Novel Periodic-Aperiodic Routing to Mitigate Floquet Mode Resonances in Crosstalk Transfer Function due to Periodically Routed Structures
Reducing cost in printed circuit board (PCB) layout has pushed designers to use broadside coupled layers to reduce the layer count. The traces are generally routed at an angle in zig-zag fashion to eliminate fiber-weave impact on the insertion loss (THRU) of the channel. If the zig-zag routing is periodic, then it can increase the crosstalk due to Floquet mode resonances. The Floquet resonances aggravate near-end crosstalk (NEXT) and degrade the insertion loss (THRU) profiles. Creating any random structure will not mitigate the Floquet mode resonance. The aperiodic topology created by making the each unitcell different in length did not mitigate the resonances observed in periodic structure but instead created additional resonances in the frequency range of interest. The other challenge for the layout engineers is to route the aperiodic topology that contains different unit cell blocks with different lengths and angles on a real board. In this paper, the proposed solution relies on periodic-Aperiodicity to eliminate these resonances. The topology reuses the unitcell from periodic routing that have same lengths but only vary the spacing between each unitcell to create the aperiodicity. The proposed topology is easy to route as layout engineers can reuse the periodic routing and space them with aperiodic uncoupled segments.
A. R. Chada et al., "Novel Periodic-Aperiodic Routing to Mitigate Floquet Mode Resonances in Crosstalk Transfer Function due to Periodically Routed Structures," Proceedings of the 66th IEEE Electronic Components and Technology Conference (2016, Las Vegas, NV), vol. 2016-August, pp. 2251-2256, Institute of Electrical and Electronics Engineers (IEEE), Aug 2016.
The definitive version is available at https://doi.org/10.1109/ECTC.2016.266
66th IEEE Electronic Components and Technology Conference (2016: May 31-Jun. 3, Las Vegas, NV)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Crosstalk; Insertion losses; Network components; Printed circuit boards; Resonance; Topology; Aperiodicity; Broadside-coupled; Floquet modes; Frequency ranges; Near end cross talks; Periodic routing; Printed circuit boards (PCB); Random structures; Periodic structures; Periodic-Aperiodicity
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Article - Conference proceedings
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01 Aug 2016