow-induced motions, known as galloping. The first step is to review the equations that govern the yaw motions of an ocean platform when subjected to currents from different angles of attack. The yaw moment coefficients will be obtained using CFD steady-state analysis, on which the yaw moments will be calculated for several angles of attack, placed around the central angle where the analysis is being carried out. Having the force coefficients plotted against the angle values, we can adjust a polynomial curve around each analysis point in order to evaluate the amplitude of the yaw motion using a limit cycle approach. Other properties of the system which are flow-dependent, such as damping and added mass, will also be estimated using CFD. The last part of this work consists in comparing the analytical results with experimental results obtained at the LOC/COPPE-UFRJ laboratory facilities.

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