Balanced-to-Differential Transition Structure for 100 Gbps Signal Integrity
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Solution Overview
Problem
Existing differential lines in digital circuits face limitations in maximum transmission speed due to phase unbalance, signal interference, and electromagnetic interference, which restrict digital signal transmission to approximately 15 Gbps, hindering advancements in higher speed transmission.
Innovation Solution
A transition structure connecting balanced lines to differential lines using optimized designs with dielectric substrates, maintaining a phase difference of 180°, and employing various-shaped transition structures to enhance signal integrity and suppress electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a differential line structure is used for digital signal transmission, then the transmission can be implemented with simple structure, but the maximum transmission speed is limited to approximately 15 Gbps due to phase unbalance and electromagnetic interference
Solution Approach 1:
A transition structure serving as an intermediary component is introduced between the differential line and balanced line. This transition structure includes conductive elements and dielectric layers that facilitate smooth signal transformation while maintaining impedance matching, thereby eliminating phase unbalance and reducing electromagnetic interference during the transition process
Solution Approach 2:
The invention changes the structural parameters of the transmission line by transforming from a differential line configuration to a balanced line configuration through the transition structure. This parameter change includes modifying the geometric arrangement of conductors and adjusting dielectric properties to achieve optimal signal transmission characteristics at ultra-high speeds
2Speed
If a balanced line is used to achieve ultra-high-speed transmission, then the transmission speed can reach approximately 100 Gbps, but the device complexity increases due to the transition structure design
Solution Approach 1:
The transition structure is segmented into distinct functional layers including conductive elements, dielectric layers, and ground structures. Each layer performs a specific function in the signal transformation process, allowing for optimized design of individual components while maintaining overall system performance for ultra-high-speed transmission
3Reliability
If the line length difference between two differential lines occurs, then the differential line structure is simple to implement, but phase unbalance is generated causing signal radiation and loss
Solution Approach 1:
The transition structure acts as an intermediary that receives differential signals from lines of different lengths and transforms them into balanced line signals. This transformation process compensates for the phase differences caused by line length variations, preventing signal radiation and loss while maintaining signal integrity
Data Source
AI summary
The disclosure relates to transition structures for digital signal transmission and digital transmission lines including the same for transmitting digital signals at an ultra-high speed of approximately 100 Gbps. According to the present disclosure, it is possible to transmit digital signals at ultra-high speed while solving problems such as interference between lines or phase difference 180° of existing differential lines by connecting balanced lines to differential lines with two lines of opposite polarities using optimized transition structures of various shapes or digital transmission lines with a plurality of dielectric substrates.