Abstract
In this paper, a novel meander split power/ground plane is proposed for reducing crosstalk between parallel lines crossing over it. The working mechanism of the meander split scheme is investigated by simulations and measurements. The LC equivalent circuit and transmission line model are developed for modeling interactions between the meander split and the signal lines. The proposed meander structure enhances electromagnetic coupling between split planes. The capacitive coupling across the split ensures signal integrity and magnetic coupling between adjacent finger shaped structures suppresses lateral wave propagation along the split gap, which in turn helps suppress the crosstalk. The effectiveness of the meander split remains valid over very wide frequency ranges (up to 9 GHz). Experimental results show that the proposed structure improves the signal quality and reduces the near/far end crosstalk over 30 dB and 50% in the frequency domain and time domain, respectively.
Highlights
In high-speed electronic systems, the power and ground planes play important roles as a reservoir in supplying power to components and as a voltage reference on printed circuit boards
To reduce the noise coupling due to power planes and provide different power supply voltages, slotted or split plane types are frequently used for the integrated circuits or modules [1,2,3] occupying the same printed circuit boards (PCBs) [4,5]
Power/ground partitioning generates undesired electromagnetic effects such as signal integrity degradation, electromagnetic interference (EMI) and crosstalk when signal lines cross over the split gaps [6,7,8,9,10]
Summary
In high-speed electronic systems, the power and ground planes play important roles as a reservoir in supplying power to components and as a voltage reference on printed circuit boards. The plane pair effectively forms a parallel plate waveguide, which can hold persistent ringing noises generated by routed traces and vias to and from components on the circuit board. Power/ground partitioning generates undesired electromagnetic effects such as signal integrity degradation, electromagnetic interference (EMI) and crosstalk when signal lines cross over the split gaps [6,7,8,9,10]. When two parallel line traces cross over slots or splits in the planes, the crosstalk level between the traces becomes high even for large clearances [11]
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