Redriver Chip Pin Layout for Lower PCIe Crosstalk
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Solution Overview
Problem
Conventional redriver chips struggle to maintain sufficient transmission performance under new PCIe specifications, generating noise and requiring complex layout designs due to increased transmission rates and far-end crosstalk issues.
Innovation Solution
A redriver chip design with alternately arranged pre-stage and post-stage transmission and reception pin sets, along with selectors, reduces far-end crosstalk and simplifies layout by allowing for fewer circuit layers, enabling flexible installation of one or multiple chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If transmission rate is increased to meet new PCIe specifications, then transmission performance is improved, but noise generation increases and transmission quality deteriorates
Solution Approach 1:
The pin sets are segmented into pre-stage and post-stage groups with alternating arrangement. This segmentation separates transmission and reception functions spatially, reducing interference between signal paths while maintaining high transmission rates required by new PCIe specifications
Solution Approach 2:
The patent transitions from conventional grouped pin arrangements to an alternating dimensional pattern where pre-stage and post-stage pin sets are interleaved. This dimensional reorganization of pin layout reduces noise coupling while preserving high-speed transmission capability
2Ease of manufacture
If multiple transmission lines are arranged to overlap and then gathered according to redriver chip pin setting, then connection to redriver chip is achieved, but layout complexity increases and circuit layer changes increase
Solution Approach 1:
Instead of gathering transmission lines after routing and then connecting to pin settings, the patent inverts the approach by pre-organizing pin sets in alternating pre-stage and post-stage patterns. This inversion simplifies the routing process and reduces the need for complex circuit layer changes during manufacturing
Solution Approach 2:
The pin sets are pre-configured in an alternating arrangement pattern before the actual circuit board layout and routing processes. This preliminary organization of pin configurations simplifies subsequent manufacturing steps and reduces layout design complexity
3Area of stationary object
If transmission lines are separated by short distance, then space utilization is improved, but far-end crosstalk increases and transmission quality deteriorates
Solution Approach 1:
Transmission and reception pin sets are segmented and alternately arranged, creating natural spacing between signal paths. This segmentation reduces far-end crosstalk while maintaining compact space utilization on the circuit board
Data Source
AI summary
A redriver chip comprising: pre-stage transmission pin sets, pre-stage reception pin sets, post-stage transmission pin sets, post-stage reception pin sets and selectors. The pre-stage transmission pin sets and the pre-stage reception pin sets are disposed in alternating arrangement, and the post-stage transmission pin sets and the post-stage reception pin sets are disposed in alternating arrangement. The amount of the post-stage transmission pin sets is an integral multiple of the amount of pre-stage reception pin sets, and the amount of the pre-stage reception pin sets is an integral multiple of the pre-stage transmission pin sets. Each of the selectors is connected to one of the pre-stage reception pin sets and integral multiple amount of the post-stage transmission pin sets, or is connected to one of the pre-stage transmission pin sets and integral multiple amount of the post-stage reception pin sets.