Analysis Method for Curved Coupled Stripline With Triangular Tabs Within Pin Field of High-Speed Channels

Triangular tabs are a widely adopted method for enhancing signal integrity in routing design. However, traditional numerical tools utilized in the design process are time-consuming and computationally intensive. This paper presents an equationbased approach for quick and accurate calculation of scattering parameters (S-parameters) in curved coupled striplines with facing triangular tabs. The novel electric field compliant geometrical discretization (ECGD) method is explored and applied to derive a precise equation-based model. Both asynchronized and synchronized curved coupled stripline with facing triangular tabs, which are commonly applied in the pin field of the DDR channels, are investigated. Furthermore, the proposed methodology is employed to optimize impedance matching in DDR5 channels. Results demonstrate that this approach yields bathtub curves (derived from touchstone file) with a maximum deviation of 4 % compared to numerical methods (Ansys HFSS), while reducing simulation time by approximately <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$238 x$</tex>. This combination of high accuracy and computational efficiency in calculating S-parameters performance for practical interconnects within the pin field underscores the significant potential of this approach in routing designs for DDR channels with improved signal integrity.