A Branched Reflector Technique to Reduce Crosstalk Between Slot-Crossing Signal Lines

Abstract

A branched reflector technique is proposed to reduce the crosstalk between the signal lines crossing common slotted reference plane. An equivalent circuit model based on lossless transmission lines is applied to characterize the coupling mechanism. The design concept of this approach is well explained and its design method is also provided by utilizing the bounce diagram with multiple discontinuities. According to the experimental results, the reduction of the peak crosstalk is about 51% and it is close to the prediction from the estimated formula. The peak-to-peak crosstalk in our interested region can also be reduced by 68%. The proposed method provides a low-cost and effective solution to suppress the undesirable crosstalk between slot-crossing signal lines.

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“…However, its equivalent series inductance significantly dominates the impedance behavior of the decoupling capacitor, which limits its effectiveness to only below the GHz range. In [103], a circuit model has been recently proposed to explain the crosstalk behavior of the signal lines crossing the slotline. A novel solution by using branched reflector, as shown in Fig.…”

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“…Furthermore, the effectiveness of these approaches is limited in that the equivalent series inductance of the capacitors dominates the impedance of a decoupling capacitor at higher frequencies [22]. Another commonly used approach is the addition a low-Q inductor or a thin inductive trace or stubs [23,24] on split power planes. However, this remedy cannot isolate wideband switching noises generated by each functional block on the same PCB, and cannot accommodate different power supply voltages.…”