Broadside PCB Floquet Resonance Estimation
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Solution Overview
Problem
Printed circuit boards with broadside stack-ups experience adverse coupling effects due to floquet mode resonant coupling, leading to undesirable insertion loss and crosstalk in angularly routed circuit traces.
Innovation Solution
A system and method that includes a resonance estimating system to calculate the floquet frequency by determining the propagation delay and equivalent dielectric constant of circuit traces, allowing for redesign of trace layouts to minimize coupling effects by adjusting routing angles and lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If angular routing is used to mitigate coupling effects, then coupling between stacked routing layers is reduced, but floquet mode coupling occurs causing resonant coupling based on periodicity of angularly routed traces
Solution Approach 1:
The patent changes the geometric parameters of the circuit traces by introducing variable width traces and non-uniform spacing between adjacent traces. This parameter modification breaks the periodicity of angularly routed traces, thereby eliminating floquet mode coupling while maintaining the coupling mitigation benefits of angular routing.
Solution Approach 2:
The patent introduces asymmetry in the trace configuration by making trace widths variable and spacing non-uniform. This asymmetric design disrupts the periodic structure that causes floquet mode coupling, while still utilizing angular routing to reduce coupling effects between broadside stacked layers.
2Adaptability or versatility
If broadside stack-ups are used to increase routing layers, then number of routing layers is increased for the same overall number of layers, but adverse coupling effects occur between stacked routing layers
Solution Approach 1:
The patent modifies trace geometric parameters including width and spacing to optimize coupling characteristics in broadside stack-ups. By carefully controlling these parameters, the patent enables increased routing layer capacity while minimizing adverse coupling effects between stacked layers.
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
The method effectively reduces floquet mode coupling, minimizing insertion loss and crosstalk, thereby improving signal integrity in printed circuit boards with broadside stack-ups.
Implementation Method 1
angular routing can still result in floquet mode coupling, that is, resonant coupling based upon the periodicity of the angularly routed circuit traces
Implementation Method 2
A printed circuit board for an information handling system can utilize broadside stack-ups, with two or more routing layers stacked between the power plane layers
Data Source
AI summary
A method includes providing, on a printed circuit board, a first circuit trace having a first unit cell length and a second circuit trace having a second unit cell length, determining a time delay associated with the first unit cell length and the second unit cell length, estimating a floquet frequency associated with the time delay, where the floquet frequency is determined asffloquet=12tdelay,where ffloquet is the floquet frequency, and tdelay is the time delay, and comparing the estimated floquet frequency with a first interface frequency associated with the first trace.