High Speed Network Interface Isolation Circuit Design
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Solution Overview
Problem
High-speed data networks, particularly those operating at 10G BASE-T standards, face performance limitations due to suboptimal design and construction of isolation circuits in network interfaces, leading to inadequate insertion loss and return loss characteristics.
Innovation Solution
The integration of a transformer with multiple primary and secondary windings, where the wires are twisted together, and a common mode choke, within an electrical connector, enhances signal isolation and reduces insertion loss and return loss, thereby improving the performance of high-speed data networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional isolation circuit with single primary and secondary windings is used, then the device complexity is reduced, but the insertion loss and return loss characteristics deteriorate at high frequencies
Solution Approach 1:
The primary winding is divided into multiple parallel windings (first primary winding and second primary winding), and the secondary winding is divided into multiple parallel windings (first secondary winding and second secondary winding). This segmentation allows each individual winding to be shorter, reducing signal path length and improving high-frequency insertion loss characteristics while distributing the transformation function across multiple simpler components.
Solution Approach 2:
The patent embeds multiple windings within a single transformer component, where the first primary winding, second primary winding, first secondary winding, and second secondary winding are all nested within the same transformer housing. This nesting approach improves insertion loss by providing multiple parallel paths while containing the complexity within a single integrated component.
2Reliability
If standard transformer construction is used, then the manufacturing process is simplified, but signal distortion and erratic behavior occur at frequencies above 100 MHz
Solution Approach 1:
The patent applies different construction approaches to different windings within the same transformer. Specifically, the primary windings and secondary windings are constructed with different configurations and coupled through magnetic cores, allowing optimization of each winding's local characteristics for high-frequency performance while maintaining overall manufacturing feasibility.
Solution Approach 2:
The transformer employs composite construction combining multiple wire configurations (twisted pairs, parallel wires) and magnetic materials (ferrite cores) to achieve superior high-frequency signal transmission stability. The combination of different winding structures and magnetic coupling paths reduces signal distortion and eliminates erratic behavior at frequencies above 100 MHz.
3Reliability
If isolation circuits are not integrated into the connector, then the connector design is simpler, but electrical performance and signal isolation are inadequate
Solution Approach 1:
The patent merges the isolation circuit (transformer) directly into the connector assembly, integrating electrical isolation functionality with the mechanical connector structure. This combination ensures proper signal isolation and electrical performance while maintaining a compact, unified component design that is suitable for high-speed network interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides improved insertion loss and return loss characteristics, enabling the reliable transmission of high-frequency signals over 10G Ethernet networks with reduced signal distortion and erratic behavior.
Implementation Method 1
Each of the plurality of circuits may include at least a transformer coupled to one of the pairs of conductive elements. The transformers may have a first winding and a second winding.
Implementation Method 2
Either or both of the windings may be formed with at least two wires wound around a common core. In some embodiments, each of the wires of the first winding may be twisted together with a wire of the second winding.
Implementation Method 3
The isolation circuit may also include a common mode choke. A common mode choke tends to equalize signal levels on the legs forming a differential pair, which can improve electrical performance of the assembly.
Data Source
AI summary
A network interface adapted for high speed networks. The interface includes isolation circuits with a transformer containing two primary coils and two secondary coils. A wire making up each primary coil may be twisted with a wire making up a secondary. These two coils may then be co-wound on a common core. The transformer may be connected to a common mode choke. The isolation circuit may be packaged such that the transformer and coil are in a line, with isolation circuits for a plurality of pairs arranged in parallel. The interface circuit may be packaged in a connector housing, which also may be adapted for high speed performance. The housing may receive multiple isolation circuits in parallel. The housing may also include a mating contact portion in which mating contacts for signal conductors of each pair are positioned along the same side of a cavity.