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High-speed parallel data transmission utilizing a flex-rigid concept
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Micronic Laser System Inc., P.O Box 3141, SE-183 03 Täby, Sweden.
2005 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Transmission lines utilizing microstrips on a flex-foil with low dielectric loss (tanδ = 0.002) have been simulated to compare with the transmission lines laminated with a rigid part, a so-called flex-rigid structure. At high speeds, even solders, pads and connectors affect the signal integrity because of their parasitic effects. The flex-rigid structure does not require these extra parts, resulting in good signal integrity and thus high data transfer rates. Another advantage with a flexible cable is that dense parallel microstrips can easily be designed. Although many wired data communications utilize serial techniques like Serial AT Attachment (SATA), Universal Serial Bus (USB) and Firewire, the serial data link has its limitations when very high data speeds are required. With a parallel data transmission technique, the data transfer rate can be raised to a very high speed. However, a parallel data transmission technique has some disadvantages such as crosstalk and skew between the signals which must be considered.

Place, publisher, year, edition, pages
2005. 206-209 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-32318Local ID: 18210OAI: oai:DiVA.org:liu-32318DiVA: diva2:253140
Conference
Gigahertz 2005, 8-9 September, Uppsala, Sweden
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-12-19
In thesis
1. Study of Wired and Wireless Data Transmissions
Open this publication in new window or tab >>Study of Wired and Wireless Data Transmissions
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The topic of this dissertation is divided into two parts where the first part presents high-speed data transmission on flexible cables and the second part presents a wireless remote monitoring and controlling system with wireless data transmission.

The demand on high-speed data communications has pushed both the wired and wireless technologies to operate at higher and higher frequencies. Classic Kirchhoff’s voltage and current laws cannot be directly applied, when entering the microwave spectrum for frequency above 1 GHz. Instead, the transmission line theory should be used. Most of the wired communication products use bit-serial cables to connect devices. To transfer massive data at high speed, parallel data transfer techniques can be utilized and the speed can be increased by the number of parallel lines or cables, if the transfer rate per line or cable can be maintained. However, the lines or cables must be well-shielded so the crosstalk between them can be minimized.

Differential lines can also be used to increase the data speed further compared to the single-ended lines, along with saving the power consumption and reducing the electromagnetic interference. However, characterization for differential lines is not as straight forward as for single-ended cases using standard S-parameters. Instead, mixed-mode S-parameters are needed to describe the differential-, common- and mixed-mode characteristics of the differential signal. Mixed-mode S-parameters were first introduced in 1995 and are now widely used. However, improvements of the theory can still be found to increase the accuracy of simulations and measurements, which is proposed and presented in this dissertation.

The interest of wireless solution to do remote control and monitoring for cultural building has been increasing. Available solutions on the market are mostly wired and very expensive. The available wireless solutions often offer limited network size with point-to-point radio link. Furthermore, the wired solution requires operation on the building, which is not the preferred way since it will damage the historical values of cultural heritage buildings. Wireless solutions on the other hand can offer flexibility when deploying the network, i.e., operation on the building can be avoided or kept to the minimum.

A platform for wireless remote monitoring and control has been established for various deployments at different cultural buildings. The platform has a modular design to ease future improvement and expansion of the system. The platform is based on the ZigBee standard, which is an open standard, specified with wireless sensor network as focus. Three different modules have been developed. The performance has been studied and optimized. The network has been deployed at five different locations in Sweden for data collection and verification of the system stability.

The remote monitoring and control functions of the developed platform have received a nomination for the Swedish Embedded Award 2010 and been demonstrated at the Scandinavia Embedded Conference 2010 in Stockholm.Communication

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 61 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1352
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-61298 (URN)978-91-7393-286-8 (ISBN)
Public defence
2010-12-15, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 09:34 (English)
Opponent
Supervisors
Available from: 2010-11-16 Created: 2010-11-11 Last updated: 2010-11-16Bibliographically approved
2. Flexible cables for massive-parallel high-speed data communications
Open this publication in new window or tab >>Flexible cables for massive-parallel high-speed data communications
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The demand for high-speed data communications has pushed both the wired and wireless technologies to operate at higher and higher frequencies. Classic Kirchhoffs voltage and current laws cannot be directly applied, when entering the microwave spectrum for frequency > 1 GHz. Instead, the transmission line theory should be used. Most of today's wired communication products use bit-serial cables to connect devices. To transfer massive data at high speed, parallel data transfer techniques can be utilized and the speed can be increased by the number of parallel lines or cables, if the transfer rate per line or cable can be maintained. However, the interference between the lines or cables must to be well-shielded so the crosstalk between them can be minimized.

Differential lines can also be used to increase the data speed further compared to the single-ended lines, along with saving the power consumption and reducing the electromagnetic interference. However, characterization for the differential lines is not as straight forward as that for the single-ended cases using standard S-parameters. Instead, mixed-mode S-parameters are needed to explain the differential-, common- and mixed-mode characteristics of the differential signal. The mixed-mode S-parameters were first introduced in 1995 and are now widely used. However, improvements of the theory can still be found to increase the accuracy of simulations and measurements.

This thesis presents a study of massive-parallel conductors on flexible cables. Furthermore, some connectors in combination with the flexible cable are studies for high-speed data transfer. The conversion method for mixed-mode Sparameters has been reviewed and a new method to improve the conversion accuracy has been proposed.

Place, publisher, year, edition, pages
Norrköping: Linköping University, 2006. 40 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1282
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-36192 (URN)30467 (Local ID)91-85643-44-0 (ISBN)30467 (Archive number)30467 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-12-19

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