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2023
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04
A high-density connector used in the field of differential data transmission
We can see that after the transition from an auxiliary function computer environment to a networked user server enterprise, the data signal transmission speed in the network system has increasingly become a major bottleneck restricting the performance improvement of the network system. Accompanied by the vigorous rise of some new technologies (video conferencing, graphical interface, etc.) and the improvement of PC performance brought about by high-speed servers, network communication systems use differential signals to achieve 1Gbit or even higher data network performance requirements. IEEE 802 is currently studying and formulating the 1.026 Gbit Ethernet standard to meet the requirements of this emerging technical specification.
We can see that after the transition from an auxiliary function computer environment to a networked user server enterprise, the data signal transmission speed in the network system has increasingly become a major bottleneck restricting the performance improvement of the network system. Accompanied by the vigorous rise of some new technologies (video conferencing, graphical interface, etc.) and the improvement of PC performance brought about by high-speed servers, network communication systems use differential signals to achieve 1Gbit or even higher data network performance requirements. IEEE 802 is currently studying and formulating the 1.026 Gbit Ethernet standard to meet the requirements of this emerging technical specification.
One of the key constraints for switch, hub and server manufacturers is the use of backplane connectors. This is a non-coaxial, non-optical, low-cost differential data transmission connector that allows data signals to be transmitted at G-bit speeds and whose matching characteristic impedance meets the specified requirements.
Recently, Japan Fujitsu Components Company has developed a new type of high-density connector for differential data transmission to meet the above technical requirements. This new connector system adopts a stripline structure arrangement suitable for differential signal transmission, that is, several bellows contacts are installed between large ground plates, so that signal crosstalk between adjacent signal pairs can be reduced . This configuration utilizes a centerline spacing of 0.635mm (0.025'). The use of dedicated shielded cables and cost-effective assembly methods are also important for gigabit data transmission speeds.
Historical trends in the computer industry have led to technical requirements for higher speed networks, ie faster data transfer rates. To meet these technical requirements, the network system must be able to provide users with a signal transmission rate of 1G or even higher.
In the past, design engineers did not pay much attention to the signal transmission path of connectors due to the short transmission path of electrical signals compared with cables or PCB assemblies. However, in some applications utilizing high-frequency signals, connectors are no longer an insignificant electrical component. We have to design them to have the best performance and minimize the noise impact of their crosstalk and magnetic susceptibility.
Single-ended transmission is a very common signal transmission method for computers and their peripherals. This is mainly due to its high cost-efficiency ratio, however, this transmission method is extremely susceptible to interference from surrounding noise. Therefore, its immunity to noise and signal integrity become the driving force behind the application of this connector specification in differential signal transmission systems. This technical requirement has now become the key to high-speed signal transmission applications such as networking systems. The establishment of computer systems requires new high-density connectors to meet the needs of high-speed data transmission.
This article will introduce the design concept and related electrical performance of this newly developed high-density connector for differential data transmission.
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