Variable Thickness Circuit Board for Signal Integrity
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Solution Overview
Problem
Signal degradation occurs as conductive vias pass signals through printed circuit boards, particularly exacerbated by increased signal speeds and via lengths, which existing technologies fail to adequately address.
Innovation Solution
The circuit board structure incorporates thinner substrate areas with shorter vias and pockets to reduce signal degradation, featuring a backing plate for reinforcement and an interposer for micro-compliant electrical paths, allowing for efficient transmission of high-speed signals while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If via length is increased to maintain structural integrity, then structural strength is improved, but signal degradation increases
Solution Approach 1:
The substrate is designed with different thicknesses in different areas: thinner in first areas carrying high-speed signals to reduce via length and signal degradation, and thicker in second areas carrying lower-speed signals to maintain structural strength. This local differentiation resolves the contradiction by optimizing each area for its specific function.
2Reliability
If substrate thickness is reduced to shorten via length, then signal degradation is reduced, but structural integrity deteriorates
Solution Approach 1:
The substrate implements variable thickness with thinner regions (first areas) for high-speed signal paths and thicker regions (second areas) for structural support and lower-speed signals. This local quality variation allows the substrate to simultaneously achieve short via lengths for signal integrity and sufficient thickness for structural integrity.
Solution Approach 2:
The substrate is segmented into different thickness zones: first areas with reduced thickness for high-speed signals and second areas with greater thickness for structural support. This segmentation allows each zone to be optimized independently for its specific requirements.
3Strength
If via length is increased for lower-speed signals, then structural support is improved, but signal degradation increases for high-speed signals
Solution Approach 1:
The substrate design creates local thickness variations where first areas have reduced thickness to minimize via length for high-speed signals, while second areas maintain greater thickness for structural support and lower-speed signals. This ensures high-speed signals benefit from shorter paths without compromising overall structural support.
Data Source
AI summary
An example circuit board structure includes: a substrate; and vias that are electrically conductive and that pass through the substrate to enable electrical connection through the circuit board structure. The substrate is thinner, and lengths of the vias are shorter, in first areas of the circuit board structure that deliver first speed signals than in second areas of the circuit board structure that deliver second speed signals and power. The first speed signals have a shorter rise time than the second speed signals.