PCIe Connector Terminal Layout for Lower Far-End Crosstalk
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Solution Overview
Problem
Conventional PCIe connectors are unable to transmit higher frequency signals required by the evolving PCIe protocol, necessitating a design that enhances high-frequency performance.
Innovation Solution
The electrical connector features differential terminal pairs with specific distance configurations and ground terminals to reduce far-end crosstalk, along with insulating protrusions and conductive plastic arrangements to optimize impedance matching and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCIe connector designs are used, then manufacturing simplicity is maintained, but high-frequency signal transmission capability deteriorates
Solution Approach 1:
The connector is divided into multiple functional segments: differential terminal pairs for signal transmission, ground terminals for reference potential, insulating protrusions for impedance control, and conductive plastic for shielding. Each segment is optimized independently for high-frequency performance while maintaining overall integration.
Solution Approach 2:
Different regions of the connector are assigned different structural characteristics: the signal transmission region features precise differential terminal pair spacing, the grounding region has dedicated ground terminals, the insulating regions have protrusions for impedance matching, and the shielding regions have conductive plastic. This local optimization enables high-frequency performance without requiring complete structural redesign.
2Volume of moving object
If differential terminal pairs are positioned closer together, then device compactness is improved, but far-end crosstalk increases
Solution Approach 1:
Ground terminals are positioned between adjacent differential terminal pairs to act as electromagnetic shielding intermediaries. These ground terminals block far-end crosstalk between signal pairs while allowing the connector to maintain a compact form factor. The insulating protrusions further mediate the electromagnetic field distribution to minimize coupling between adjacent pairs.
Solution Approach 2:
The problem of crosstalk in the lateral dimension is addressed by introducing grounding in the longitudinal dimension. Ground terminals extend along the insertion direction to provide continuous reference potential, effectively compartmentalizing the electromagnetic fields of adjacent differential pairs and reducing far-end crosstalk while maintaining compact lateral spacing.
3Reliability
If impedance matching is optimized for high-frequency signals, then signal transmission quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
Insulating protrusions are pre-formed in the insulating block at predetermined positions and dimensions during the molding process. These protrusions preliminarily establish the impedance characteristics of the signal transmission path, allowing subsequent terminal assembly to focus on electrical connection rather than impedance shaping, thereby reducing overall manufacturing precision requirements while maintaining signal quality.
Solution Approach 2:
The impedance characteristics are controlled by adjusting geometric parameters of the insulating protrusions (height, width, position) and the spacing between differential terminals. By changing these physical parameters during design, the characteristic impedance can be optimized for high-frequency signals without requiring extremely tight manufacturing tolerances, as the impedance is primarily determined by the overall geometry rather than fine dimensional adjustments.
Data Source
AI summary
The present invention discloses an electrical connector and a connector assembly. The connector assembly includes an electrical connector, a mating component and a circuit board. The electrical connector includes a plurality of differential terminal pairs and at least one ground terminal. Each differential terminal pair includes two signal terminals. Each signal terminal includes a first contact portion, a first conductive portion and a first connecting arm. For the differential terminal pair, a central distance between the two first contact portions is greater than a central distance between the two first connecting arms, and the central distance between the two first contact portions is greater than a central distance between the two first conductive arms, such that the differential terminal pair forms a good differential coupling, and the distance between adjacent differential terminal pairs is increased, thereby reducing the far-end crosstalk between the differential terminal pairs.